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| Number | Title | Issue Date |
| 7253708 | Radio frequency cavity resonatory with heat transport apparatus An RF cavity resonator that includes: a resonator chamber for containing an RF field; an RF coupling element coupled to the resonator chamber for introducing the RF field into and extracting the RF field from the resonator chamber; a tuning assembly for causing the ... | 08/07/2007 |
| 7227434 | Tuning screw assembly The present invention relates to a tuning screw assembly comprising a sleeve (100) with internal threads for engaging a tuning screw (200) having external threads. The sleeve comprises a first threaded portion (32) which is axially displaced in ... | 06/05/2007 |
| 7224248 | Ceramic loaded temperature compensating tunable cavity filter A high Q RF cavity resonator loaded with a ceramic disc, the resonator comprising an inner conductive post having a length less than a quarter wavelength. The resonance frequency of the resonator is tunable by changing a distance between a) an outer plate and b) a c... | 05/29/2007 |
| 7202668 | Microstrip coil design for MRI apparatus A microstrip-based RF coil for use in an MRI apparatus constructed to perform human head imaging is provided and includes (a) a cylindrical non-magnetic core module having an outer surface and a longitudinal axis, a cylindrical bore extending through the core module... | 04/10/2007 |
| 7046105 | System and method for threaded plunger assembly A system and method for a plunger assembly includes a tuning slug with a bore in the stem, a tuning screw rotatably disposed in the stem, and a coupling assembly to rotatably secure the tuning screw to the slug. The system and method may also include a locking assem... | 05/16/2006 |
| 7012501 | Electrical multi-layer component An electrical component includes a base body that contains dielectric layers. The dielectric layers are superimposed and contain ceramic. The component also includes outer contacts on an exterior of the base body, and a resistor in an interior of the base body locat... | 03/14/2006 |
| 6982615 | System and method for threaded plunger assembly A system and method for a plunger assembly includes a tuning slug with a bore in the stem, a tuning screw rotatably disposed in the stem, and a coupling assembly to rotatably secure the tuning screw to the slug. The system and method may also include a locking assem... | 01/03/2006 |
| 6970058 | L-C type filter module and helical filter made up of at least two such modules An L-C type filter module comprising at least two capacitors and at least one inductor. Each of the capacitors consists of a first elongated element made of conductive material partially fitted in a hole made in a second element made of conductive material, connecte... | 11/29/2005 |
| 6407651 | Temperature compensated tunable resonant cavity A tunable resonant cavity including a cavity housing having top and bottom walls with a post disposed in said cavity extending from die bottom of the cavity toward and spaced from the top. The length of the post is adjustable to adjust the resonant freque... | 06/18/2002 |
| 6362708 | Dielectric resonator tuning device A temperature-compensating tuning device is disclosed for tuning and temperature stabilizing the resonant frequency of a dielectric resonator. The tuning device comprises a tuning element in the form of a cylindrical shaft, an inner sleeve coaxially aroun... | 03/26/2002 |
| 6133800 | Subminiature microwave cavity An extremely small and inexpensively manufactured physics package for an atomic frequency standard can be provided with a microwave cavity having non-critical dimensions that is driven in a substantially TEM mode by a lumped LC means, the cavity resonant ... | 10/17/2000 |
| 5982251 | Tuner for radio frequency transmission lines A tuner for radio frequency coaxial cable transmission lines is provided. It requires only one micrometer adjusting screw since the capacitor electrode that mates with the central conductor of the coaxial line is not only curved to give a large area in pr... | 11/09/1999 |
| 5818314 | Tunable electromagnetic wave resonant filter There is disclosed a radio frequency device having a housing, a cover disposed atop the housing, and a rod. A fastener such as a nut is attached to the rod and engages the cover. When the fastener is rotated, the cover moves with respect to the housing, t... | 10/06/1998 |
