Capacitive Coupling Patents (Class 333/24C)
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Patent number: 6133877Abstract: A device for microstrip distribution networks and for group antennas for the suppression of unwanted modes on the distribution network side of a microstrip distribution network. This thereby avoids, among other things, unwanted coupling between antenna elements connected to the microstrip distribution network. A waveguide substructure in principle designed as a U of extruded aluminium, is connected to the microstrip distribution network along two connection lines with at least two electrically-conductive connections to the ground plane of the microstrip distribution network along each connection line. Together with at least part of the ground plane, the waveguide substructure forms a waveguide structure. The waveguide structure is dimensioned so that it has a cut-off frequency that is higher than the highest frequency that is used in the microstrip distribution network.Type: GrantFiled: January 9, 1998Date of Patent: October 17, 2000Assignee: Telefonaktiebolaget LM EricssonInventors: Jonas Sandstedt, Bjorn Johannisson, Goran Snygg
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Patent number: 6107965Abstract: The dual polarized antenna element includes a planar radiating element (2) arranged in a first plane; a metallic surface (4) arranged in a second plane and provided with slots (5,6; 5,6.1,6.2) extending under the radiating element (2); a supply conductor structure (7,8) arranged in a third plane so as to be coupled with the slots (5,6; 5,6.1,6.2) in the second plane, which is located above the third plane. One slot (5) extends on a line of symmetry (11) of the radiating element (2) and the other slot (6; 6.1,6.2) runs perpendicularly to and mirror symmetric to the line of symmetry (11). In order to provide the highest possible decoupling of both polarizations, the other slots (6; 6.1,6.Type: GrantFiled: March 12, 1999Date of Patent: August 22, 2000Assignee: Robert Bosch GmbHInventor: Jochen Christ
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Patent number: 6023202Abstract: A ground return scheme is provided for multiple high speed digital signals that are capacitively coupled between networks, where the networks are connected to different ground planes (i.e. they are isolated) on a common circuit board. A first embodiment of the invention provides a low impedance ground path for each signal crossing the isolation boundary. The ground path is achieved by placing a ground return capacitor proximate to the signal coupled capacitor to substantially minimize the loop area of the total current path. This arrangement substantially minimizes the self inductance of each signal current path and the mutual inductance, i.e. coupling, between signal paths. The arrangement also has the benefit of reducing self-induced voltage drops in each ground return path, thereby reducing crosstalk between the signals, reducing ground bounce (resulting in faster settling times), and also reducing common-mode voltage induced between the grounding systems.Type: GrantFiled: February 13, 1998Date of Patent: February 8, 2000Assignee: Hewlett-Packard CompanyInventor: Gregory A. Hill
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Patent number: 5995821Abstract: A multiple frequency coupler establishes a low noise communication path, through the windshield of a vehicle, from a multiple frequency wireless telephone or multiple single frequency telephones, each operating at a different frequency, in the vehicle to the exterior of the vehicle. The coupler includes two preferably like-shaped internal and external elements that are oriented face to face with each other, with the windshield sandwiched between them. Each element is tapered, and the elements are juxtaposed with each other such that the wider end of one element is generally opposite the narrower end of the other. Also, a multiple frequency radiator is attached to the external element. The radiator includes plural radiating elements that are separated from each other and that are attached to a common base, with each radiating element being configured for radiating a respective frequency.Type: GrantFiled: April 23, 1997Date of Patent: November 30, 1999Assignee: Qualcomm IncorporatedInventor: Allen Minh-Triet Tran
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Patent number: 5977841Abstract: An RF connector comprising a coaxial transmission structure that transmits RF power at RF and microwave frequencies through a dielectric seal. Portions of the connector on either side of the seal do not make metal to metal contact. The connector has input and output connector portions having outer conductors coaxially disposed around inner conductors with dielectric material disposed therebetween. Impedance matching transition portions abut each side of the dielectric seal that have a relatively large diameter adjacent the dielectric seal that transitions to a relatively small diameter distal from the dielectric seal. Tapered and stepped impedance matching transition portions may be employed. A shunt capacitance is disposed approximately one quarter wavelength from each side of the dielectric seal in the stepped transition version. RF energy transmitted by way of the input connector portion is capacitively coupled through the dielectric seal to the output connector portion.Type: GrantFiled: December 20, 1996Date of Patent: November 2, 1999Assignee: Raytheon CompanyInventors: J. J. Lee, Donald Charlton, William L. Lange
