Transmission line switch

Details Transmission line switch Transmission line switch

1989-06-27

1990-09-25

Gensler, Paul

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

307243, 307571, 330295, 333104, 455 3, H04B 118, H01P 115

Patent

active

049598732

ABSTRACT:
A transmission line switch allows a single output line (3) to be switched to one of two or more input lines (1,2) to which it is permanently connected at a common junction (4). Each input line (1,2) has an associated amplifier stage (10) which can be biased in a normal high gain (`on`) state, or in an isolation (`off`) state. Suitable biasing in the `off` state ensures that the amplifier stage output presents a low impedance to its own input line, the length (L) of which is chosen to reflect a high impedance at the junction (4) with the other lines. Correct design enables the return loss and insertion loss of the `on` path to be kept to low values while simultaneously offering a high insertion loss to the `off` path signals.

REFERENCES:
patent: 4399439 (1983-08-01), Upadhyayula
patent: 4472691 (1984-09-01), Kumar et al.
patent: 4626806 (1986-12-01), Rosar et al.
patent: 4803443 (1989-02-01), Takagi et al.
patent: 4897563 (1990-01-01), Bahl
Extract from "Microwave Field Effect Transistors-Theory, Design and Applications", by R. S. Pengelly.

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