Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1984-10-31
1987-01-13
La Roche, Eugene R.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333238, H01P 518
Patent
active
046367543
ABSTRACT:
A four-port folded interdigitated coupler has two short conductive strips and three full length conductive strips disposed between the short strips. The full length strips are 1/4 wavelength long at a design frequency. The sum of the lengths of the short strips is 1/4 wavelength at that design frequency. The ends of the short strips remote from the ports are connected together and to the center one of the three full length strips by conductive jumpers. In one embodiment the two full length strips which are not connected to the short strips are connected by a conductive jumper at substantially the same longitudinal position as the jumpers which connect the ends of the two short strips. In this embodiment, the two short strips may have equal lengths or they may have unequal lengths. When their lengths are unequal, their jumpers and the associated jumper between the two outer full length strips are positioned off-center with respect to the longitudinal length of the full length strips. With the short strips having unequal lengths, the jumper between the two full length strips may be omitted. In another embodiment, the short strips have unequal lengths and no jumper connects the outer full length strips at the longitudinal position of the short strip jumpers.
REFERENCES:
patent: 3208003 (1965-09-01), Sterzer
patent: 3516024 (1970-06-01), Lange
patent: 4178568 (1979-12-01), Gunton
patent: 4211986 (1980-07-01), Tajima
"Interdigitated Microstrip Coupler Design", By: A. Presser, IEEE Transactions on Microwave Theory and Techniques, vol., MTT-26, No. 10, Oct. 1978, pp. 801-805.
Kumar et al, "Monolithic GaAs Interdigitated 90.degree. Hybrids with 50- 25- Ohm Impedances", 1982 IEEE Microwaves & Millimeter Wave Circuits Symposium, Dallas, TX, 1982.
"Interdigitated Strip-Line Quadrature Hybrid", By: J. Lange G-MTT Int. Microwave Symposium Digest, pp. 10-13, May 1969.
"Interdigitated Stripline Quadrature Hybrid", By: J. Lane, IEEE Transactions on Microwave Theory and Techniques, Dec. 1969, pp. 1150-1151.
"Unfolding", The Lange Coupler, By: R. Waugh et al., IEEE Transactions on Microwave Theory and Techniques, Nov. 1972, MTT-20, pp. 777-779.
Perlow Stewart M.
Presser Adolph
La Roche Eugene R.
Lee Benny T.
Ochis Robert
RCA Corporation
Tripoli Joseph S.
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