Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Patent
1982-11-01
1984-09-11
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
333161, 333246, H01P 118, H01P 1185
Patent
active
044713304
ABSTRACT:
A digital phase bit is provided for microwave operation, comprising a pair of FET switches and at least three transmission lines. The FETs when operated in a digital switching mode, present a small impedance when on and a high impedance when off. Each of two of the transmission lines exhibits a series inductive impedance over the operating frequency band and shunts a FET switch, two shunt combinations being interconnected by the third transmission line. When the switches are on, the signal path is effectively through the FET switch alone (and not branched) and a reference phase shift is produced. When the FET switches are off, a signal applied to the phase bit branches at each shunt combination. The inductive reactance of the transmission line and the capacitive reactance of the FET switch of each shunt combination then jointly produce a resonantly enhanced reactance over the band, causing a reflection and a maximum differential phase shift. The reflections are cancelled at the input port by a suitable choice of length and impedance for the third transmission line. The phase bit is suitable for monolithic fabrication on a common semiconductor substrate and is bidirectional when symmetrical FET switches are used.
REFERENCES:
patent: 3491314 (1970-01-01), White
patent: 3568097 (1971-03-01), Hyltin
patent: 4056792 (1977-11-01), Horwitz et al.
Kong Wendell M.
Naster Ronald J.
Nelson Conrad E.
Windyka John A.
Baker Carl W.
General Electric Company
Lang Richard V.
Nussbaum Marvin L.
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