Bidirectional switch

Details Bidirectional switch Bidirectional switch

1983-10-24

1985-02-26

Laroche, Eugene R.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333104, 333164, 333161, 455 5, 307241, H01P 115

Patent

active

045020272

ABSTRACT:
A bidirectional switch for selectively switching a microwave frequency signal between one of two signal paths. The switch includes a pair of field effect transistors, and a pair of transmission lines coupled together at one end thereof to provide a common port. Each second end of each microwave transmission line is coupled to a drain electrode of one of such field effect transistors to provide a branch port at each second end of each microwave transmission line. The electrical lengths of each transmission line are selected in accordance with the operating wavelength of the circuit to provide an impedance corresponding to an open circuit at one end, when a short circuit is provided at the opposite end. A signal is coupled between the common port and a selected one of the branch ports, in response to a pair of complementary binary control signals fed to the gate electrodes of the FETs. The control signals are used to select between one of the two signal paths by placing the FET having the drain electrode coupled to a selected branch port in a nonconducting state, and by placing the FET having the drain electrode coupled to an unselected branch port in a conducting state.

REFERENCES:
patent: 2974188 (1961-03-01), Diambra
patent: 3027524 (1962-03-01), May, Jr.
patent: 3934173 (1976-01-01), Korver
patent: 3996533 (1976-12-01), Lee
patent: 4034316 (1977-07-01), Bex
patent: 4041389 (1977-08-01), Oades
patent: 4056792 (1977-11-01), Horwitz et al.
patent: 4205282 (1980-05-01), Gipprich

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