Class 333/253 - Including variable impedance

Subclass of Class 333 - Wave transmission lines and networks
Definition: Subject matter wherein structure is provided in the waveguide
No. of patents: 34
Last issue date: 01/09/2007

Number	Title	Issue Date
7161344	Method and structure for variable pitch microwave probe assembly A coplanar waveguide (CPW) probe includes at least one center probe element, each having a respective center probe contact point and at least one peripheral probe element, each having a respective peripheral contact point. The pitch between the at least one center c...	01/09/2007
7053657	Dynamically biased wide swing level shifting circuit for high speed voltage protection input/outputs Embodiments of the present invention recite a level shifting circuit for high voltage protection. In embodiments of the present invention, the level shifting circuit comprises a first transistor, a second transistor, a third transistor, and a fourth transistor coupl...	05/30/2006
6952144	Apparatus and method to provide power amplification Briefly, in accordance with an embodiment of the invention, an apparatus and method to increase efficiency of a power amplifier is provided. The apparatus may include a power amplifier, and a variable impedance matching circuit coupled to the power amplifier to impr...	10/04/2005
6914538	High-power well logging method and apparatus A system and method for downhole power delivery. In one embodiment, the system delivers computer-regulated downhole power voltages, and may be configured to customize signal waveforms and power allocation on the various independent signal transmission modes to maxim...	07/05/2005
6794962	Curved waveguide element and transmission device comprising the said element The invention reduces the size of waveguide circuits. The invention proposes to change the cross section of a waveguide in a curved part. Thus, a curved element according to the invention makes it possible at the same time to make a change in waveguide cross action....	09/21/2004
6472951	Microwave multiplexer with manifold spacing adjustment A series of tuning brackets are mounted on the microwave waveguide manifold at positions between the input waveguide/filter couplings. These brackets constrain the manifold and are constructed with adjustment screws extending through the brackets and mech...	10/29/2002
6191664	Microwave multiplexer with tunable manifold and method of adjustment A manifold is constructed with a primary manifold section to which the input wave guides are connected and a tuning section attached to the output of the primary manifold section. The tuning section is constructed of a deformable material which allows the...	02/20/2001
6075422	Apparatus for optimization of microwave processing of industrial materials and other products A high power microwave or radio frequency network is disclosed which utilizes [2] two movable capacitive probes in order to provide complete vector tuning [in 4 axis by] utilizing the capacitive reactance of the two capacitive probes to provide [2] two tu...	06/13/2000
5939953	E-H matching device and apparatus and method for automatically matching microwave impedance An E-H matching apparatus includes an E-plane branch waveguide connected to an E-plane of a waveguide body, an H-plane branch waveguide connected to an H-plane of the waveguide body, and plungers provided in the E-plane branch waveguide and the H-plane br...	08/17/1999
5908811	High T_c superconducting ferroelectric tunable filters This invention pertains to monolithic filters of the band-pass or band-reject type which a single crystal ferroelectric material having an electric field dependent permittivity. The filters are comprised of: a first layer of a single crystal dielectric ma...	06/01/1999
5670918	Waveguide matching circuit having both capacitive susceptance regulating means and inductive materials A waveguide matching circuit in the form of a rectangular tube, open at both ends, and in which a high-frequency signal propagates along a central axis perpendicular to the open end; at least two screws for regulating a capacitive susceptance which are pr...	09/23/1997
5663694	Triggered-plasma microwave switch and method A microwave switch selectively directs a microwave signal along first and second signal paths. The switch includes a microwave transmission member, a microwave chamber formed by the transmission member for containing an ionizable gas, input and output por...	09/02/1997
5473294	Planar variable power divider A novel planar variable power divider, using waveguide technology, includes two hybrids and two variable phase shifters. The variable power divider includes a variable phase shifter based on a 3 dB hybrid circuit terminated by two sliding non-contacting m...	12/05/1995
5387884	Impedance matching flange for a rectangular waveguide A method and apparatus for adjusting the impedance of an electromagnetic energy-actuated device. An auxiliary test flange includes a substantially planar metallic member. An internal aperture matches the dimensions of the waveguide cavity formed at the ma...	02/07/1995
5148131	Coaxial-to-waveguide transducer with improved matching An end portion (14a) of a center conductor (14) of a coaxial cable (16) protrudes transversely into a tubular waveguide (10) near an end thereof. A piston (22) having a stepped inner wall (24) closes the end of the waveguide (10). The inner wall (24) is f...	09/15/1992
4688008	Locking, adjustable waveguide shorting piston A waveguide shorting device having a shorting block and a wedge is disclosed. The shorting block contains a channel which is tapered so that it matches a taper of the wedge. A screw extends through the shorting block and engages a threaded hole in the wed...	08/18/1987
4686497	Adjustable waveguide short circuit An adjustable waveguide short circuit using a thin partition or rectangular pin parallel to the E-field in the waveguide and movable along longitudinal slots centrally located on the two broad walls of the waveguide....	08/11/1987
