Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Patent
1993-04-15
1994-08-02
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
333156, 333109, H01P 118
Patent
active
053349598
ABSTRACT:
An improved 180.degree. phase shifter bit that uses embedded switches to selectively connect the RF input and RF output to a loosely coupled transmission line segment and a pi section of transmission line. A hybrid coupler is selected having characteristic impedance of less than 50 ohms and having coupling of less than -3 db. The result of this coupling choice is extremely low insertion loss. The resultant impedance mismatch is compensated for by providing oversized field effect transistors that allow RF signal in both the grounded coupler and the pi section of transmission lines that are 180.degree. out of phase. The RF signal present in both the coupler and pi section of the transmission line results in a cancellation effect allowing recovery of the input/output impedance over an approximately one octave bandwidth.
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Chan David W.
Krafcsik David M.
Ham Seungsook
LeDonne Eugene
Westinghouse Electric Corporation
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