Spiral hybrid coupler

Details Spiral hybrid coupler Spiral hybrid coupler

1988-02-09

1989-01-24

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333116, H01P 518

Patent

active

048003450

ABSTRACT:
The disclosed coupler is in a spiral form having approximately 11/4 turns and a length of just over 1/4 wavelength of a designed frequency. The coil includes an interdigitated section with two conductor portions for each conductor. In the overlapped turn portion, the inner conductors are narrower than the outer conductor. Further, conductor pads are disposed adjacent the coupler conductors for connection to associated couplers to vary the bandwidth of the coupler.

REFERENCES:
patent: 3162717 (1964-12-01), Lentz
patent: 3332039 (1967-07-01), Oh
patent: 3516024 (1970-06-01), Lange
patent: 4636754 (1987-01-01), Presser et al.
Lange, "Interdigitated Strip-Line Quadrature Hybrid" MTTS Digest of Technical Papers, pp. 10-13, May 5, 1969, U.S. Pat. No. 3,516,024.
Kemp et al., "Ultra-Wide Band Quadrature Coupler," Electronics Letters, vol. 19, No. 6, pp. 197-199, Mar. 17, 1983, U.S. Pat. No. 3,516,024.
Shibata, et al., "Microstrip Spiral Directional Coupler," IEEE Transations on Microwave Theories and Techniques, vol. MTT29, No. 7, pp. 680-689, Jul. 1981.

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