Contiguous channel multiplexer/demultiplexer

Details Contiguous channel multiplexer/demultiplexer Contiguous channel multiplexer/demultiplexer

1986-09-22

1989-06-13

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

333126, 333135, 342196, 364726, 364827, 370 70, H04B 900

Patent

active

048398942

ABSTRACT:
A multiplexer/demultiplexer for combining/separating a large number of contiguous frequency channels in microwave bands while incurring low insertion loss. The invention, in a demultiplexer mode, includes a power divider, to form a multiplicity of samples of an input signal; delay lines to non-dispersively differentially delay the samples in accordance with a first arithmetic progression; phase shifters to add fixed phase shifts to samples in accordance with a second arithmetic progression; and a Butler matrix to coherently combine the samples selectively at different output ports for different input signal frequencies. In a multiplexer mode, input signals are applied to the Butler matrix. The Butler matrix, phase shifters, delay lines, and power divider perform in reverse of the demultiplexer mode (the power divider thus performing as a power combiner). The present invention minimizes insertion loss by eliminating any requirement for resonators and any means for isolating resonators.

REFERENCES:
patent: 3710281 (1973-01-01), Thomas
patent: 3971922 (1976-07-01), Bellanger et al.
patent: 4652879 (1987-03-01), Rudish et al.
Takahata et al--Development of a TDM/FDM Transmultiplexer--IEEE Trans. on Comm., vol. COM-26, #5, May 1978, pp. 726-733.

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