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Patent number: 5910755Abstract: A laminate capacitor circuit board which permits constants of various kinds of circuit elements to be set by selectively effected connections between wiring layers, and a laminate capacitor circuit board which permits distributed circuit constants in a high-frequency wiring layer sandwiched between two shielding wiring layers to be set as desired. These circuits are formed with at least a pattern of a conductive foil on each dielectric layer, and include a plurality of wiring layers laminated one upon another, a wiring layer for connections laminated to a surface of the plurality of wiring layers laminated one upon another, a plurality of terminal patterns formed on the wiring layer for connections in a state insulated from each other, a plurality of vias for electrically connecting at least two of the plurality of terminal patterns to corresponding ones of the plurality of wiring layers, and connecting means for selectively connecting the plurality of terminal patterns to each other.Type: GrantFiled: October 28, 1997Date of Patent: June 8, 1999Assignee: Fujitsu LimitedInventors: Hidehiro Mishiro, Kenichiro Tsubone, Mitsunori Abe, Rie Takada
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Patent number: 5892411Abstract: A data transmission device has a first module and a second module moveable relative to one another. One of the modules functions as a sending module and the other functions as a receiving module for transmitting data between first and second modules. One of the modules is an electrical line with a defined surge impedance and the other module is a coupling probe for coupling contact-free with the electrical line. A first sending and receiving electronic circuit is connected to the first module. A second sending and receiving electronic circuit is connected to the second module.Type: GrantFiled: February 15, 1996Date of Patent: April 6, 1999Assignee: Ulrich SchwanInventors: Ulrich Schwan, Andreas Nagel
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Patent number: 5844529Abstract: An enclosed antenna assembly having a non-rigid, floating connection between an aluminum tray and a radome along the length of the assembly. The non-rigid, floating connection along the length of the antenna assembly provides a seal that is not damaged or degraded as a result of thermal expansion and contraction of the dissimilar materials. The tray and radome are joined along their length by a tongue and groove type connection, which allows free movement along the major axis. A top end cap provides the only rigid connection between the tray and the radome. A bottom end cap is fastened only to the radome. The design of the keyway and the top end cap prevent direct water intrusion. The bottom end cap includes weep holes to allow condensation to escape from the interior of the antenna assembly.Type: GrantFiled: April 7, 1997Date of Patent: December 1, 1998Assignee: Electromagnetic Sciences, Inc.Inventors: Thomas Edward Bell, David John Kiesling, Scott Allen Swanburg
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Patent number: 5801600Abstract: A variable differential phase shifter is provided. The device provides a continuous variation in phase between two outputs derived from a single input. The device is suitable for application at signal frequencies around 900 MHz, and is constructed in the form of an inner (38) and outer (37) sleeve capacitively coupled to an inner conductive rod (24) and outer conductive tube (26) respectively, wherein the inner (38), and outer (37) sleeves are connected to an input and can be moved in fixed relative relation thereby varying the phase relationship between the two outputs which are connected to the inner rod (24) and outer tube (26). A dielectric layer (25 and 27) may be provided around the inner rod (24) and outer tube (26). An unequal power division version of the device is provided for by the inclusion of a dielectric tube surrounding a portion of the inner rod.Type: GrantFiled: May 23, 1996Date of Patent: September 1, 1998Assignee: Deltec New Zealand LimitedInventors: Roger John Butland, William Emil Heinz
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Patent number: 5796315Abstract: The present invention is directed to an electrical connector for blocking direct current while permitting transmission of alternating currents. The connector includes a first connector member and a second connector member for matingly receiving the first connector member. The first connector member includes a first conductor and the second connector member having a second conductor. The first and second conductors are positioned adjacent to one another and spaced apart by a layer of dielectric material. The dielectric material provides capacitive coupling of alternating currents from one conductor to the other while preventing coupling of direct current from one to the other. It is an object of the present invention to provide an improved electrical connector with an integral dielectric coating for direct current blockage.Type: GrantFiled: July 1, 1996Date of Patent: August 18, 1998Assignee: Tracor Aerospace Electronic Systems, Inc.Inventors: Robert B. Gordon, Robert C. Doak, James L. Shields
