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Class Information
Number: 333/174
Name: Wave transmission lines and networks > Coupling networks > Frequency domain filters utilizing only lumped parameters > With variable response
Description: Subject matter wherein at least one of the filter parameters is made adjustable in order to vary the response of the filter.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7598838 |
Variable inductor technique |
Oct. 6, 2009 |
| 7589604 |
Selectable notch filter |
Sep. 15, 2009 |
| 7586385 |
Method and apparatus for varying an impedance |
Sep. 8, 2009 |
| 7548136 |
Distortion reduction for variable capacitance devices |
Jun. 16, 2009 |
| 7511596 |
Dual bandpass filter having serial configuration of coupled-line filters |
Mar. 31, 2009 |
| 7492240 |
Integrated capacitor and inductor |
Feb. 17, 2009 |
| 7446631 |
Radio frequency inductive-capacitive filter circuit topology |
Nov. 4, 2008 |
| 7443267 |
Low-pass filter and low-pass filter array |
Oct. 28, 2008 |
| 7400868 |
Automatic tuning apparatus for filter and communication instrument |
Jul. 15, 2008 |
| RE40292 |
Bandpass filter |
May. 6, 2008 |
| 7352261 |
Production method for chip-form film-forming component |
Apr. 1, 2008 |
| 7339446 |
Tunable resonator with MEMS element |
Mar. 4, 2008 |
| 7323955 |
Narrow-band absorptive bandstop filter with multiple signal paths |
Jan. 29, 2008 |
| 7259643 |
Tunable wideband bandpass filter, tunable multi-band bandpass filter using the same, and methods therefore |
Aug. 21, 2007 |
| 7227431 |
Variable matching circuit, variable resonance circuit, variable phase-shifting circuit and variable attenuation circuit each having variable-capacitance capacitor |
Jun. 5, 2007 |
| 7202768 |
Tunable inductor |
Apr. 10, 2007 |
| 7183880 |
Discrete inductor bank and LC filter |
Feb. 27, 2007 |
| 7145415 |
Electrically tunable filters with dielectric varactors |
Dec. 5, 2006 |
| 7117025 |
Varactor tuning for a narrow band filter |
Oct. 3, 2006 |
| 7106149 |
Switchable tuneable bandpass filter with optimized frequency response |
Sep. 12, 2006 |
| 7102465 |
Frequency discrete LC filter bank |
Sep. 5, 2006 |
| 7085122 |
MEMS tunable capacitor based on angular vertical comb drives |
Aug. 1, 2006 |
| 7064557 |
Calibration circuit and method for filter bandwidth which is parasitic capacitance sensitive or insensitive |
Jun. 20, 2006 |
| 7057452 |
Method and circuit for correcting the offset of an amplification chain |
Jun. 6, 2006 |
| 7049902 |
Tunable high-order bessel low pass filter |
May. 23, 2006 |
| 7034636 |
Tunable filters having variable bandwidth and variable delay |
Apr. 25, 2006 |
| 7015774 |
Noise filter and electronic apparatus having the same |
Mar. 21, 2006 |
| 7012483 |
Tunable bridge circuit |
Mar. 14, 2006 |
| 7002417 |
RC and SC filter compensation in a radio transceiver |
Feb. 21, 2006 |
| 7002427 |
Filter trimming |
Feb. 21, 2006 |
| 7002435 |
Variable capacitance circuit, variable capacitance thin film capacitor and radio frequency device |
Feb. 21, 2006 |
| 6982614 |
Multi-mode filter |
Jan. 3, 2006 |
| 6975187 |
Continuously tunable waveguide filter |
Dec. 13, 2005 |
| 6965275 |
Method and apparatus for tuning a filter |
Nov. 15, 2005 |
| 6954115 |
Methods and apparatus for tuning successive approximation |
Oct. 11, 2005 |
| 6924716 |
Method and apparatus for reduction of electromagnetic feed through in a SAW filter |
Aug. 2, 2005 |
| 6909344 |
Band switchable filter |
Jun. 21, 2005 |
| 6898450 |
High temperature superconducting tunable filter with an adjustable capacitance gap |
May. 24, 2005 |
| 6895190 |
Switchable bandwidth lowpass filter |
May. 17, 2005 |
| 6894580 |
Filter tuner system and method |
May. 17, 2005 |
| 6888422 |
Continuously variable filter |
May. 3, 2005 |
| 6888430 |
Integrated radiofrequency circuit component having a trimming diode controlled by a trimming voltage provided by a D/A converter |
May. 3, 2005 |
| 6882245 |
Frequency discrete LC filter bank |
Apr. 19, 2005 |
| 6882246 |
System and method for an electronically tunable frequency filter having constant bandwidth and temperature compensation for center frequency, bandwidth and insertion loss |
Apr. 19, 2005 |
| 6867666 |
Variable filter using fluid dielectric |
Mar. 15, 2005 |
| 6864759 |
Rotary signal coupler |
Mar. 8, 2005 |
| 6829132 |
Charge control of micro-electromechanical device |
Dec. 7, 2004 |
| 6801103 |
Noise filter |
Oct. 5, 2004 |
| 6801102 |
Tunable filters having variable bandwidth and variable delay |
Oct. 5, 2004 |
| 6791430 |
Resonator tuning assembly and method |
Sep. 14, 2004 |
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