Patents Examined by Marvin L. Nussbaum
  • Patent number: 4823098
    Abstract: A ceramic filter includes a multiple zero bandstop filter function. The ceramic filter has a dielectric block with top and bottom surfaces and at least two holes, including a first hole and a second hole, extending from the top surface toward the bottom surface of the block. The block is selectively covered with a conductive material to provide a transmission line resonator for each of the two holes. The filter also includes an input electrode coupled to the dielectric means at a predetermined distance from the first hole, and an output electrode coupled to the dielectric means at a predetermined distance from the second hole. Finally, conductive plating, in the form of a transmission line, is contiguously disposed on the dielectric means adjacent the two holes and coupled thereto to provide a bandstop filter function with a zero represented at each hole.
    Type: Grant
    Filed: June 14, 1988
    Date of Patent: April 18, 1989
    Assignee: Motorola, Inc.
    Inventors: David M. DeMuro, Darioush Agahi-Kesheh
  • Patent number: 4823206
    Abstract: In a video signal recording and/or reproducing apparatus including four magnetic heads mounted on a rotary drum for forming four parallel recording tracks in a repeating sequence on a recording medium with each track having an azimuth gap angle different from the azimuth gap angles of the next adjacent tracks; pilot signals having different frequencies are recorded in a superimposed manner upon the information signals recorded by the four magnetic heads, respectively, and, upon reproducing, tracking control is effected so as to ensure that the magnetic heads which recorded the pilot signals with different respective frequencies are used to reproduce the signals recorded in the respective recording tracks so that a period of a timing signal, for example, a horizontal synchronizing signal, contained in the reproduced signal will not be disturbed upon switching from one to another of the magnetic heads in the reproducing mode.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: April 18, 1989
    Assignee: Sony Corporation
    Inventors: Shoji Nemoto, Yukihiko Machida
  • Patent number: 4821005
    Abstract: Electrical circuit component assembly 28 of the present invention is comprised of three electrical circuit component members, 32, 40 and 41, respectively that are assembled such that first member 32 is in series and second and third members 40, 41 are in parallel with a signal, when assembly 28 is electrically connected between respective ends 64, 66 of discontinuous conductor 62 on circuit board 60. Electrical circuit component assembly 28 includes first member 32 having first and second electrically conductive portions 34, 38 at spaced locations along its body 36; second member 40 having first and second conductive areas 42, 46 at spaced locations on body member 44, and third member 41, having first and second conductive areas 43, 47 at spaced location thereon.
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: April 11, 1989
    Assignee: AMP Incorporated
    Inventor: John P. Kling
  • Patent number: 4821003
    Abstract: This electromagnetic variable delay line includes: a delay line, which includes an inductance device and at least one variable capacitance diode connected thereto, and possessing a non linear operational property; and a circuit device for supplying an output control signal to the variable capacitance diode in a manner which varies non linearly with an input control signal. The circuit means has a non linear property which is substantially complementary and opposite to the non linear delay property of the delay line. Optionally but desirably, the delay line may include: several delay line elments, connected in series, each of which includes an inductance device and a variable capacitance diode connected to the inductance device, the variable capacitance diodes being connected together; and buffer circuits connecting together each adjacent pair of these delay line elements.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: April 11, 1989
    Assignee: Elmec Corporation
    Inventor: Kazuo Kameya
  • Patent number: 4821004
    Abstract: Methods are disclosed for the elimination of spurious echos in electro-acoustic delay lines using bulk waves. The method consists in etching an array, formed of hollows and peaks on a reflecting side of a delay line of this type, the difference in height between the said hollows and peaks giving the waves reflected from them a phase difference such that the signals induced by the spurious echos in the transducer cancel one another out. The method can be used to improve the characteristics of a delay line using bulk waves without excessively complicating its manufacture.
    Type: Grant
    Filed: January 14, 1988
    Date of Patent: April 11, 1989
    Assignee: Thomson-CSF
    Inventors: Philippe Defranould, Marc Verroust
  • Patent number: 4821006
    Abstract: The dielectric resonator apparatus is characterized in that electric walls exist on one plane or two including the central axis of the electromagnetic field distribution in the using mode of a dielectric resonator, a dielectric resonator with either of dielectrics between the electric wall being removed in shape is provided by plurality, an equivalent axis is common to the central axis of each of the dielectric resonators, with the dielectric resonators being inductively coupled in the axial direction. A dielectric resonator which prevents the current from being concentrated on the central axis of the electromagnetic field distribution, is collectively smaller in the Joule loss and is higher in Q. The dielectric resonator of the present invention is characterized in that the dielectric close to the central axis is removed, wherein electric walls exist on one plane or two including the central axis of the electromagnetic field distribution in a dielectric resonator using, for instance, a TE.sub.01.delta.