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Patent number: 5757246Abstract: A method and apparatus for suppressing the generation of passive intermodulation within passive devices. A dielectric sheet comprising dielectric material is placed between first and second conductive elements of the passive device. The second conductive element is then mounted to the first conductive element, thereby "sandwiching" the dielectric sheet between the first and second conductive elements. In this manner, a direct contact connection can not be formed at the junction of the first conductive element and the second conductive element. This absence of a continuous direct contact minimizes the opportunity for passive intermodulation products to be generated at this junction of the passive device.Type: GrantFiled: February 27, 1995Date of Patent: May 26, 1998Assignee: EMS Technologies, Inc.Inventor: Eric Norman Johnson
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Patent number: 5742255Abstract: An antenna assembly (10) for use in combination with a glass window (60) and a signal transmission line (110) carrying a electrical transmission signal (S) with a first connector (C) at one end and having a preselected electrical impedance is disclosed. The assembly (10) includes a conductive plate (70) secured to the window (60) and a radiating antenna (80) connected to the plate (70). A ground plane (40) with an aperture (50) therein is secured to the window (60). A feed substrate (30) is connected to the ground plane (40). A microstrip feedline (20) and a second connector (120) attached thereto are connected to the feed substrate (30). The microstrip feedline (20) has an electrical impedance approximately equal to the preselected electrical impedance.Type: GrantFiled: October 28, 1996Date of Patent: April 21, 1998Assignee: Maxrad, Inc.Inventor: George D. Afendras
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Patent number: 5726608Abstract: The invention provides a trimmable multi-terminal capacitor. The multi-terminal capacitor comprises a plurality of capacitors with each of the capacitors having a common terminal. The capacitors are formed on a layer of dielectric material having a common plate of conductive material disposed on its top surface, and a plurality of separate plates of conductive material disposed on its lower surface. The capacitance value of each of the capacitors is separately tunable to tight tolerances. The capacitor is particularly suited to be used in a voltage controlled oscillator (VCO) to couple a plurality of devices to a resonator.Type: GrantFiled: October 17, 1995Date of Patent: March 10, 1998Assignee: Telefonaktiebolaget LM EricssonInventor: Michael .ANG.rlin
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Patent number: 5668514Abstract: A signal transmission device includes a first body made of electromagnetic shielding material and fixed to a rotary shaft which passes through the first body. The first body revolves together with the rotary shaft around an axis of the rotary shaft. A second body made of electromagnetic shielding material is stationarily disposed around the rotary shaft. A first conductive element is spirally formed on a first substrate in a manner that peak magnitude points of traveling wave component of transmission signal generated on the element are positioned out of alignment with each other between the neighboring turns of the spiral element in radial direction of the spirally formed element. The first conductive element is disposed in the first body. A second conductive element is formed on a second substrate and has a first width enough to cover the first conductive element in the radial direction and a second width in a direction perpendicular to the radial direction.Type: GrantFiled: October 12, 1994Date of Patent: September 16, 1997Assignee: Dai Nippon Printing Co., Ltd.Inventors: Masaru Hoshino, Toyokazu Sano, Takeo Oe
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Patent number: 5646582Abstract: The present invention is intended to prevent an unnecessary standing wave from being generated by simplifying a circuit in a transmission line switch to be used in a block-down converter for receiving, for example, satellite broadcasting. First and second amplifiers are adapted to be selectively switchable to an ON state to/from an OFF state and are arranged in first and second input lines and are respectively provided with a connection line for connecting the first and second input lines and a common output line. The connection line comprises a first transmission line 3 connected to an end part of the first input line, a second transmission line connected to an end part of the second input line and a third transmission line connected to an end part of the common output line. The first to third transmission lines are arranged in parallel to one another to transmit signals and form a DC block circuit adapted to selectively shut down a DC bias to the amplifiers.Type: GrantFiled: October 23, 1995Date of Patent: July 8, 1997Assignee: Sony CorporationInventor: Kenichi Kawasaki
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Patent number: 5583525Abstract: A capacitive coupling arrangement including a plate-shaped input/output terminal of a signal line and a plate-shaped input/output terminal of a price display unit. These input/output terminals are connected together separated by a small gap and the respective input/output terminals are capacitively coupled. Amplifiers are connected to the input/output terminals as necessary to amplify the signal being transmitted across the capacitive coupling.Type: GrantFiled: May 28, 1996Date of Patent: December 10, 1996Assignee: NCR CorporationInventors: Yoshihiko Nekomoto, Yoshitaka Utsumi