| 4983938 | Band-stop filter A band-stop filter comprises a plurality of resonator units each comprised of an end-shorted coaxial resonator and a variable condenser connected in series therewith, a printed circuit board combining said resonator units in a multistage having thru-holes... | 01/08/1991 |
| 4933652 | Tem coaxial resonator A coaxial resonance cavity of either the fingered or unfingered variety having a metal heat conducting barbell shaped structure inside the movable tuning plunger to conduct heat from the inner surface of the movable plunger to the inner surface of the fix... | 06/12/1990 |
| 4901044 | Distributed-constant filter A quarter-wave distributed-constant dielectric filter or resonator having a ceramic body which typically is composed principally of barium titanate. The ceramic filter body has one or more resonance holes extending therethrough. A conductive covering of s... | 02/13/1990 |
| 4794354 | Apparatus and method for modifying microwave The microwave frequency characteristics of a cavity having a center conducting element and conducting cavity are modified by changing the length of the center conducting element. The resonating structure is comprised of a coaxial member providing the prin... | 12/27/1988 |
| 4775847 | Tunable resonant cavity filter structure with enhanced ground return A tunable resonant cavity filter structure is disclosed which includes an enhanced ground return internal to the cavity which effectively eliminates generation of deterioration wide band noise and optimizes unloaded Q as well as rending resonant frequency... | 10/04/1988 |
| 4730174 | Dielectric material coaxial resonator with improved resonance frequency adjusting mechanism The disclosure is directed to a dielectric material coaxial resonator provided with an improved resonance frequency adjusting mechanism which is arranged to eliminate deviations of the resonance frequency after adjustment for adjusting the resonance frequ... | 03/08/1988 |
| 4675631 | Waveguide bandpass filter A waveguide bandpass filter having multiple waveguide sections including alternating ridge waveguide sections and evanescent waveguide sections. The ridge waveguide sections define a resonant cavity and the evanescent waveguide sections reactively load th... | 06/23/1987 |
| 4660005 | High frequency electrical network An h.f. electrical network consists of a transmission line device in the form of a closed cavity having two end plates between which extend four quarter wave resonators positioned symmetrically about an axis passing through both end plates. The device is ... | 04/21/1987 |
| 4631506 | Frequency-adjustable coaxial dielectric resonator and filter using the same A coaxial dielectric resonator for VHF and/or UHF band comprising a generally cylindrical dielectric having inner surface and outer surface. The inner and outer surfaces of the dielectric are respectively covered by outer and inner conductors and these co... | 12/23/1986 |
| 4613838 | Dielectric resonator A dielectric resonator employing TM010 mode or its variation mode, and including a cavity resonator and a columnar inner dielectric member accommodated within the cavity resonator a region being formed at an end face of the inner dielectric mem... | 09/23/1986 |
| 4521754 | Tuning and temperature compensation arrangement for microwave resonators The microwave resonator includes an enclosed resonator housing and a hollow central conductor having one end fastened to a bottom of the resonator housing and extending toward a top wall of the resonator housing. The other end of the central conductors is... | 06/04/1985 |
| 4494093 | Lockable tuning mechanism with reduced backlash Apparatus for frequency tuning a waveguide cavity comprises a retainer ring and a knob that are threaded onto a plunger in a spaced apart relationship, with the plunger extending into the cavity. Means is provided for preventing rotation of the plunger an... | 01/15/1985 |
| 4491806 | Resonant cavity with integrated microphonic suppression means The invention is a microphonics suppression means for a high frequency resonant cavity. The resonant cavity is used in a RF oscillator to generate UHF/VHF frequencies. The resonant cavity comprises an outer wall portion, a center conductor portion, a tuni... | 01/01/1985 |
| 4460878 | Tunable resonator and an ultrahigh-frequency circuit comprising at least one such resonator There is provided a resonator comprising principally a hollow metal finger integral with the wall of a guide or a cavity. A metal plunger, coated with a fine dielectric layer, of fairly low permittivity, is able to slide inside the hollow metal finger to ... | 07/17/1984 |
