Controllable filter and high frequency apparatus using the same

Details Controllable filter and high frequency apparatus using the same Controllable filter and high frequency apparatus using the same

1998-10-15

2000-07-04

Bettendorf, Justin P.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333176, 334 15, H03H 1104, H03H 712

Patent

active

060844868

ABSTRACT:
A filter comprises an inductor, a first variable capacitance diode, a second variable capacitance diode having nearly identical characteristic as the first variable capacitance diode, a control terminal for applying voltage to the first and the second variable capacitance diodes, an input terminal, an output terminal and a signal line between the input terminal and the output terminal. A cutoff frequency is controllable with the voltage applied to the control terminal. The variable frequency filter which can receive a large signal has reduced size due to a structure in which the first and the second variable capacitance diodes having nearly identical characteristics are connected either in series or in parallel with their polarities reversed against each other.

REFERENCES:
patent: 4646360 (1987-02-01), Muterspaugh
patent: 5065453 (1991-11-01), Thomas
patent: 5291159 (1994-03-01), Vale
patent: 5379008 (1995-01-01), Bockelman et al.
patent: 5541558 (1996-07-01), Weber et al.

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