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Patent number: 5565877Abstract: An improved glass mount antenna system employs a pair of coupling plates having planar cavities disposed therein with any ground plane portion thereof. Surfaces of the coupling plates which are opposite that of the ground plane include a printed exciter strip which crosses the planar cavities to thereby provide an effective communications antenna assembly which is inexpensive to manufacture and especially well suited for high frequency communication operations such as the ultra-high frequency microwave bands of between 1.5 GHz and about 2.4 GHz which are currently intended for PCN/PCS communications.Type: GrantFiled: September 11, 1995Date of Patent: October 15, 1996Assignee: Andrew CorporationInventors: Xin Du, Joseph F. Mockus
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Patent number: 5543386Abstract: A joint device structure for capacitive microwave coupling of a superconducting device arranged on a substrate with room temperature circuitry; including a superconducting wave guide of an oxide superconductor on said substrate from one side to the superconducting device launching microwave to the superconducting device, a pair of superconducting groundplanes of an oxide superconductor arranged at an end of the superconducting wave guide sandwiching the end of the superconducting wave guide with a little gap and a microwave probe-head connected to the room temperature circuitry arranged above the superconducting wave guide with a coupling gap having three probing pins corresponding to the superconducting wave guide and the superconducting groundplanes.Type: GrantFiled: February 28, 1994Date of Patent: August 6, 1996Assignees: Sumitomo Electric Industries, Ltd., University of MarylandInventors: Alp T. Findikoglu, Takao Nakamura
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Patent number: 5532658Abstract: An electronic component which is employed in the frequency range in the microwave band or above is mounted on a circuit board. The circuit board comprises two linear transmission line members, a ground electrode, and an electric insulating substrate provided with the transmission line members and the ground electrode on its major surface. The electronic component comprises external electrodes which are formed on its side surfaces. Holding patches which are formed on the lower surface of the electronic component are bonded to the ground electrode by solder members, thereby fixing the electronic component to the circuit board. At this time, small clearances are defined between the electronic component and the circuit board through the solder members, whereby the external electrodes are electromagnetically coupled with the transmission line members and the ground electrode through the clearances respectively.Type: GrantFiled: December 22, 1994Date of Patent: July 2, 1996Assignee: Murata Manufacturing Co., Ltd.Inventors: Ken Tonegawa, Harufumi Mandai, Teruhisa Tsuru, Mitsuhide Katou, Koji Furutani
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Patent number: 5475351Abstract: A non-contact rotating coupler for transmitting a signal through coupling capacitances formed between opposite coupling plates arranged apart from each other. In the coupling plate, an inductance for causing a parallel resonance in a signal frequency band with a stray capacity existing between a grounded conductor and a non-grounded conductor is connected between a junction point of a resistor and a capacitor and the grounded conductor or between the non-grounded conductor and the grounded conductor, thereby reducing a coupling loss.Type: GrantFiled: September 26, 1994Date of Patent: December 12, 1995Assignees: Nippon Steel Corporation, Systems Uniques CorporationInventors: Masahiro Uematsu, Takashi Ojima, Kazuo Kato
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Patent number: 5463405Abstract: A cellular telephone coupling network (12) includes a generally rigid dielectric substrate (50) having a pair of tuning stubs (64, 66) formed thereon by confronting thin conductive strips (68, 70) and (72, 74) positioned on opposite face surfaces (60, 62) of the substrate (50). A unique conductive strip pattern is provided for the coupling network (12) which permits broad tunability while allowing the coupling network to be fit within the confines of a small plastic housing (32). To this end, the stubs (64, 66) are shaped as generally open, rectangular loops comprising a series of straight leg sections (94, 96, 102, 106) connected end to end around the edges of the substrate (50) with the stub distal ends (108, 112) heading back toward the respective stub proximal ends (92, 110) but stopping short thereof. One of the stubs includes an extension leg section (114) to make it longer than the other stub for greater tunability.Type: GrantFiled: May 20, 1994Date of Patent: October 31, 1995Assignee: Valor Enterprises, Inc.Inventors: Duixian Liu, Glenn L. Cota
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Patent number: 5451966Abstract: An improved glass mount antenna system employs a pair of coupling plates having planar cavities disposed therein with any ground plane portion thereof. Surfaces of the coupling plates which are opposite that of the ground plane include a printed exciter strip which crosses the planar cavities to thereby provide an effective communications antenna assembly which is inexpensive to manufacture and especially well suited for high frequency communication operations such as the ultra-high frequency microwave bands of between 1.5 GHz and about 2.4 GHz which are currently intended for PCN/PCS communications.Type: GrantFiled: September 23, 1994Date of Patent: September 19, 1995Assignee: The Antenna CompanyInventors: Xin Du, Joseph F. Mockus
