Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
2005-04-19
2005-04-19
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
C333S175000, C333S017100
Reexamination Certificate
active
06882246
ABSTRACT:
A novel system and method for a frequency tunable filter is described. The inventive system and method may be used, for example, in multi-band cellular phones and/or transceivers in wireless networks. The inventive system and method avoids the creation of undesired spurs thus minimizing design difficulties and obviating the need for complex multiple frequency conversions and the associated deleterious effects on performance. The inventive system and method provides at an output terminal an output signal at one of a plurality of predetermined frequencies. The inventive system and method comprises input circuitry for providing an input signal that is at least in part a function of a dynamic parameter, a processor for providing a control signal as a function of said input signal, and at least one adjustable resonance circuit capable of providing a filter signal at one of a plurality of predetermined frequencies in response to said control signal, wherein said filter signal is applied to said output terminal to thereby provide said output signal at one of a plurality of predetermined frequencies. The present inventive system and method also provides for reducing spurious signals from a composite signal created from mixing a plurality of signals by filtering the composite signal.
REFERENCES:
patent: 5917387 (1999-06-01), Rice et al.
patent: 6094588 (2000-07-01), Adam
patent: 6160460 (2000-12-01), Hicks et al.
patent: 6518859 (2003-02-01), Spampinato
International Search Report for International Application No. PCT/US03/40636.
Marquardt Gregory H.
Offner James B.
Duane Morris LLP
Harris Corporation
Pascal Robert
Takaoka Dean
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