Multiplex communications – Wide area network – Packet switching
Patent
1979-01-08
1981-03-24
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
333 29, H04J 108
Patent
active
042584353
ABSTRACT:
Bandpass channel filters are connected to a uniform impedance manifold. Immittance compensation is provided in a way that preserves the canonic form of the network while at the same time serving to separate the filters (channels) along the manifold. The manifold forms a phase shifter between each channel which is sufficient to compensate for filter interactions to thereby permit the design of contiguous or non-contiguous channel multiplexers. Design procedures are described for both a frequency independent manifold and a frequency dependent manifold. One design is of a waveguide WR229 manifold triplexer employing 37 MHz bandwidth 6-cavity Chebyshev filters having ripple return loss of 26dB (VSWR=1.1) with center frequencies at 3720, 3800 and 3880 MHz.
REFERENCES:
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patent: 2816270 (1957-12-01), Lewis
patent: 2938177 (1960-05-01), Vogelman
patent: 3121847 (1964-02-01), Pakan
patent: 3895190 (1975-07-01), Koob
IEEE Transactions on Microwave Theory . . . ; vol. MTT-18, No. 5, May 1970; "Input Manifolds for Microwave Channel Zink Filter", by Edson et al., pp. 270-276.
Comsat Technical Review; vol. 6, No. 2, Fall 1976; "A Contigous Band Multiplexer" by Chen et al.
1976 IEEE MTT-S Int'l Microwave Symposium Digest, IEEE Cat. No. 76Ch1087-GMTT, "Narrow Band Contigous Multiplexer Filters . . ." by Wenzel et al.
IEEE Transactions on Microwave Theory and Techniques; vol. MTT-25, No. 10, Oct. 1977; "Direct Design Formulas . . ." by Haine et al.
Microwaves, Optics and Acoustics; Sep. 1976; vol. 1, No. 1; "Direct Design of Symetrical Interacting Bandpass Channel Diplexers" by Rhodes.
Levy Ralph
Rhodes John D.
Microwave Development Labs. Inc.
Stewart David L.
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