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Patent number: 5412356Abstract: A single-ended digital interface cable and a balanced digital interface cable having a source end and a load end for propagating audio frequency signals in a digital format is disclosed. Each of the cables comprises a fixed capacitor or a capacitor and switch network which is coupled at or near the load end of the cables for providing a fixed bandwidth or for use in selectively controlling the bandwidth of the cables and a series resistance at each end thereof to dampen ringing.Type: GrantFiled: October 26, 1992Date of Patent: May 2, 1995Assignee: Constant Velocity Transmission Lines, Inc.Inventors: Richard N. Marsh, Bruce A. Brisson
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Patent number: 5397994Abstract: A particulate moisture measurement gauge of the type using a resonant electric circuit connected to a diode detector and to an AC signal generator having a frequency near the resonant frequency of the resonant circuit and in which the resonant circuit is electrically coupled to the particulate by a capacitor having the particulate as its dielectric. A probe is formed as a transmission line having a length which is approximately an integral number of one quarter wave lengths long. One end of the transmission line is connected to the circuitry and its opposite, moisture sensing end is immersed in the particulate. Preferably the probe is a rigid, conductive tube with a central rod having a ceramic insulator sealing its moisture sensing end and the circuitry housed in its opposite end.Type: GrantFiled: December 28, 1993Date of Patent: March 14, 1995Assignee: Alkon CorporationInventor: Robert W. Phare
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Patent number: 5386196Abstract: A system (10) accurately measures the resistivity of a material (12) via capacitive coupling without contact with the material (12). A transmission electrode (14a) sends signals through the material (12) to a reception electrode (14b). An oscillation mechanism (16) forwards a periodic signal at a predetermined frequency f to the electrode (14a), and a detection mechanism (18) receives a resistivity signal from the electrode (14b), which signal is proportional to the resistivity of the material (12), and translates the resistivity signal into a resistivity value for the material (12). The oscillation mechanism (16) comprises an oscillator (21) connected through a transformer (T1) to a quarter-wavelength stub (24), which feeds an excitation signal to the transmission electrode (14a). The detection mechanism (18) comprises a detector (31) connected via a transformer (T2) to a quarter-wavelength stub (26), which is directly connected to the reception electrode (14b).Type: GrantFiled: August 23, 1993Date of Patent: January 31, 1995Assignee: Denmar, Inc.Inventors: Dennis R. Jones, James E. Lutz, Richard H. Campbell, Denys D. Overholser
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Patent number: 5338950Abstract: A capacitor element for an integrated circuit comprises a thin layer of dielectric material laminarly disposed between first and second layers of electrically conductive material. Each of the layers has n sides, where n is an even intergergreater than four. Preferably, each layer of the capacitor, and therefore the capacitor itself, is shaped as an equiangular polygon. Although, the capacitor may be configured as a hexagon, a decagon, etc., an octagonal configuration is preferred. By eliminating the 90 feed bend, substantial reductions in discontinuity reactances are obtained.The capacitor element may be provided as an element of a hybrid or a monolithic circuit. When the capacitor element is employed as an element of a microwave circuit, the first conductive layer is deposited on a substrate of a semi-insulating material such as gallium arsenide.Type: GrantFiled: August 23, 1993Date of Patent: August 16, 1994Assignee: ITT CorporationInventor: Inder J. Bahl
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Patent number: 5309122Abstract: A multiple-layer microstrip assembly having an inter-layer connection for transitioning electrical signals between analogous surfaces of separate layers, comprising a plurality of layers, each having a top surface and a bottom surface; first top circuitry disposed on the first top surface of a first layer; first bottom circuitry disposed on the first bottom surface of the first layer; connecting means for electrically connecting the first top circuitry to the first bottom circuitry; second top circuitry disposed on the second top surface of a second layer; and binding means to hold the two layers together, wherein the first bottom circuitry is sufficiently adjacent and overlapping the second top circuitry to form an electrical connection therebetween, thereby forming a signal transition between the first top surface of the first layer and the second top surface of the second layer.Type: GrantFiled: October 28, 1992Date of Patent: May 3, 1994Assignee: Ball CorporationInventors: Brian J. Cox, Russell W. Johnson, Patrick Westfeldt, Jr.
