Patents Examined by Paul L. Gensler
  • Patent number: 4465990
    Abstract: A microwave detector arrangement operable over a broad range of frequencies including the series resonant frequency of a detector diode (9) for detecting microwave energy in a transmission line of characteristic impedance Z.sub.o, suitably a coplanar line. A first portion of line, including a strip conductor (3), is terminated by a network, including a capacitance (4) and a first resistance (5) in series with one another and with the parallel combination of a second resistance (6) and the diode (9). The capacitance (4) provides D.C. isolation, while the detector output is taken across a capacitance (10) in series with the diode (9). The first and second resistances (5,6) are respectively 2Z.sub.o /3 and 3Z.sub.o /2, so that the terminating impedance provides a reasonable match to the line over a broad frequency range.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: August 14, 1984
    Assignee: U.S. Philips Corporation
    Inventor: Peter J. Gibson
  • Patent number: 4463330
    Abstract: A dielectric waveguide consists of dielectric strips sandwiched between two parallel conductive plates whose inner surfaces are covered with thin dielectric layers. The other space of the waveguide is filled with an appropriate dielectric medium which can be air or any other low loss dielectric material whose dielectric constant is smaller than that of the dielectric strips. In this waveguide, radiated waves which might be generated at the curved sections and any other discontinuities of the dielectric strips can almost completely be suppressed due to the cutoff property of the conductive plates, if the electric field of electromagnetic waves to be transmitted is polarized primarily parallel to the conductive plates and relevant parameters of the waveguide are chosen to satisfy the following inequality: ##STR1## where .epsilon..sub.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: July 31, 1984
    Assignee: Seki & Company, Ltd.
    Inventor: Tsukasa Yoneyama
  • Patent number: 4463324
    Abstract: A miniature coaxial transmission line to waveguide transition particularly useful for frequencies beyond 40 GHz utilizes a projecting center conductor of a miniature coaxial line inserted directly into a waveguide. A metallic cylindrical sleeve is affixed to the end of the projecting center conductor to form a probe. The coaxial line is housed in the waveguide flange, and a plate is affixed across the cross section of the waveguide to provide a short circuit.
    Type: Grant
    Filed: June 3, 1982
    Date of Patent: July 31, 1984
    Assignee: Sperry Corporation
    Inventor: John C. Rolfs
  • Patent number: 4463328
    Abstract: A capacitively shortened coaxial resonator for making nuclear magnetic resonance measurements includes inner and outer concentrically arranged metal cylinders. The cylinders define therebetween a sample region and are shorted electrically by a conductive cap which closes one end of the inner and outer cylinders. A capacitor is connected across the cylinders at the opposite open end and functions to resonate with the inductance of a coaxial conductor formed by the short circuited cylinders. Samples placed in the sample region are mounted on an air bearing and rotated by means of air holes formed in the inner and outer cylinders.
    Type: Grant
    Filed: May 17, 1982
    Date of Patent: July 31, 1984
    Assignee: University of South Carolina
    Inventor: F. David Doty
  • Patent number: 4463326
    Abstract: A microwave combiner/divider circuit instrumented in stripline medium and therefore planar in form. Circuit traces are produced by etching of a standard microwave printed circuit board having a conductive ground plane or base plate and a layer of low-loss insulation over which a copper layer is provided. A common signal port feeds a division point through a capacitive stub and a two-stage, ring-type impedance matching circuit. The multiple circuit traces emanating from the division point are arranged so that N individual branch ports are connected thereto. The stripline circuitry between the division point and the branch ports provide compensation for phase reversal. Resistors for branch port isolation connected within the stripline circuitry such that for equal loads or equal power sources connected to the branch ports (divider or combiner applications, respectively) zero currents flow in these resistors and they are therefore not required to provide a large power dissipating capability.
    Type: Grant
    Filed: December 2, 1981
    Date of Patent: July 31, 1984
    Assignee: International Telephone and Telegraph Corporation
    Inventor: Harvey K. Hom
  • Patent number: 4463325
    Abstract: A coaxial microwave divider network employing a quarter wavelength long grounded stub for providing support for the center conductor of the divider and also providing improved heat dissipation of the center conductor. Also, this form of stub support permits the center conductor to be supported without a dielectric thereby reducing the insertion loss. Consequently, improved CW power handling performance is possible in comparison with prior designs. Moreover, with the proper choice of the stub admittance level, the input VSWR can also be improved in comparison with a design which employs multi-section matching transformers only at the input.
