Multiple coupled cavity waveguide bandpass filters
AssigneeCommunications Satellite Corporation
InventorAlbert E. Williams
Life of this patent
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Abstract
The relative positions of the cavities in known single or dual mode multiple coupled cavity waveguide bandpass filters are rotated to achieve new filter structures in which the primary cavity couplings remain intact while the secondary couplings are shifted. The cavity rotation provides design flexibility since the input and output ports can now be taken from the same side of the filter structure. An additional advantage in dual mode filters is that the rotation permits the physical separation of input and output cavities, thereby providing increased isolation and eliminating spurious out-of-band coupling.
Claims7
A plural cavity filter comprising a plurality of n cascaded cavities, including end cavities each coupled to k other cavities and side cavities each coupled to (K+1) other cavities, said filter having an input port and an output port wherein the improvement comprises both said input port and said output port being taken from adjacent cavities on the same side of the filter with at least one of said input and output ports being taken from a side cavity.
Dependencies are inferred from the claim text.