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Patent number: 5276415Abstract: A compact selectable AC/DC coaxial coupling having a cylindrical signal coupling capacitor disposed within a section of coaxial transmission line. Inner and outer plates of the capacitor are electrically connected to an external connector and the center conductor of the transmission line, respectively. A radially biased conductive collet or a conductive mesh axially disposed on the center conductor is biased into and out of contact with the inner plate of the capacitor to enable or disable DC coupling. Alternatively, a resilient contact member is displaced through an externally accessible actuating rod to connect the center conductor to the inner plate of the capacitor. The integral nature of these switching mechanisms within a coaxial environment provides both low insertion losses and continuous impedance matching.Type: GrantFiled: June 18, 1992Date of Patent: January 4, 1994Inventors: Robert J. Lewandowski, Daniel G. Dow, Frederick J. Telewski
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Patent number: 5212462Abstract: The present invention relates to a stripline microwave module comprising: at least one first line situated in a first plane; at least one second line; and at least one coupling opening situated in a second plane so as to enable transmission to take place between the two lines. The invention is particularly suitable for space applications.Type: GrantFiled: July 3, 1991Date of Patent: May 18, 1993Assignee: Alcatel EspaceInventors: Michel Gomez-Henry, Michel Salvan, Michel Lairle, Gerard Raguenet
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Patent number: 5191303Abstract: A high speed probe attenuator has an attenuator with a plurality of resistors connected in series between a probe input and an instrument output. A plurality of capacitors are coupled in parallel with pairs of the resistors in an interleaved fashion to spread the frequency correction along the attenuator. The output of the attenuator is coupled by a large diameter coaxial cable to a test instrument. The result is a high speed probe with no dribble-up effect and no overshoot.Type: GrantFiled: September 10, 1991Date of Patent: March 2, 1993Assignee: Tektronix, Inc.Inventors: Matthew A. Porter, Dale A. Ellenwood
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Patent number: 5120705Abstract: A transmission line using superconductors instead of conventional conductors substantially reduces ohmic losses compared to conventional conductors. The superconductors are cooled by refrigerant flowing through a hollow superconducting inner conductor. The refrigerant is transported to the inner conductor using a novel connector.Type: GrantFiled: August 22, 1990Date of Patent: June 9, 1992Assignee: Motorola, Inc.Inventors: Allen L. Davidson, Marc K. Chason
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Patent number: 5105201Abstract: A glass mounted antenna for car radio including an antenna element having a length that is in a resonant or non-resonant state with respect to FM frequencies, resonance circuits made up with spiral coils and capacitors so as to resonate in the FM band, a band-pass filter that passes only FM signals and no AM signals, and an AM impedance converter having an active element converting high-impedance signals into low impedance signals.Type: GrantFiled: June 26, 1990Date of Patent: April 14, 1992Assignee: Harada Kogyo Kabushiki KaishaInventors: Kazuhiko Nakase, Moriyoshi Kawasaki
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Patent number: 5084864Abstract: A broadband, inductively coupled, duplex, radio frequency (RF) transmission system for communcating between a central unit (10) and a plurality of remote units (31) is disclosed. The central unit (10) includes an RF signal source (11) and an RF receiver (21) connected to one end of a balanced transmission line (25) via a signal splitter (15) and a transmission line impedance matching network (27). Each remote unit (31) includes a receiving section (33) and a transmitting section (35) separate from one another. Each receiving section (33) and each transmitting section (35) includes U-shaped couplers (37,43) positioned so as to overlie the balanced transmission line (25). The U-shaped couplers (37,43) are oriented such that the cross-members of the U-shaped couplers (37,43) lie orthogonal to the balanced transmission line (25) and the legs of the U-shaped couplers (37,43) lie parallel to the balanced transmission line (25).Type: GrantFiled: May 14, 1990Date of Patent: January 28, 1992Assignee: The Boeing CompanyInventors: Thomas H. Turnbull, James B. Turner
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Patent number: 5083136Abstract: A transmission line coupling device comprising a pair of coils each having an electrical length of one half of the wave length of transmitted frequency. Respective ends of the coils are connected together to give a full wave loop. The outside shielding of the transmission cable is connected to one end of the coils so that the coils have generally ground potential at their ends. The midpoint of the coils have maximum voltage, and the center conductor of the transmission line is connected to a point on one coil having an impedance matching that of the transmission line. The other coil is capacitively coupled in some fashion to the antenna.Type: GrantFiled: November 16, 1989Date of Patent: January 21, 1992Inventor: Donald H. Wells
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Patent number: 5073761Abstract: A radio frequency coupler connector includes a housing having first and second housing portions. The first housing portion includes a first open-ended launcher operatively connected to a first connection terminal, and the second housing portion includes a second open-ended launcher operatively connected to a second connection terminal. When the first and second housing portions are assembled, the first and second open-ended launchers are overlapped and separated by a dielectric, thereby providing a non-contact connection by capacitive coupling.Type: GrantFiled: June 5, 1990Date of Patent: December 17, 1991Assignee: Westinghouse Electric Corp.Inventors: Timothy G. Waterman, Jimmy W. Mullis, John H. Staehlin
