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Class Information
Number: 333/207
Name: Wave transmission lines and networks > Coupling networks > Wave filters including long line elements > Coaxial > Tunable
Description: Subject matter wherein the filter structure includes electrically or mechanically variable parameters to provide an adjustable amplitude versus frequency characteristic.










Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8710941 High-order harmonic device of cavity filter Apr. 29, 2014
8324989 Re-entrant resonant cavities and method of manufacturing such cavities Dec. 4, 2012
8294536 Cavity filter with a slider Oct. 23, 2012
8179212 Frequency tunable filter May. 15, 2012
8154363 Band pass filter with tunable phase cancellation circuit Apr. 10, 2012
8149074 Tuning element and tunable resonator Apr. 3, 2012
8115574 Low pass filter with embedded resonator Feb. 14, 2012
8085118 Inline cross-coupled coaxial cavity filter Dec. 27, 2011
8072294 Filter having switch function and band pass filter Dec. 6, 2011
8072298 Radio frequency filter Dec. 6, 2011
8010055 Method and apparatus for RF communication system signal to noise ratio improvement Aug. 30, 2011
7969260 Variable radio frequency band filter Jun. 28, 2011
7861398 Method for fabricating a miniature tunable filter Jan. 4, 2011
7847659 Coaxial metamaterial structure Dec. 7, 2010
7825753 Variable radio frequency band filter Nov. 2, 2010
7804385 Composite resonator for use in tunable or fixed filters Sep. 28, 2010
7777593 High frequency filter with blocking circuit coupling Aug. 17, 2010
7728700 High frequency filter in a coaxial construction, in particular in the manner of a high frequency separating filter (for example a duplex separating filter) or a bandpass filter or band-stop f Jun. 1, 2010
7688059 Filter characteristic adjusting apparatus and filter characteristic adjusting method Mar. 30, 2010
7612637 Built-in cross-coupled dielectric filter Nov. 3, 2009
7463121 Temperature compensating tunable cavity filter Dec. 9, 2008
7449981 Variable radio frequency band filter Nov. 11, 2008
7439828 Tunable filter, duplexer and communication apparatus Oct. 21, 2008
7405637 Miniature tunable filter having an electrostatically adjustable membrane Jul. 29, 2008
7388458 DC extracting arrangement and a filter Jun. 17, 2008
7348869 Adjustable coaxial filter device with axially adjustable inner conductor Mar. 25, 2008
7236069 Adjustable resonator filter Jun. 26, 2007
7180391 Resonator filter Feb. 20, 2007
7075388 Ceramic RF triplexer Jul. 11, 2006
7068128 Compact combline resonator and filter Jun. 27, 2006
6995636 In-band-flat-group-delay type dielectric filter and linearized amplifier using the same Feb. 7, 2006
6977565 Dielectric filter Dec. 20, 2005
6970058 L-C type filter module and helical filter made up of at least two such modules Nov. 29, 2005
6936559 Tunable devices incorporating cacu3ti4o12 Aug. 30, 2005
6922120 Dielectric filter, duplexer dielectric filter, and method for manufacturing the same Jul. 26, 2005
6903633 Electronic tunable filters with dielectric varactors Jun. 7, 2005
6895190 Switchable bandwidth lowpass filter May. 17, 2005
6885261 Dielectric filter, antenna sharing device, and communication device having a voltage controlled reactance element for tuning the center frequency Apr. 26, 2005
6879222 Reduced length metallized ceramic duplexer Apr. 12, 2005
6873225 Diplexers with low pass filter having distributed and non-distributed (lumped) elements Mar. 29, 2005
6861929 Low-pass filter Mar. 1, 2005
6836198 Adjustable capacitive coupling structure Dec. 28, 2004
6809612 Dielectric block signal filters with cost-effective conductive coatings Oct. 26, 2004
6801104 Electronically tunable combline filters tuned by tunable dielectric capacitors Oct. 5, 2004
6765457 Dielectric filter, dielectric duplexer, and communication device having elongated through holes Jul. 20, 2004
6750730 Tuning arrangement for a microwave device Jun. 15, 2004
6750733 Coupled resonator filter tuning having inter-resonator interaction compensation Jun. 15, 2004
6734765 Dielectric filter, dielectric duplexer, and communications equipment May. 11, 2004
6731186 Composite dielectric filter device and communication apparatus incorporating the same May. 4, 2004
6694601 Method of adjusting characteristics of dielectric filter Feb. 24, 2004

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