Super q dual mode cavity filter assembly
AssigneeCOM DEV International Ltd.
InventorsBahram Yassini, Ming Yu
Life of this patent
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Abstract
A microwave cavity filter is configured for operation in the dual TE22N mode to realize a very high Q factor at very high frequency ranges. The microwave filter is formed from using one or more cylindrical cavities in which two orthogonal field polarizations of the TE22N mode are excited and coupled together by means of a coupling element. Different combinations of inter-cavity irises provide for both direct and cross-coupling of aligned field polarizations in adjacent cavities, as required, to realize complex filter functions. The irises may be formed in either a side or end wall of the cavities for both collinear and planar mount configuration. Negative mode coupling also allows for transmission zeros to be realized on either side of the filter passband.
Claims20
A microwave resonator assembly comprising:
- a cavity defined by an electrically conductive cylindrical enclosure in which electromagnetic energy radiated into the cavity resonates in a plurality of resonance modes comprising a dual TE22N mode, N greater than or equal to one;
- an input port provided in the cylindrical enclosure for radiating a first TE22N mode having a first polarization into the cavity;
- and
- a discontinuity formed within the cavity for electromagnetically coupling the first TE22N mode with a second TE22N mode having a second polarization orthogonal to the first polarization.
A microwave resonator filter comprising:
- a plurality of cavities including at least a first cavity and a second cavity located adjacent to the first cavity, each of the first cavity and the second cavity defined by a corresponding electrically conductive cylindrical enclosure in which electromagnetic energy radiated into that cavity resonates in a plurality of resonance modes comprising a dual TE22N mode, N greater than or equal to one;
- and
- at least one coupling element for radiating electromagnetic energy between the first cavity and the second cavity, the at least one coupling element configured to electromagnetically couple a first TE22N mode resonating in the first cavity with a fourth TE22N mode resonating in the second cavity, and a second TE22N mode resonating in the first cavity with a third TE22N mode resonating in the second cavity, the first and fourth TE22N modes having a first polarization and the second and third TE22N modes having a second polarization orthogonal to the first polarization.
Dependencies are inferred from the claim text.