    Type: Grant
    Filed: January 14, 1988
    Date of Patent: April 11, 1989
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Youhei Ishikawa, Kikuo Tsunoda, Toshiro Hiratsuka, Hirotsugu Abe
  • Patent number: 4818961
    Abstract: A group-type unidirectional surface acoustic wave filter composed of sending electrodes, reflecting electrodes and meander electrodes constituted by interdigital electrodes, respectively. As a phase shifter of the filter, a capacitive element is used. The geometrical configuration of the meander electrode is determined in accordance with geometrical phase difference. The filter enjoys low insertion loss with a simplified structure.
    Type: Grant
    Filed: April 14, 1988
    Date of Patent: April 4, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Toshimitsu Takahashi, Takashi Shiba, Yuji Fujita, Jun Yamada
  • Patent number: 4818957
    Abstract: A ferrite toroid retainer 10 provides an apparatus for retaining ferrite toroids 1 on an electrical cable 2 to prevent chafing of the cable's insulation. The device is constructed from an elastomer material. Ferrite toroid retainer 10 is constructed from a toroidal sleeve 11 having an inside diameter B equal to that of the outside diameter A of electrical cable 2. The outside diameter C of ferrite toroid retainer 10 is equal to that of the inside diameter F of ferrite toroid 1. A retaining ridge 12 is attached around the circumference of one end of toroidal sleeve 11 and has a tapered leading edge 13. Attached around the circumference of the opposite end of toroidal sleeve 11 is a non-tapered retaining ridge 15. Perpendicular edges 14 prevent ferrite toroids 1 from sliding off of toroidal sleeve 11.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: April 4, 1989
    Assignee: Hewlett-Packard Company
    Inventor: Robert W. Cort
  • Patent number: 4816788
    Abstract: A high frequency band-pass filter which includes a single resonator or a plurality of resonators adapted to pass a high frequency signal of a predetermined frequency band region, and an active element device electrically coupled with one or the plurality of the resonators so as to present a negative resistance when the resonator is in a resonant state.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: March 28, 1989
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Youhei Ishikawa, Hiroaki Tanaka
  • Patent number: 4816785
    Abstract: The disclosed multipactor device has a waveguide bandpass filter structure including a plurality of spaced pairs of opposing electrodes defining respective gaps therebetween in which multipactor action can occur in response to input microwave power in excess of a predetermined level. A radioactive source of beta particles provides electrons within the bandpass filter structure to ensure a very rapid commencement of multipactor action. The radioactive source includes a disk coated with a tritium compound and mounted in a transverse bore adjacent to the bandpass filter structure.
    Type: Grant
    Filed: December 31, 1987
    Date of Patent: March 28, 1989
    Assignee: Hughes Aircraft Company
    Inventors: Thomas P. Carlisle, Mark R. Thek, Rudolph G. Suchannek
  • Patent number: 4812789
    Abstract: A wideband balanced diplexer splits an incoming wideband microwave frequency signal into separate upper and lower frequency outputs and possesses a sharp band cut-off to increase effective bandwidth. The diplexer includes a pair of waveguide assemblies for separating the upper frequency band from the incoming signal. Each waveguide assembly includes a tuneable, ridged waveguide phase shifter for shifting the phase of the lower frequency band, a reference waveguide for inserting a delay onto the upper frequency signal in order to compensate for the effects of the phase shifter in the other waveguide assembly, and a high pass filter. The high pass filter includes a ridged waveguide having tapered ends of a shape comprising an exponential function raised to a cosine squared power to increase the bandwidth of the upper frequencies and to provide a sharper frequency cut-off.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: March 14, 1989
    Assignee: Hughes Aircraft Company
    Inventor: Kuan M. Lee
  • Patent number: 4812791
    Abstract: A resonator for microwave or VHF-UHF bands has a ring dielectric plate, one surface of which is metalized to make a resonant line, and at least one of other surfaces of which is also metalized to make a grounded or earth conductor. The resonator is very small in size and has a large unloaded Q value. Several embodiments are disclosed.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: March 14, 1989
    Assignee: Matsushita Electric Industrial Co. Ltd.
    Inventors: Mitsuo Makimoto, Motoi Ohba
  • Patent number: 4806889
    Abstract: A dielectric ceramic body for use in a band-pass filter. The ceramic body has a plurality of through holes formed to extend transversely from one side surface to another side surface which is opposite to the one side surface and arranged in series along a longitudinal direction of the body. Slits are formed on one of the aforementioned two side surfaces between respective two holes. The slits have depths which increase toward end portions of the ceramic body.
