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Class Information
Number: 333/111
Name: Wave transmission lines and networks > Plural channel systems > Having branched circuits > Using directional coupler > For providing adjustable coupling
Description: Subject matter wherein the amount of electromagnetic energy transferred between the first and second transmission lines can be changed to provided a different coupling ratio.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8704575 Tunable active directional couplers Apr. 22, 2014
8611845 Enhanced flexibility coupler for RF power detection and control Dec. 17, 2013
8558640 Directional coupler Oct. 15, 2013
8422947 Communication device, high-frequency coupler, coupler electrode, and composite communication apparatus Apr. 16, 2013
8228136 Micro P-coupler Jul. 24, 2012
8203398 Measuring power Jun. 19, 2012
8020130 Timing analysis apparatus and method for semiconductor integrated circuit in consideration of power supply and ground noises Sep. 13, 2011
7859361 Directional coupler Dec. 28, 2010
7671700 Hollow waveguide directional coupler Mar. 2, 2010
7649429 Controlling coupling strength in electromagnetic bus coupling Jan. 19, 2010
7576625 Millimeter-band switching circuit Aug. 18, 2009
7538635 Quadrature hybrid circuit having variable reactances at the four ports thereof May. 26, 2009
7474172 Capacitively coupled variable power divider Jan. 6, 2009
7411470 Controlling coupling strength in electromagnetic bus coupling Aug. 12, 2008
7307492 Design, layout and method of manufacture for a circuit that taps a differential signal Dec. 11, 2007
7221239 Variable power divider May. 22, 2007
7212077 Device for transmitting signals between movable units May. 1, 2007
7183876 Variable coupling factor directional coupler Feb. 27, 2007
7151422 90.degree. hybrid Dec. 19, 2006
7109819 Device for wideband electrical connection of two units that are movable relative to each other Sep. 19, 2006
7098756 Arrangement and method for combining electric signals Aug. 29, 2006
7088198 Controlling coupling strength in electromagnetic bus coupling Aug. 8, 2006
7030713 Miniature high performance coupler Apr. 18, 2006
7015771 Directional coupler Mar. 21, 2006
6882244 Switching system for broadcast transmission Apr. 19, 2005
6825737 Device for broadband electrical signal transmission using a bi-directional transmission system Nov. 30, 2004
6788165 Variable power divider Sep. 7, 2004
6737934 Directional Coupler, antenna device, and transmitting-receiving device May. 18, 2004
6624722 Coplanar directional coupler for hybrid geometry Sep. 23, 2003
6476614 Detector for detecting frequencies in more than one band Nov. 5, 2002
6441699 Directional coupler, antenna device, and transmitting-receiving device Aug. 27, 2002
6359530 Switching waveguide directional coupler and method Mar. 19, 2002
6335662 Ferroelectric-tunable microwave branching couplers Jan. 1, 2002
6320477 Adjustable off-center coaxial coupler Nov. 20, 2001
6285266 Directional coupler having shiftable parallel dielectric transmission lines Sep. 4, 2001
6104240 Microwave circuit and method of manufacturing microwave circuit Aug. 15, 2000
6069529 Compact redundancy combiner assembly and method of operation thereof May. 30, 2000
5994977 High frequency signal directional coupling line Nov. 30, 1999
5949301 Controlling the direction of broadband energy flow through components in networking systems Sep. 7, 1999
5774026 High frequency impedance transformer Jun. 30, 1998
5661324 Relaxation oscillator using integrated RTC structure Aug. 26, 1997
5363071 Apparatus and method for varying the coupling of a radio frequency signal Nov. 8, 1994
5307030 Coupling adjustment of microwave slots Apr. 26, 1994
5281929 Microstrip twisted broadside coupler apparatus Jan. 25, 1994
5247268 Adjustable waveguide branch, and directional coupler Sep. 21, 1993
5218327 Variable/switchable coupler Jun. 8, 1993
5117202 Automatic level control circuit May. 26, 1992
5043684 Compact high power, high directivity, waveguide directional coupler utilizing reactively loaded junction Aug. 27, 1991
4998078 Dividing cascade network for a support station in a radio telephone network Mar. 5, 1991
4928077 Tunable microwave coupler with mechanically adjustable conductors May. 22, 1990

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