| 4451806 | Tuning means for a transmisson line cavity A transmission line cavity comprises an outer conductor and a center conductor. The cavity is in combination with a source, such as a power tube, for establishing electromagnetic waves within the cavity. The impedance of the center conductor may be change... | 05/29/1984 |
| 4446463 | Coaxial waveguide commutation feed network for use with a scanning circular phased array antenna A dominant TEM mode and a pair of spatially orthogonal TE11 modes suitably excited at the input ports of a coaxial waveguide commutator portion of a coaxial waveguide commutation feed network are employed to generate a commutatable low-sidelobe... | 05/01/1984 |
| 4445100 | Coupling block assembly with band-reject filter A band-reject filter comprises a resonator with an adjustable resonator rod which is mounted in proximity to a co-axial assembly. The coupling rod passes thru the inner conductor of the co-axial assembly and extends into the resonator. At the end of the r... | 04/24/1984 |
| 4389624 | Dielectric-loaded coaxial resonator with a metal plate for wide frequency adjustments A coaxial resonator comprising an outer conductor with closed and open ends, an inner conductor concentrically disposed in the outer conductor to establish a short circuit at the closed end and an open circuit at the open end, and a dielectric member moun... | 06/21/1983 |
| 4363000 | Power amplifier tank circuit An RF tank circuit for a transmitter power amplifier stage including a half-wave length "folded" coaxial transmission line as an anode tuning device. The tank circuit has a grounded outer conductor and an ungrounded inner conductor, the latter to be opera... | 12/07/1982 |
| 4334203 | Second harmonic suppressor for power amplifier tank circuit A device to suppress the generation of second harmonic frequencies in a power amplifier tank circuit such as may be used in a radio frequency transmitter. The present invention employs a device connected between the outer conductor (which is normally at g... | 06/08/1982 |
| 4313091 | Crankshaft tuning mechanisms for microwave oscillators A resonant cavity of a microwave generator, such as a magnetron oscillator, is provided with a tuning piston which is rectilinearly displaceable between two terminal positions, corresponding to respective limiting frequencies, by means of a rotating crank... | 01/26/1982 |
| 4311975 | Frequency band filter A frequency band filter includes a plurality of coupled elementary resonator cavities defined by pistons disposed within a coaxial line. The position of the pistons along the line is adjustable thereby providing selectable tuning.... | 01/19/1982 |
| 4271399 | Dielectric resonator for VHF to microwave region A high frequency miniaturized dielectric resonator is disclosed. The resonator includes an elongated dielectric member axially hollow at least in part of its cross section. A conductor surrounds the dielectric member, and a metal rod is inserted into the ... | 06/02/1981 |
| 4247828 | Reciprocating piston tuning mechanism for a microwave oscillator A resonant cavity of a microwave generator, such as a magnetron oscillator, is provided with a tuning piston which is displaceable between two terminal positions, corresponding to respective limiting frequencies, by means of a rotating crank-shaft whose e... | 01/27/1981 |
| 4234855 | System for linearly tuning a microwave oscillator A resonant cavity of a microwave generator, such as a magnetron oscillator, is provided with a tuning piston which is displaceable between two terminal positions, corresponding to respective limiting frequencies f1 and f2, by means o... | 11/18/1980 |
| 4207548 | Tuned circuits A coaxial resonator is provided having an outer conductor with top and bottom closures and a substantially central opening through the top closure through which a tubular member forming a center conductor extends. The center conductor also comprises a plu... | 06/10/1980 |
| 4205286 | Temperature stabilized helical resonator The coil form for a helical resonator is comprised of two sections connected by a flexible joint. The coil form/winding assembly is positioned within a cavity such that the ends of the coil forms are affixed to the cavity walls. A tuning screw threads int... | 05/27/1980 |