    Type: Grant
    Filed: April 28, 1988
    Date of Patent: February 21, 1989
    Assignee: TDK Corporation
    Inventors: Fumihito Nakano, Kiyoshi Hagawa, Kenji Endo, Kohei Wada, Katsuya Jindou
  • Patent number: 4806890
    Abstract: A tuneable microwave filter comprises two branches of the same type each of which is connected to ground (22, 24) at each end and each of which includes a series-connected variable capacitance diode (13, 13A) controlled by a D.C. signal (V), said filter being disposed on the first face (9) of a plane substrate (8), with each branch comprising in series:a micro-strip transmission line (11, 11A);a second variable capacitance diode (12, 12A) situated between the first diode (13, 13A) and the micro-strip transmission line (11, 11A); andthe input (E) and the output (S) of said filter taking place at the points interconnecting the micro-strip transmission lines (11, 11A) and the second variable capacitance diodes (12, 12A) of respective ones of the first and second branches. The filter is applicable, in particular, to space telecommunications.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: February 21, 1989
    Assignee: Alcatel Thomson Faisceaux Hertziens
    Inventors: Mustafa Gurcan, Maurice Bernaud
  • Patent number: 4805042
    Abstract: In a recording and reproducing or editing apparatus for recording, in successive slant tracks on a magnetic tape, at least a first information signal and, thereafter, a second information signal along with respective time code signals, the time code signal recorded with the first information signal is reproduced therewith prior to the commencement of the recording of the second information signal, and the time code signal to be recorded with the second information signal is synchronized with the reproduced time code signal so that, upon the recording of the second information signal after the first information signal, the respective recorded time code signals represent a continuous time code.
    Type: Grant
    Filed: November 9, 1987
    Date of Patent: February 14, 1989
    Assignee: Sony Corp.
    Inventor: Yutaka Nishikata
  • Patent number: 4803448
    Abstract: A cantilever mount for a substrate lamina of a surface wave device wherein the substrate lamina 42 of the component is attached only at its one end 45 and is a wedge-shaped structure. The tapered end 46 of the substrate lamina 42 which is remote from the atachment location is mounted above the surface 41 of the base plate 41 which causes minimization of disturbing influences.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: February 7, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Peter Zibis, Wolfgang Pahl
  • Patent number: 4803449
    Abstract: This invention relates to the structure of a band-pass or band-rejection filters by combining a plurality of one-port surface acoustic wave resonators whose interdigital electrode fingers are disposed on a piezoelectric substrate. The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-port surface acoustic wave resonators disposed on a piezoelectric substrate for transmitting elastic surface wave and a plurality of circuit elements containing capacitance elements, and one-port surface acoustic wave resonators disposed between the electrodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection- and passing-band.
    Type: Grant
    Filed: November 18, 1987
    Date of Patent: February 7, 1989
    Assignees: Hitachi Video Engineering, Inc., Hitachi, Ltd.
    Inventors: Mitsutaka Hikita, Yoichi Saigo, Kazuhito Kurosawa
  • Patent number: 4800348
    Abstract: An adjustable electronic filter apparatus is disclosed comprising a dielectric block having one or more through-holes and having a conformal conductive coating substantially over all outside surfaces as well as each through-hole therein. Each through-hole so plated forms a resonator from a transmission line which includes an open portion, for providing capacitive reactance at a first end, and a short-circuited end as a base, for providing an associated distributed inductance at a second end thereof. A unique method of tuning the adjustable electronic filter, whether a single resonator, a plurality of resonators, or a plurality of intercoupled multi-resonator filters, is disclosed that permits bi-directional tuning for at least one resonator in each of the above exemplary embodiments. By selectively adjusting an inductive portion of the plating at the base of each resonator so tuned, a resonator is quickly and accurately adjusted to a desired frequency.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: January 24, 1989
    Assignee: Motorola, Inc.
    Inventors: George C. Rosar, David G. Clifford, Jr.
  • Patent number: 4800347
    Abstract: A dielectric filter includes a single block made of dielectric material having three or more through holes, in each of which an inner conductor is deposited, to define three or more dielectric resonators coupled in a cascade manner. Coupling holes are each formed between a pair of neighboring dielectric resonators. A bypass circuit, having a reactance component, is provided for connecting between two or more coupling holes; or for connecting the through hole of the dielectric resonator and a coupling hole; or for connecting the input terminal and one or more through holes of the dielectric resonators or the coupling holes. By selecting the holes to be interconnected and the value of the reactance of the bypass circuit, it is possible to provide a filter having a frequency characteristic in a desired format, including at least one pole at a selected point in an attenuation region thereof, without any increase in the number of dielectric resonator stages of the dielectric filter.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: January 24, 1989
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tadahiro Yorita, Motoharu Hiroshima
  • Patent number: RE32859
    Abstract: Acoustic surface wave devices of a novel class characterized by the provision of coupling means comprising at least several spaced filamentary electrical conductors extending over a first region and a second region for causing acoustic surface waves propagated across the coupling means in the first region to interact with acoustic surface waves propagated across the coupling means in the second region, by means of alternating electric signals induced on the filamentary electric conductors. The regions to be coupled are preferably formed on piezoelectric material, but modified forms of the coupling means can be made operable with other materials and suitable biassing fields.
    Type: Grant
    Filed: January 12, 1987
    Date of Patent: February 7, 1989
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Frank G. Marshall, Edward G. S. Paige