Automatically controlled varactor tuned matching networks for a

Details Automatically controlled varactor tuned matching networks for a Automatically controlled varactor tuned matching networks for a

1991-07-05

1993-06-01

Pascal, Robert J.

Wave transmission lines and networks

Automatically controlled systems

Impedance matching

333 32, 333188, H03H 1130, H03H 956

Patent

active

052163920

ABSTRACT:
A crystal filter network comprises at least one variable impedance network (103a, 103b), at least one crystal filter (103c), and a control circuit (110). Each variable impedance network (103a, 103b) has a control terminal, a first terminal (37, 39), and a second terminal (38, 40) for connecting a first impedance (113) coupled to the first terminal (37), to a second impedance coupled to the second terminal (38). The crystal filter (103c) is coupled to at least one of the first and second terminals. Coupled to the control terminal, the control circuit (110) electrically varies (V.sub.1 and V.sub.2) the variable impedance network (103a, 103b) to provide a predetermined impedance characteristic to the crystal filter network (103c).

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