Satellite communications system with the zero-db coupler

Details Satellite communications system with the zero-db coupler Satellite communications system with the zero-db coupler

1992-02-12

1993-12-28

Lee, Benny T.

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

333113, 333117, 370 75, H04B 159

Patent

active

052748391

ABSTRACT:
A zero-dB hybrid or directional coupler includes a first through waveguide extending between first and third ports and a second through waveguide, parallel to the first waveguide, and extending between second and fourth ports. A plurality of branch waveguides extend between the first and second through waveguides, and are adjusted to couple signal from the first port only to the fourth port, and from the second port only to the third port (within in limits of systems isolation). Particular normalized branch line impedances provide best operation. A communication system especially adapted for use as a spacecraft uses a zero-dB coupler in a "planar" waveguide system to transpose or "crossover" the positions of two system ports, whereby the physical positions of the various ports are arranged in the same relation as their phase progression.

REFERENCES:
patent: H880 (1991-01-01), Patin
patent: 3044026 (1962-07-01), Patterson
patent: 4706239 (1987-11-01), Ito et al.
patent: 4872015 (1989-10-01), Rosen
patent: 4906952 (1990-03-01), Praba et al.
patent: 4989011 (1991-01-01), Rosen et al.
patent: 5025485 (1991-06-01), Csongor et al.
"Beam Forming Networks for Satellite Applications", by Praba et al., pp. 57-59, 5th Annual Benjamin Franklin Symposium, May 24, 1985.
Reed, John; "Branch Waveguide Coupler Design Charts"; The Microwave Journal; Jan. 1963; pp. 103-105; Copy in 333/113.

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