Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1987-06-08
1988-10-11
Nussbaum, Marvin L.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333 21R, 333209, 333212, 333230, H01P 1208, H01P 1213
Patent
active
047774592
ABSTRACT:
A microwave multiplexer has a set of independently tuneable signal channels coupled to a common waveguide. Each of the channels has input and output 3 dB couplers which are joined by cylindrical radiators carrying circularly polarized waves. Both TE and TM waves are propagated within a plurality of resonant cavities within each of the filters. Coupling between the cavities is provided by an array of slots and an array of probes wherein the slots couple TE waves and the probes couple TM waves. Adjustment of the slots and the probes provides for independent coupling coefficients for the two propagation modes. A set of coaxial line probe structures connect between the input and output couplers to end cavities of a filter for the launching of TM waves, there being discs 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 signal channel with reduced weight and bulk to the multiplexer.
REFERENCES:
patent: 4614920 (1986-09-01), Tong
Southworth, "Principles and Applications of Waveguide Transmission", fifth printing, D. Van Nostrand Co., Inc., Princeton, New Jersey, Sep. 1961, pp. 120, 325-331 and title page.
Williams et al, Dual-Mode Canonical Waveguide Filters", IEEE Trans. on Microwave Theory and Techniques, vol. MTT-25, No. 12, Dec. 1977; pp. 1021-1026.
Hughes Aircraft Company
Karambeles A. W.
Meltzer Mark J.
Mitchell Steven M.
Nussbaum Marvin L.
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