Microwave multiplexer with multimode filter

Details Microwave multiplexer with multimode filter Microwave multiplexer with multimode filter

H - Electricity

01

P

363/2, 333/68

H01P 1/213 (2006.01) H01P 1/208 (2006.01)

Patent

CA 1282881

ABSTRACT OF THE DISCLOSURE A microwave multiplexer (20) has a set of independently tunable signal channels coupled to a common waveguide (22). Each of the channels has input and output 3dB couplers (40, 106) which are joined by cylindrical radiators (32, 34) carrying circularly polarized waves. Both TE and TM waves are propagated within a plurality of resonant cavities (36, 38) within each of the filters (32, 34). Coupling between the cavities (36, 38) is provided by an array of slots (88) and an array of probes (90) wherein the slots (88) couple TE waves and the probes (90) couple TM waves. Adjustment of the slots (88) and the probes (90) provides for independent coupling coefficients for the two propagation modes. A set of coaxial line probe structures (60, 62, and 120, 122) connect between the input and output couplers to end cavities of a filter for the launching of TM waves, there being discs (140) in the end cavities adjacent the probes for converting energy of a TM wave to a TE wave, thereby providing both the TM and the TE wave propagation. There results a greater versatility in the coupling allowing for greater compaction of a signal channel with reduced weight and bulk to the multiplexer.

568799

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