Apparatus and method for improving channel filter...

Details Apparatus and method for improving channel filter... Apparatus and method for improving channel filter...

2008-12-29

2011-12-06

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S167000, C333S202000

Reexamination Certificate

active

08072297

ABSTRACT:
A controllable filter arrangement with a voltage controlled device that subjects a signal to a predetermined impedance as part of the filtering process when the voltage controlled device is in an active state. In an inactive state, the voltage controlled device may subject the signal to an impedance that prevents all frequencies of the signal from passing. This configuration may advantageously increase frequency selectivity and reduce insertion loss, size, cost, and tuning complexity when compared with conventional filter designs.

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International Search Report & Written Opinion—PCT/US2009/069617, International Search Authority—European Patent Office Mar. 4, 2010.
Ruiperez M S., et al., “Fast Electronically Tunable Filter Bank” Military Communications Conference, 2005. Milcom 2005. IEEE Atlantic City, NJ, USA Oct. 17-20, 2005, Piscataway, NJ, USA,IEEE, Piscataway, NJ, USA, Oct. 17, 2005, pp. 1-4, XP010901577 ISBN: 978-0-7803-9393-6 p. 1, left-hand column, line 29—right-hand column, line 21; figure 1 p. 2, left-hand column, line 8—right-hand column, line 28 p. 3, left-hand column, line 8—line 16.

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