4631503	Grooved waveguide shorting block and method of assembly A waveguide or waveguide phase shifter is terminated with a short circuit provided by a rigid conductive block which is sized to be a close tolerance fit within the waveguide. The block has grooves in its faces adjacent to the waveguide walls. The walls o...	12/23/1986
4626883	Textured crystal picosecond photoresponsive element Picosecond response photoconductors and photoresponsive elements can be provided that retain high carrier mobility and yet have short lifetime by providing on a crystal mismatched substrate a textured layer of domain regions wherein the domain size is suc...	12/02/1986
4604592	Electrically controlled radio frequency tuner An electrically controlled radio frequency tuner used in conjunction with an antenna. The antenna used both as a transmitter and a receiver. The tuner eliminating waveform reflection and circulator feedthrough of transmitted signals which heretofore refle...	08/05/1986
4502023	Method of fabricating a varactor/oscillator diode module for a tunable oscillator In a method of fabrication of a module formed by a semiconductor diode which oscillates in millimeter waves and by a variable-capacitance diode, the oscillating diode is mounted on a pedestal at the center of a support base. A ring of fused silica for sup...	02/26/1985
4465989	Temperature-stabilized microwave filter In a temperature-stabilized microwave filter, each resonant cavity (5) is tuned by means of a tuning rod (10) of a thermally stable material. A first end of each tuning rod (10) extends into the respective cavity (5) without touching its surface. A second...	08/14/1984
4380747	Tunable ultra-high frequency filter with variable capacitance tuning devices The invention relates to ultra-high frequency filters with variable capacitance tuning devices tunable in a wide frequency range. Each tuning device comprises two coaxial fingers, namely a fixed finger and a finger movable in the filter body. One of these fing...	04/19/1983
4376923	Ultra-high frequency tuning device of the sliding contact type The tuning device comprises a hollow cylindrical part and a moving rod which penetrates a cavity by passing from one side to the other of the hollow cylindrical member. This cylindrical member is fixed and integral with the cavity. It has an end located w...	03/15/1983
4348773	Microwave receiver converters having a hybrid waveguide structure A microwave receiver converter apparatus of a balanced mixer type utilizes a hybrid waveguide having a parallelopiped construction having one side, which is open, adapted to receive a radio frequency (RF) input and provided with a susceptance device, a se...	09/07/1982
4293828	Arrangement for suppressing interference waves and harmonic waves in traveling wave tubes with a short circuiting slide in the output wave guide An arrangement for suppressing interference waves and harmonic waves in traveling wave tubes has a short circuit slide in an output wave guide in which the slide has a groove in the form of a λ/4 or λ/2 wave guide element in its frontal surface which is...	10/06/1981
4240050	Two stub tuner in waveguide bend In order to cancel unwanted reflected waves in a waveguide system, two micrometer-driven stub tuners are inserted in a waveguide bend. A first tuner is inserted through the outer bend wall to extend axially along one leg of the bend and includes a dielect...	12/16/1980
4216450	Millimeter waveguide shorts The present invention relates to millimeter waveguide shorts and methods for making said shorts wherein an exemplary rectangular cross-sectioned waveguide short comprises a base substrate such as steel shimstock or foil having a width equal to the associa...	08/05/1980
4086543	Travelling wave hybrid junction amplifier The basic module of a microwave Travelling-Wave Hybrid Junction amplifier (TWHJ) consists of a hybrid junction (0°, 180° or 90° hybrid) combined with an appropriate phase-shifting element (π/2 element is needed for 0° and 180° hybrids and no element...	04/25/1978
4054255	Microwave ice detector A system for detecting ice on exterior surfaces of aircraft by transmitting a relatively low power microwave electromagnetic signal into a dielectric layer functioning as a surface waveguide, and monitoring the signals transmitted into and reflected from ...	10/18/1977
4041421	Stabilized locking mechanism for threaded tuning screws in waveguides A threaded invar tuning screw extending through the threaded aperture of an invar bushing in the broad wall of a waveguide filter presents a capacitance inside the waveguide. This capacitance is varied by changing the depth of the screw in the waveguide i...	08/09/1977
3980974	Compact, waveguide-type microwave transmit-receive apparatus A microwave transmitting and receiving apparatus comprises a Gunn diode as an oscillating element and a mixer diode as a receiving element disposed within a rectangular waveguide closed at one end by its short-circuiting plate. The oscillating and receivi...	09/14/1976
3975695	Waveguide beyond cutoff coupler for coupling to resonant cavity A coupler capable of correctly coupling a microwave source into a resonant avity in a cryogenic environment. The coupler utilizes a rotary mechanical means to adjust the energy through the waveguide-beyond-cutoff into the cavity and control the reflections...	08/17/1976
3972013	Adjustable sliding electrical contact for waveguide post and coaxial line termination A waveguide post slides through a resilient barrel which is adjustably clamped against the waveguide post to control its slidability and provide reliable electric contact. As a sliding short for a coaxial transmisson line termination, a shorting bar incor...	07/27/1976

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Class 333/253 - Including variable impedance