    Type: Grant
    Filed: August 17, 1982
    Date of Patent: July 31, 1984
    Inventors: Gordon P. Riblet, Henry G. Riblet
  • Patent number: 4463323
    Abstract: A woven electrical transmission cable A is illustrated which includes a plurality of warp elements (12, 12, 14) interwoven with a weft element (16). A number of the warp elements are ground conductors (10) and a number are signal conductors (12). The ground and signal conductors are arranged in clusters (D, E) which include signal conductor pairs (12a, 12b and 12c, 12d) isolated by ground conductors (10a-10c and 10d-10f), respectively. An input signal is split at the input (20, 24) of the cluster between the signal conductor pair which is then combined at the output to provide a single output signal (28, 30). The location of the ground conductors relative to the signal conductors is fixed in the cable by interweaving of the weft (16) and warp binder yarns (14) together with the warp conductors (10, 12) whereby the characteristic impedance is controlled.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: July 31, 1984
    Assignee: Woven Electronics Corporation
    Inventor: Douglas E. Piper
  • Patent number: 4462008
    Abstract: In a noise reduction circuit comprising a combining circuit which generates a combined signal in response to signals supplied thereto, a main channel which supplies an information signal substantially unchanged to the combining circuit, and an auxiliary channel which receives the information signal and which supplies a modified information signal to the combining circuit for combining with the unchanged information signal, the auxiliary channel includes a high pass filter with a variable cut-off frequency which generates a filtered output signal in response to the information signal supplied thereto, a voltage-current converting circuit which converts the voltage level of the filtered output signal to a current and which supplies the current to the combining circuit, and an amplitude limiting circuit which limits the amplitude of the current supplied to the combining circuit.
    Type: Grant
    Filed: December 20, 1982
    Date of Patent: July 24, 1984
    Assignee: Sony Corporation
    Inventor: Masayuki Katakura
  • Patent number: 4462010
    Abstract: A signal splitter-balun assembly for coupling a UHF antenna and a VHF antenna to a single input terminal of a television receiver is disclosed. RF isolation is provided by means of appropriate filtering, 60 Hz isolation is provided by means by a pair of capristors, and the required impedance transformation is provided by means of a conventional balun transformer in a low cost unit utilizing a minimum number of components.
    Type: Grant
    Filed: January 6, 1983
    Date of Patent: July 24, 1984
    Assignee: Zenith Electronics Corporation
    Inventor: Peter Strammello
  • Patent number: 4462009
    Abstract: A method and apparatus is disclosed for automatically and exactly tuning a boradband filter. Upon the detection of a tuning change, the filter is automatically switched end to end so that the output terminal of the filter is connected to the radio frequency power source. Radio frequency in this application refers to any signals whose frequency facilitates propagation of data via electromagnetic waves. The input terminal is terminated into a known load such as 50 ohms and C1, an input variable reactance is adjusted until a 90.degree. phase relationship exists between the input resonator and the output resonator's node voltages. These actions set the exact tune condition for the broadband filter.
    Type: Grant
    Filed: May 25, 1982
    Date of Patent: July 24, 1984
    Assignee: Rockwell International Corporation
    Inventors: Harvey L. Landt, Glenn R. Snider
  • Patent number: 4460879
    Abstract: An input signal is supplied to a first port of a non-reversible circuit and those frequency components of the input signal applied to a second port of the non-reversible circuit which differ from the resonance frequency of a resonance element connected to the second port are absorbed by a resistive terminating element connected to the second port. On the other hand, a frequency component of the input signal which coincides with the resonance frequency is derived at the third port of the non-reversible circuit. By changing the resonance frequency of the resonance element, the frequency component of the input signal which are provided to the third port can be altered.
    Type: Grant
    Filed: December 4, 1981
    Date of Patent: July 17, 1984
    Assignee: Takeda Riken Kogyo Kabushiki Kaisha
    Inventor: Masaaki Hirose
  • Patent number: 4460877
    Abstract: A TEM mode balun in a single-level microwave circuit in a transmission line medium selected from among the stripline, microstrip, airstrip, etc. media. The device employs coupled-strip all-pass filter elements to provide a pair of balanced input/output lines in 180.degree. phase relationship and an unbalanced line port.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: July 17, 1984
    Assignee: International Telephone and Telegraph Corporation
    Inventor: William G. Sterns
  • Patent number: 4460880
    Abstract: The invention provides circuit matching elements primarily for integrated circuits and particularly for monolithic microwave integrated circuits.A transmission line in accordance with the invention is provided with a thin metallic film deposition disposed in the signal propagation path. The effect of the film is to increase the specific capacitance of the line without decreasing the specific inductance. The result is a slowing down and therefore a decrease of the wavelength of signals in the line.An example of an implementation of the invention is a coplanar waveguide having a central thick conducting line element (32) and outer thick conducting line elements (28,30) mounted on a substrate (21). The central element overlies a thin metallic film (22) which also underlies the outer conducting line elements and is insulated from the latter by polyamide insulation (24,26).
