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Class Information
Number: 333/110
Name: Wave transmission lines and networks > Plural channel systems > Having branched circuits > Using directional coupler > For providing frequency separation
Description: Subject matter wherein the interchange of energy results in the separation or combination of a plurality of frequencies or frequency bands.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8686808 Band combining filter Apr. 1, 2014
8611845 Enhanced flexibility coupler for RF power detection and control Dec. 17, 2013
8451175 Advanced active metamaterial antenna systems May. 28, 2013
8384494 Multiband coupling circuit Feb. 26, 2013
8305164 Frequency-agile frequency-selective variable attenuator Nov. 6, 2012
8238472 Carrier separation frequency error adjustment for UL multiple carrier operation Aug. 7, 2012
8228135 Band combining filter Jul. 24, 2012
8022787 Duplexer, module including a duplexer and communication apparatus Sep. 20, 2011
8020130 Timing analysis apparatus and method for semiconductor integrated circuit in consideration of power supply and ground noises Sep. 13, 2011
7623005 Filter combiner Nov. 24, 2009
7538634 Frequency diplexer with an input port and a first and a second output ports May. 26, 2009
7482893 Power combiners using meta-material composite right/left hand transmission line at infinite wavelength frequency Jan. 27, 2009
7323955 Narrow-band absorptive bandstop filter with multiple signal paths Jan. 29, 2008
7321276 Independently adjustable combined harmonic rejection filter and power sampler Jan. 22, 2008
7321277 Waveguide directional filter Jan. 22, 2008
7088089 Power detector with constant voltage decoupling Aug. 8, 2006
7034632 Multi-tuner receivers with cross talk reduction Apr. 25, 2006
7027778 Radio frequency switching apparatus and mobile telecommunication terminal using the same Apr. 11, 2006
7012479 Filter circuit and transmitter and receiver using the same Mar. 14, 2006
6917260 Waveguide directional filter Jul. 12, 2005
6822531 Switched-frequency power dividers/combiners Nov. 23, 2004
6781476 Filter having directional coupler and communication device Aug. 24, 2004
6714096 Waveguide directional filter Mar. 30, 2004
6507251 Dual-mode band-pass filter Jan. 14, 2003
6150898 Low-pass filter with directional coupler and cellular phone Nov. 21, 2000
6046654 Quasi-gaussian filter Apr. 4, 2000
5930266 Multiplexing/demultiplexing an FDM of RF signal channels Jul. 27, 1999
5838527 Electrical surge protection apparatus Nov. 17, 1998
5729824 Distributed digital loop carriers system using coaxial cable Mar. 17, 1998
5673010 Power distributor system and power distributor for microwave signals having recurring hierarchical structure of distributor elements and coupler elements Sep. 30, 1997
5278529 Broadband microstrip filter apparatus having inteleaved resonator sections Jan. 11, 1994
5235297 Directional coupling manifold multiplexer apparatus and method Aug. 10, 1993
5184098 Switchable dual mode directional filter system Feb. 2, 1993
5124674 Lumped element directional filter Jun. 23, 1992
5055807 Method and apparatus for multiplexing broad band high frequency signals for use in network analyzers Oct. 8, 1991
5053733 Method and apparatus for multiplexing broad band high frequency signals for use in network analyzers Oct. 1, 1991
5023935 Combined multi-port transmit/receive switch and filter Jun. 11, 1991
4905239 R. F. signal distribution Feb. 27, 1990
4847574 Wide bandwidth multiband feed system with polarization diversity Jul. 11, 1989
4777457 Directional coupler for separation of signals in two frequency bands while preserving their polarization characteristics Oct. 11, 1988
4714903 Dielectric resonator directional filter Dec. 22, 1987
4706049 Dual adjacent directional filters/combiners Nov. 10, 1987
4668953 Electrical power dividers May. 26, 1987
4660005 High frequency electrical network Apr. 21, 1987
4573213 Dual Gunn diode self-oscillating mixer Feb. 25, 1986
4567401 Wide-band distributed rf coupler Jan. 28, 1986
4531105 Frequency multiplier circuit for producing isolated odd and even harmonics Jul. 23, 1985
4483583 Selective directional coupler for guided waves Nov. 20, 1984
4433314 Millimeter wave suspended substrate multiplexer Feb. 21, 1984
4426630 Electronically tunable band reject filter Jan. 17, 1984

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