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Class Information
Number: 333/133
Name: Wave transmission lines and networks > Plural channel systems > Having branched circuits > For providing frequency separation > Utilizing electromechanical transducer
Description: Subject matter wherein an electrical wave driven mechanical vibrator determines the frequency characteristic of the branched circuit.










Patents under this class:
1 2 3 4 5 6 7 8 9 10 11

Patent Number Title Of Patent Date Issued
5936483 Surface acoustic wave device with two filters each having capacitive impedance in the other's passband Aug. 10, 1999
5936488 Surface acoustic wave filter having input and output transducers with different aperture lengths Aug. 10, 1999
5910756 Filters and duplexers utilizing thin film stacked crystal filter structures and thin film bulk acoustic wave resonators Jun. 8, 1999
5905449 Radio switching apparatus May. 18, 1999
5905418 Surface-acoustic-wave filters with poles of attenuation created by impedance circuits May. 18, 1999
5864260 Monolithic saw duplexer Jan. 26, 1999
5854579 Saw filter using low-pass configuration and method of providing the same Dec. 29, 1998
5786738 Surface acoustic wave filter duplexer comprising a multi-layer package and phase matching patterns Jul. 28, 1998
5726610 Saw filter device for radio tranceiver utilizing different coupling coefficient ratios Mar. 10, 1998
5708402 Surface acoustic wave device improved in convolution efficiency, receiver using it, communication system using it, and method for producing surface acoustic wave device improved in convoluting Jan. 13, 1998
5631612 Surface acoustic wave filter May. 20, 1997
5561406 Duplexer package Oct. 1, 1996
5554960 Branching filter, branching filter module and radio commnication apparatus Sep. 10, 1996
5515015 Transceiver duplex filter utilizing saw filter May. 7, 1996
5483369 Communication systems using passive RF routing Jan. 9, 1996
5473295 Saw notch filter for improving stop-band attenuation of a duplex filter Dec. 5, 1995
5467065 Filter having resonators coupled by a saw filter and a duplex filter formed therefrom Nov. 14, 1995
5332983 Filterbank using surface acoustic wave technology Jul. 26, 1994
5202652 Surface acoustic wave filter device formed on a plurality of piezoelectric substrates Apr. 13, 1993
5194836 Thin film, microwave frequency manifolded filter bank Mar. 16, 1993
5185589 Microwave film bulk acoustic resonator and manifolded filter bank Feb. 9, 1993
5179309 Surface acoustic wave chirp filter Jan. 12, 1993
5130681 Saw filter and mobile telephone using same Jul. 14, 1992
5057800 Apparatus and method for diffracting MSW in a garnet film using SAW Oct. 15, 1991
4954793 Filter bank Sep. 4, 1990
4952833 High density surface acoustic waveguide channelizer Aug. 28, 1990
4947073 Saw channelized filters Aug. 7, 1990
4827229 Broad band bulk acoustic wave spectrum analyzer/channelizer May. 2, 1989
4749971 Saw delay line with multiple reflective taps Jun. 7, 1988
4639695 Wideband saw channellizer using slanted array input transducer Jan. 27, 1987
4614919 Magnetostatic wave frequency analyzer apparatus Sep. 30, 1986
4514684 Acoustic waveguide voltage monitor Apr. 30, 1985
4422057 Surface wave filter with reduced substrate size Dec. 20, 1983
4379274 Acoustic surface wave multiplexing filter Apr. 5, 1983
4320366 Carrier frequency communication transmission system having premodulation Mar. 16, 1982
4281299 Signal isolator Jul. 28, 1981
4227156 Circuit for at least two frequencies Oct. 7, 1980
3986151 Electromechanical branching filter Oct. 12, 1976
3942140 Method and means for coupling a multiplicity of surface acoustic wave transducers to a single electromagnetic wave transmission line Mar. 2, 1976

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