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Class Information
Number: 342/370
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Including a steerable array > Retrodirective
Description: Subject matter wherein a beam pattern is steered in the exact reverse direction of the direction of a received wave.










Patents under this class:

Patent Number Title Of Patent Date Issued
8466776 Extended range passive wireless tag system and method Jun. 18, 2013
8344943 Low-profile omnidirectional retrodirective antennas Jan. 1, 2013
8325089 Beamforming RF circuit and applications thereof Dec. 4, 2012
8284101 Retrodirective antenna systems Oct. 9, 2012
8134503 Open-loop beamforming MIMO communications in frequency division duplex systems Mar. 13, 2012
8120532 Beamforming RF circuit and applications thereof Feb. 21, 2012
8102313 Retroreflecting transponder Jan. 24, 2012
8072380 Wireless power transmission system and method Dec. 6, 2011
7944396 Retrodirective transmit and receive radio frequency system based on pseudorandom modulated waveforms May. 17, 2011
7834807 Retro-directive ground-terminal antenna for communication with geostationary satellites in slightly inclined orbits Nov. 16, 2010
7714781 Method and system for analog beamforming in wireless communication systems May. 11, 2010
7714780 Beamforming RF circuit and applications thereof May. 11, 2010
7663546 Real-time autonomous beam steering array for satellite communications Feb. 16, 2010
7545322 Antenna transceiver system Jun. 9, 2009
7482975 Multi-beam transmitting/receiving apparatus and transmitting/receiving method Jan. 27, 2009
7440766 Method for employing multipath propagation in wireless radio communications Oct. 21, 2008
7388540 Ad hoc large scale directional networks Jun. 17, 2008
7304607 Microwave self-phasing antenna arrays for secure data transmission and satellite network crosslinks Dec. 4, 2007
7142164 Low-loss reconfigurable reflector array antenna Nov. 28, 2006
7079816 On chip diversity antenna switch Jul. 18, 2006
7013165 Antenna array apparatus and beamforming method using GPS signal for base station in mobile telecommunication system Mar. 14, 2006
7006039 Microwave self-phasing antenna arrays for secure data transmission & satellite network crosslinks Feb. 28, 2006
6999724 Slowing the observed rate of channel fluctuations in a multiple antenna system Feb. 14, 2006
6903685 Passive tracking system and method Jun. 7, 2005
6861983 Method and apparatus for reducing electromagnetic interference and jamming in GPS equipment operating in rolling environments Mar. 1, 2005
6630905 System and method for redirecting a signal using phase conjugation Oct. 7, 2003
6181914 Active repeater for a transmission system Jan. 30, 2001
5400036 Energy transmission arrangement Mar. 21, 1995
5276449 Radar retroreflector with polarization control Jan. 4, 1994
5170167 Reflector for electromagnetic energy Dec. 8, 1992
5036333 Antenna-rotation compensation apparatus and method for phased array antennas Jul. 30, 1991
4985707 Retrodirective adaptive loop for meteor communications Jan. 15, 1991
4806938 Integrated self-adaptive array repeater and electronically steered directional transponder Feb. 21, 1989
4472719 ECM Multiple-target retrodirective antenna Sep. 18, 1984
4451699 Communications system and network May. 29, 1984
4337376 Communications system and network Jun. 29, 1982
4233606 Frequency translating phase conjugation circuit for active retrodirective antenna array Nov. 11, 1980
4225870 Null steering antenna Sep. 30, 1980
4213131 Scannable beam forming interferometer antenna array system Jul. 15, 1980
4163235 Satellite system Jul. 31, 1979
4161733 Null steering apparatus including weight oscillation eliminating means Jul. 17, 1979
4152702 Adaptive antenna lobing on spread spectrum signals at negative S/N May. 1, 1979
4148031 Phase conjugation method and apparatus for an active retrodirective antenna array Apr. 3, 1979
4146889 Method and apparatus for sidelobe reduction in radar Mar. 27, 1979
4121221 Radio frequency array antenna system Oct. 17, 1978
4005426 Signal processing method and apparatus Jan. 25, 1977
3958246 Circular retrodirective array May. 18, 1976











 
 
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