Waveguide manifold coupled multiplexer with triple mode filters
AssigneeCom Dev Ltd.
InventorRobert S. K. Tong
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Abstract
A multiplexer has a plurality of bandpass filters coupled through E-plane or H-plane T-junctions to a waveguide manifold. Where the multiplexer has four channels and each filter is a six-pole filter, two triple mode cavities make up each filter. Where each filter is a five-pole filter, one triple cavity and one dual mode cavity makes up each filter. Two band edge channel filters are operated to produce an asymmetrical filter function response, thereby causing extra transmission zeros to be created and improving the selectivity of the filter out of the passband. The multiplexer is designed for use in satellite communication systems and can have a reduced volume and weight when compared to previous multiplexers without any sacrifice in electrical performance.
Claims12
A multiplexer comprising a plurality of bandpass filters, each filter having an input and output, with said output being coupled through a T-junction to a waveguide manifold, at least one filter being a triple mode filter and having at least one cavity that resonates in a triple mode when said triple mode filter is operated in suitable propagation modes to produce an elliptic function response, said cavity having two end walls that are parallel to one another.
Dependencies are inferred from the claim text.