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Patent number: 5072198Abstract: A coaxial transmission line system includes a coaxial transmission line having a center conductor and an outer conductor, and an rf generator. A stub antenna is coupled to the generator, and extends radially into the transmission line between the outer and center conductors for capacitively coupling rf energy from the generator to the center conductor. Input impedance of the coaxial transmission line is matched to the impedance of the antenna and generator by means of a pair of tuning screws that extend radially into the transmission line between the outer and center conductors adjacent to the antenna. The tuning screws are adjustably positionable radially of the center conductor and are spaced from each other lengthwise of the transmission line.Type: GrantFiled: November 6, 1990Date of Patent: December 10, 1991Assignee: Vickers, IncorporatedInventors: Lael B. Taplin, Calman S. Sagady
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Patent number: 5057847Abstract: An RF connector for connecting a radiotelephone (1) to an external antenna, whereby the telephone and a corresponding device rack (2) are connected to the external antenna by two pairs of matching metal plates (1a, 2a, 1b, 2b) that provide a capacitive two-wire connector-interface. In order to avoid too large a size and too high an attenuation, a coil (3a, 3b) is connected in series with the pair of plates (1a, 2a; 1b, 2b) constituting each capacitor. The coil and capacitor are dimensioned so that they form a resonant circuit with an attenuation of nearly 0 at the desired transmission frequency. A first balancing transformer (4) before the resonant circuit transforms the signal into a balanced signal, and a second balancing transformer (5) after the resonant circuit transforms the signal back to an unbalanced signal to be transmitted further on a coaxial cable.Type: GrantFiled: May 22, 1990Date of Patent: October 15, 1991Assignee: Nokia Mobile Phones Ltd.Inventor: Risto Vaisanen
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Patent number: 4999642Abstract: A transformer or coupling device having differing impedances and comprising a pair of conductors each constructed and arranged to have a standing wave in one which is a mirror image of the standing wave in the other so that the impedance varies from near zero at one end of the conductors to a maximum near their center. The transformer having an impedance matching that of one device to be coupled and having output terminals connected to points on the other conductor having an impedance matching that of the other device to be coupled.Type: GrantFiled: May 5, 1989Date of Patent: March 12, 1991Inventor: Donald H. Wells
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Patent number: 4987391Abstract: A coaxial cable isolator is presented which serves to reduce or eliminate ground loop induced hum and interference in audio-video entertainment systems connected to externally grounded antenna signal sources. A linearly arranged array of discrete monolithic capacitive elements couples two ground plane areas fabricated on a circuit board, which are connected respectively to the shield conductors of the input and output coaxial cables between which DC and audio frequency isolation is desired. Resistive elements are provided for the dissipation of accumulated static charges, and a gas discharge transient suppressor protects equipment connected to the isolator's output from voltages induced by nearby lightning strikes.Type: GrantFiled: March 14, 1990Date of Patent: January 22, 1991Inventor: Michael Kusiak, Jr.
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Patent number: 4972505Abstract: A distributed radio antenna system for extending radio communications into confined regions into which external radio signals do not penetrate, the system having separate transmitting (TX) and receiving (Rx) antenna systems. Each Tx or Rx system has an elongated low loss coaxial cable system (18 or 31) and a plurality of antennas (23 or 28) connected to each of the individual segments of the cable system at spaced distances along the length of the cable segment. The antennas are coupled to the cable segments by signal taps (21 or 21') having adjustable or preselected values of attenuation so that the power fed to each TX antenna (23) from the Tx cable system (18) is approximately the same and so that the attenuation of the signals received from each Rx antenna (28) is approximately the same, thereby conserving power and reducing system cost.Type: GrantFiled: December 6, 1988Date of Patent: November 20, 1990Inventor: Reuben A. Isberg
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Patent number: 4952916Abstract: An electrohydraulic control system includes an actuator having a cylinder and a piston variably positionable therewithin. An electrohydraulic valve is responsive to valve control signals for coupling the actuator to a source of hydraulic fluid. A coaxial transmission line extends through the actuator, and includes an outer conductor formed by the actuator cylinder and a center conductor operatively coupled to the piston such that length of the coaxial transmission line is effectively directly determined by position of the piston within the cylinder. An rf generator is coupled by an antenna to the coaxial transmission line for launching rf energy therewithin, and valve control electronics is responsive to rf energy reflected by the coaxial transmission line for indicating position of the piston within the cylinder and generating electronic control signals to the valve.Type: GrantFiled: December 4, 1989Date of Patent: August 28, 1990Assignee: Vickers, IncorporatedInventor: Lael B. Taplin
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Patent number: 4949001Abstract: A method and device for detecting a partial discharge pulse in a high voltage conductor in the stator of a motor, turbine generator or the like, comprising a conductive plate having an insulated face, an insulated signal conductor spanning the insulated face of the plate, and means for transmitting an electrical pulse produced in the signal conductor to recording means for determining the location and severity of partial discharge activity within the high voltage insulation of the conductor.Type: GrantFiled: July 21, 1989Date of Patent: August 14, 1990Inventor: Steven R. Campbell