    Type: Grant
    Filed: July 6, 1982
    Date of Patent: July 17, 1984
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventor: Brian Turner
  • Patent number: 4459567
    Abstract: A dielectric waveguide ferrite resonance isolator capable of operating in the millimeter frequency range in a dielectric waveguide transmission line is provided. The isolator comprises a thin sheet of hexagonal ferrite material that has been affixed to a side of the dielectric waveguide and then placed between the pole pieces of an electromagnet in order to magnetize and fully orient the ferrite material.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: July 10, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Richard A. Stern, Richard W. Babbitt
  • Patent number: 4459568
    Abstract: A microwave circuit is disclosed which may be employed to form a low loss, high isolation, quadrature coupler operating over a wide frequency range. The coupler includes two quarter-wave transmission lines formed on air-stripline circuit boards and held in close proximity within a housing to provide microwave coupling. The lines are separated by precise spacing elements located between the stripline circuit boards. A plurality of alignment pins retain the stripline boards in exact geometrical position with respect to one another in the coupler configuration. Wave spring washers retained on the alignment pins cooperate with the housing to insure proper board spacing for optimal performance.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: July 10, 1984
    Assignee: Rockwell International Corporation
    Inventor: Donnie L. Landt
  • Patent number: 4458229
    Abstract: A waveguide dimensioned for fundamental mode operation over a given frequency range is rendered substantially dispersionless by including within the waveguide a thin dielectric slab extending parallel to the E-field of the fundamental mode and having a dielectric constant of at least 4 and a thickness across the E-field ranging between 0.01 and 0.25 guide wavelengths at the center frequency of the given range. Appropriate thicknesses for a dielectric member having a given dielectric constant can be selected to provide overcompensation. The series connection of appropriate lengths of an overcompensated waveguide and uncompensated waveguide yield an overall waveguide having a substantially dispersionless characteristic.
    Type: Grant
    Filed: December 17, 1981
    Date of Patent: July 3, 1984
    Assignee: RCA Corporation
    Inventors: Norman R. Landry, Leonard H. Yorinks
  • Patent number: 4458223
    Abstract: A microwave window assembly has a ceramic window (12) with a thickness of more than 10 mm, corresponding to a half wavelength of the microwave energy. The window (12) has a metallized side surface and is connected by means of a soldered joint to a frame (11). The frame (11) is constructed in two parts (11A, 11B) which are soldered to respective edge parts (10A, 10B) of the side surface of the window, while the side surface between the two parts (11A, 11B) of the frame is covered with a layer (13) electrically connecting the two frame parts (11A, 11B).
    Type: Grant
    Filed: September 23, 1983
    Date of Patent: July 3, 1984
    Assignee: U.S. Philips Corporation
    Inventor: Wolfgang Schmidt
  • Patent number: 4458217
    Abstract: A compact power coupler comprises a first waveguide short-circuited at one end, a resonant cavity slot-coupled to the shorted end of the first waveguide, and a coaxial transmission line coupled to the resonant cavity. Power at 6 gigahertz is coupled from the waveguide to the transmission line in a unit that is 3.5 inches long. Alternatively, a second waveguide can be slot-coupled to a narrow-wall of the first waveguide (a quarter-wavelength from the short-circuit) to couple 4 gigahertz power, thereby forming a compact diplexer.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: July 3, 1984
    Assignee: Hughes Aircraft Company
    Inventors: Mon N. Wong, Frank A. Taormina
  • Patent number: 4458222
    Abstract: An apparatus for coupling a waveguide structure to a printed circuit transmission line connected to a solid state device requiring a DC bias comprising: a hollow waveguide connector; a base mounted onto that connector and supporting the transmission line; a transition element, preferably a coupling ridge, for RF coupling the waveguide connector to the transmission line; a connecting means for feeding the DC bias voltage from an external bias network through the wall of the waveguide connector and the transition element to the transmission line. The connecting means, and the transition element are DC insulated from the other parts of the waveguide connector. The built-in DC bias eliminates the need for biasing networks, RF chokes, filters and DC blocks mounted on the printed circuit.
    Type: Grant
    Filed: May 6, 1981
    Date of Patent: July 3, 1984
    Assignee: Microwave Semiconductor Corporation
    Inventors: Dov Herstein, Leonard S. Rosenheck
  • Patent number: 4458218
    Abstract: A dielectric waveguide reciprocal ferrite phase shifter is provided for use n a dielectric waveguide transmission line. The phase shifter is comprised of a length of ferrite of the same cross-sectional dimension as that of the dielectric waveguide and in fact becomes a section of the transmission line. The length of ferrite bears a thin plastic layer on its top and bottom surface and metal plates on each piece of plastic. The length of this multilayer structure then has a wire coil wrapped around in order to provide a d.c. magnetic biasing field along the length of the ferrite thereby enabling magnetization of the ferrite resulting in a reciprocal phase shift or change in electrical length within the structure.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: July 3, 1984
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Richard W. Babbitt, Richard A. Stern