Chong D Lee

US Patent:

D676912, Feb 26, 2013

Filed:

Apr 10, 2012

Appl. No.:

29/417852

Inventors:

Chong Yul Lee - Garnet Valley PA, US

International Classification:

2102

US Classification:

D21757

US Patent:

39965333, Dec 7, 1976

Filed:

Jul 7, 1975

Appl. No.:

5/593904

Inventors:

Chong W. Lee - Lexington MA

International Classification:

H01P 110

US Classification:

333 7R

Abstract:

A basic electrical switch for switching alternating (frequency) electrical signals between four symmetrical switching terminals generates, in response to command signals, any of a plurality of switch patterns which provide simultaneous transmission paths between terminals of different pairs and isolation between terminals of different pairs. The switch consists of four hybrid couplers and four reflection-type phase shifters, which are arranged so that the input signal to a coupler is divided equally into two parts, each of which undergoes proper phase shifts by the command signals to emerge from the desired output terminal, either in phase for transmission or out of phase for isolation of the signal. Within each switching state, the signal can also be controlled in biphase by the command signals. The terminals are matched to the characteristic impedance of the switch under any switching state and so, a plurality of such basic electrical switches can be connected at their terminals to provide an "M. times.