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Patent number: 4908585Abstract: An RF transformer employs at least three elongated conductive elements in generally parallel spaced relationship. At least a first inductive element is connected between a pair of the conductive elements to provide a desired field distribution. A diagnostic technique for determining the frequency shift of the transformer employs a perturbing object which is selectively longitudinally positioned within the transformer. The transformer has particular utility as an RF excited gas laser.Type: GrantFiled: February 27, 1989Date of Patent: March 13, 1990Inventor: Peter P. Chenausky
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Patent number: 4877999Abstract: The invention concerns a method and apparatus to produce a noble-gas plasma for excitation in optical emission spectrometry. The apparatus includes an hf generator feeding an oscillation circuit consisting of at least one inductor and one capacitor. The capcitor includes at least two capacitor plates which are so shaped and mutually arranged that they enclose a cavity in which the plasma may form.Type: GrantFiled: April 7, 1988Date of Patent: October 31, 1989Assignee: Anton Paar KGInventors: Gunter Knapp, Andreas Schalk
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Patent number: 4814729Abstract: A microstrip IMPATT circuit tuning mechanism for use with RF producing IMPATT diode combinations including a microstrip circuit board and a external load line connected by a coupling spring attached to the load line and separated from the microstrip circuit by a dielectric layer, the coupling spring being manipulated by a dielectric screw inserted through the housing containing the microstrip board and further having a metallic frequency controlling screw extending through the housing and terminating before the microstrip board.Type: GrantFiled: December 9, 1987Date of Patent: March 21, 1989Assignee: Rockwell International CorporationInventor: Robert A. Becker
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Patent number: 4810933Abstract: The present invention relates to a device for generating plasma (ionizing gas) by a propagating surface wave. The device comprises a wave launching structure mounted on a plasma vessel and connected to an impedance matching network. The latter comprises a coupler and a tuner which is either formed by a section of a transmission line or is of the lumped circuitry type. The launching structure may either generate an azimuthally symmetric or a non symmetric propagating wave. This invention also relates to a method and a device for shaping plasma which comprises a plasma vessel receiving a surface wave generator and having a serviceable portion of a size and/or shape substantially different from the shape and/or size of the portion of the plasma vessel receiving the wave generator.Type: GrantFiled: July 2, 1986Date of Patent: March 7, 1989Assignee: Universite de MontrealInventors: Michel Moisan, Zenon Zakrzewski
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Patent number: 4809284Abstract: An RF transformer employs at least three elongated conductive elements in generally parallel spaced relationship. At least a first inductive element is connected between a pair of the conductive elements to provide a desired field distribution. A diagnostic technique for determining the frequency shift of the transformer employs a perturbing object which is selectively longitudinally positioned within the transformer. The transformer has particular utility as an RF excited gas laser.Type: GrantFiled: March 22, 1988Date of Patent: February 28, 1989Inventor: Peter P. Chenausky
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Patent number: 4800343Abstract: A DC cutting circuit for passing a signal having a selected wavelength from input side circuitry to output side circuitry while cutting from said signal any DC component therein, which includes a resonator electrode having an electrical length of 1/4 wavelength and formed at a forward open end of a strip line connected to an input side circuitry, and another resonator electrode also having an electrical length of 1/4 wavelength and formed at a forward open end of a strip line connected to an output side circuitry, with said resonator electrodes being disposed in a parallel spaced relation to each other so as to couple the input side circuitry with the output side circuitry by the two resonator electrodes.Type: GrantFiled: May 7, 1987Date of Patent: January 24, 1989Assignee: Murata Manufacturing Co., Ltd.Inventor: Humiaki Kinoshita
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Patent number: 4792725Abstract: A system for instantaneously ionizing and continuously delivering energy in the form of surface waves to a low pressure gas or mixture of low pressure gases, comprising a source of rf energy, a discharge container, (such as a fluorescent lamp discharge tube), an rf shield, and a coupling device responsive to rf energy from the source to couple rf energy directly and efficiently to the gas or mixture of gases to ionize at least a portion of the gas or gases and to provide energy to the gas or gases in the form of surface waves. The majority of the rf power is transferred to the gas or gases near the inner surface of the discharge container to efficiently transfer rf energy as excitation energy for at least one of the gases. The most important use of the invention is to provide more efficient fluorescent and/or ultraviolet lamps.Type: GrantFiled: December 10, 1985Date of Patent: December 20, 1988Assignee: The United States of America as represented by the Department of EnergyInventors: Donald J. Levy, Samuel M. Berman
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Patent number: 4700152Abstract: A non-contacting type of high frequency signal coupling arrangement for coupling RF signals to a television receiver at one or more workstations for alignment or test includes a first transmission line mounted a the workstation and coupled to the RF signal source and a second transmission line mounted on the pallate for moving the television receiver from one workstation to another and coupled to the antenna input of the television receiver. At a workstation, the two transmission lines are brought into overlying relationship so that the RF signals are capacitively coupled from the first transmission line to the second.Type: GrantFiled: July 29, 1985Date of Patent: October 13, 1987Assignee: RCA CorporationInventor: Robert M. Wilson