Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1990-11-15
1992-07-21
Pascal, Robert J.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333112, 333116, 333120, H01P 522
Patent
active
051326450
ABSTRACT:
A four-port wide-band branch line coupler which distributes, to two output ports and over a wide bandwidth, a signal that is fed into an input port at any constant ratio with a phase difference of 90.degree., so that no power emanates from an isolated port. If a signal is fed into the isolated port, this power is also distributed to both output ports, so that no power emanates from the input port. The coupler has two identical rings consisting of quarter-wave length line sections that are connected by two half-wave length line sections and are connected, by series circuits made of half-wave length line sections with individual branch circuits connected in parallel to them, to the four ports. The circuit can be dimensioned for construction in microstrip technology or coaxial cable technology. Further, the circuit can be made of concentrated elements so that it can be used in microwave monolithic integrated circuits.
REFERENCES:
patent: 3731217 (1973-05-01), Gerst et al.
patent: 4127831 (1978-11-01), Riblet
patent: 4305043 (1981-12-01), Ho et al.
patent: 4371982 (1983-02-01), Hallford
patent: 4893098 (1990-01-01), Seely et al.
Patin, U.S. Statutory Invention Registration, Reg. No. H880, published Jan. 1, 1991, which filed on Feb. 28, 1989.
Paul et al., "Broadband Branchline Coupler for S Band", Elec. Letters, vol. 28, No. 15, Jul. 18, 1991, pp. 1318, 1319.
Ham Seung
Pascal Robert J.
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