Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1996-09-27
1999-06-29
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333175, H03H 700
Patent
active
059173874
ABSTRACT:
In an RF filter having an input terminal, an output terminal, a plurality of resonator elements, and a plurality of coupling reactances for coupling one resonator element to another resonator element, for coupling the input terminal to a resonator element, and for coupling the output terminal to a resonator element, techniques are disclosed for providing an RF filter having an electronically tunable center frequency and an electronically tunable bandwidth. According to a specific embodiment disclosed herein, a first shunt reactance is provided from the input terminal to ground, and a second shunt reactance is provided from the output terminal to ground. The values of the coupling reactances remain constant, while the values of the resonator elements, the first shunt reactance, and the second shunt reactance are tuned to provide a specified filter bandwidth and/or a specified center frequency. According to a further embodiment, such a tunable filter is fabricated on a physical substrate having a substantially constant dielectric constant per unit volume, and the coupling reactances include capacitors fabricated using the physical substrate.
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"A VHF Switched-Capacitor Band-Pass Filter Using GaAs MESFET IC Technology", P. Katzin, et al., 1993 IEEE GaAS IC Symposium, Oct. 10-13, 1993, San Jose, CA, pp. 243-245.
Rice Christopher W.
Worstell Harry R.
Bartholomew Steven R.
Ham Seungsook
Lucent Technologies - Inc.
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