Hughes Aircraft Company

Hughes Electronics Corporation

The Boeing Company

Louis W Hendrick

Keith N Loi

Rolf Kich

Paul J Tatomir

Frederick A Young

James M Barker

Craig N Schwartz

Robert L Reynolds

Steven O Lane

Edward L Griffin

Richard L Bennett

Ramona G Pond

Krishnan K Raghavan

Craig K Shoda

Michael J Grall

David S Levinson

Joseph A Elliott

A microwave waveguide filter includes a main-line cavity structure with a group of at least two rectangular main-line cavities arrayed along a main propagation path and including a first main-line cavity and a second main-line cavity. Each main-line cavity includes a sidewall, and each pair of adjacent main-line cavities has a common transverse wall transverse to the main propagation path and a main-line aperture in the common transverse wall. A rectangular first feedback cavity is in microwave communication with each of the first main-line cavity and the second main-line cavity through the respective sidewall of the first main-line cavity and the second main-line cavity. There is a first-cavity feedback aperture between the first feedback cavity and the first main-line cavity, and a second-cavity feedback aperture between the first feedback cavity and the second main-line cavity. There may be additional feedback cavities as well.

Microwave waveguide filter having rectangular cavities, and method for its fabrication

A common interface ( ) for a PIM sensitive diplexing filter ( ) is provided in a non-contacting, or isolated, configuration while providing PIM reliability, ESD conduction and thermal conduction, making it ideal for high power space applications. The common interface ( ) is a one-piece construction of a diplexed, or multiplexed, coaxial, or squareax, transmission line that is constructed with a direct non-contacting ( ), or connectionless, interface. Terminations ( ) connect the inner conductor ( ) to the outer conductor ( ) of the interface ( ) making the device one integral piece yet providing the necessary isolation through non-contacting interface with a PIM sensitive device and terminations ( ) that provide thermal and ESD conduction necessary for PIM reliablity.

Low PIM coaxial diplexer interface

A microwave filter has first and second subfilters. Each subfilter has at least one single mode resonator and a preset electrical response. The second subfilter is cascaded to the first subfilter by coupling one of the at least one single mode resonator of the first subfilter to one of the at least one single mode resonator of the second subfilter. The microwave filter has an overall transfer function dependent upon the selection of the first and second subfilters from a plurality of subfilters having different preset electrical responses.

Microwave filter having cascaded subfilters with preset electrical

A radiating element for an antenna incorporating a patch launcher, a bandpass filter and a polarizer all in one waveguide without the need for interconnecting individual components. The waveguide has at least one coaxial input having a patch launcher attached thereto. The inside diameter of the waveguide has a plurality of spaced apart irises that act as a bandpass filter followed by a plurality of spaced apart pins that act as a polarizer.

Antenna radiating element

A microwave cavity filter (30, 30A) is formed of a section of waveguide (36, 114) terminated by end walls (38, 40, 44, 166, 168, 176) to form cavities (32, 34, 32A, 34A) wherein ridges (100, 102, 118, 120) are disposed longitudinally within a cavity and extend from the cavity wall partway to a central region (104, 124) of the cavity. In a preferred embodiment of the invention, the ridges are disposed symmetrically about a central plane (144), each ridge having a first component (106, 122) perpendicular to the central plane and a second component (108, 126) parallel to the central plane. A cross-sectional shape of a filter cavity may approximate a semicircle wherein one wall section (88, 130) of the filter cavity is disposed within a diametric plane (216) of the cavity. The end walls of the cavities may be constructed as iris plates with apertures (82, 182, 184, 186, 190) for coupling energy of selected modes of electromagnetic resonance within the respective cavities. Each cavity supports two orthogonal modes wherein, within the region, between the parallel second components of the two ridges, the electromagnetic fields of a first mode are parallel to the central plane and the electromagnetic fields of the second mode are perpendicular to the central plane. Mode coupling screws (80, 156) may be provided for coupling of energy between the modes within a cavity. The ridging of the waveguide sections of the cavity reduces the low frequency cut-off, thereby enabling the cavities to be constructed with smaller dimensions to facilitate their emplacement within satellite communication systems.

Microwave filter assembly having a nonsymmetrical waveguide and an

A right angle waveguide junction for a microwave multiplexer is provided including a step in one of the waveguides for improved electrical response. A rectangular waveguide manifold (10) is coupled to a filter (12) which includes a coupling iris (14) and a circular cavity resonator (16). The circular cavity resonator is a circular waveguide with two ends closed by a metal wall. The structure of the waveguide multiplexer includes a step change (18) in the rectangular waveguide (10) height which controls the electrical response properties of the junction.

Microwave waveguide multiplexer

An airline transmission structure in a low temperature co-fired ceramic ('LTCC'). A cavity is made within the LTCC structure. Ground planes surround the cavity. Electronic processing circuitry, such as an airline filter, is suspended within the cavity. Transmission lines are provided to connect the electronic circuitry to the electronic signals (typically microwave) which require processing. Full integration of the airline filter with other electronic circuitry in a single LTCC package is also shown.

Airline transmission structures in low temperature co-fired ceramic

A system for supporting a dielectric resonator in a circular waveguide. A dielectric resonator is held in its optimum position using support posts or rods. The support rods are made from a suitable dielectric material, and slip fitted in holes provided at 90.degree. intervals around the periphery of the dielectric resonator. The support rods are affixed to the waveguie, by gluing or being screwed in place. The support rods are slip fitted such that they are allowed to expand, due to temperature, without causing stress on the dielectric resonator, thus the dielectric resonator is held in position without being affixed to its supporting structure. This is an inexpensive and simple solution to a complex problem. The support system is self-centering and free from all stress. The support system utilizes a minimum amount of supporting material which permits realization of the best unloaded Q.

Dielectric resonator support system for a waveguide

A dual mode circular-type waveguide filter (10) has a cylindrical waveguide body (12) separated by septums (16, 18) into a plurality of resonant waveguide cavities (22, 24, 26). Mutually orthogonal electromagnetic fields (37, 81) in adjacent cavities (24, 26) are electromagnetically coupled with each other by an internal coupling element (60) which is mounted on one of the septums (18) and extends into the adjacent cavities. The coupling element comprises an elongate, conductive wire which includes a first portion (62) extending into one of the cavities and forming a magnetic loop, and a second portion (64) extending into the adjacent cavity and forming an electric probe. The coupling element provides an asymmetrical stopband pole (72a) in the frequency response (70) of the filter.

Dual mode waveguide filter employing coupling element for asymmetric

A folded end-coupled general response TE.sub.011 filter is herein described which achieves all bridge couplings necessary for general bandpass response in a particularly convenient two-tier overlapping structure, where all couplings are made in a single removable iris, and where probe and/or slot couplings are used to achieve coupling of either sign.

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Hermosa Beach, CA, United States of America

Louis W Hendrick