| Patents for H01Q 25 - Aerials or aerial systems providing at least two radiating patterns (4,128) |
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| 10/22/1991 | CA1291257C Antenna system for hybrid communications satellite |
| 10/15/1991 | CA1290847C Vehicle antenna with shiftable gain patterns |
| 10/08/1991 | CA1290430C Technique for roll stabilization and partitioning of phased array antenna receiving apertures |
| 10/01/1991 | US5053781 High resolution passive microwave sensors for earth remote sensing |
| 09/26/1991 | DE4009322A1 Supply system for angle diversity operation of dish reflector antenna - has pair of horns between dish and sub-reflector defining angle between them |
| 09/25/1991 | CN1054853A Quincuncial omnidirectional receiving antenna for tv |
| 09/24/1991 | US5051753 Array antenna system with direction finding capability |
| 09/24/1991 | CA1289660C Orthogonal mode electromagnetic wave launcher |
| 09/18/1991 | EP0446610A1 Magnified phased array with a digital beamforming network |
| 09/03/1991 | US5045862 Dual polarization microstrip array antenna |
| 09/03/1991 | CA1288480C Satellite communications system employing frequency reuse |
| 08/29/1991 | DE4004611A1 Angle discriminator locating direction of HF EM waves - uses superheterodyne system with sum and difference components |
| 08/28/1991 | EP0443786A2 Multiple-beam energy transmission system |
| 08/28/1991 | EP0443526A1 A microwave coupling arrangement |
| 08/21/1991 | EP0277189B1 Frequency selective screen having sharp transition |
| 08/14/1991 | EP0441180A1 Integrated circuits containing microwave circuits |
| 08/13/1991 | US5039993 Periodic array with a nearly ideal element pattern |
| 08/07/1991 | EP0440200A2 Method of managing beams formed by phased array antennas and apparatus therefor |
| 08/06/1991 | US5038150 Feed network for a dual circular and dual linear polarization antenna |
| 08/01/1991 | DE4002522A1 Sum and difference unit for radar group antenna - has single structure with eight sections arranged in quadrants |
| 07/30/1991 | US5036336 System for the integration of I.F.F. sum and difference channels in a radar surveillance antenna |
| 07/30/1991 | US5036332 Multi-mode feed system for a monopulse antenna |
| 07/24/1991 | EP0271517B1 Array antenna |
| 07/23/1991 | US5034752 Multiple-beam antenna system with active modules and digital beam-forming |
| 07/09/1991 | US5030960 Monopulse antenna with improved sidelobe suppression |
| 07/03/1991 | EP0434866A1 Dual mode log periodic dipole antenna |
| 06/26/1991 | EP0434374A2 Low noise dual polarization electro-magnetic power reception and conversion system |
| 06/26/1991 | EP0434282A2 Dual mode antenna apparatus having slotted waveguide and broadband arrays |
| 06/19/1991 | EP0433255A2 Orthogonally polarized dual-band printed circuit antenna employing radiating elements capacitively coupled to feedlines |
| 06/18/1991 | US5025493 Multi-element antenna system and array signal processing method |
| 06/11/1991 | US5023634 Antenna system |
| 06/11/1991 | US5023623 Dual mode antenna apparatus having slotted waveguide and broadband arrays |
| 06/11/1991 | US5023619 Satellite communications system |
| 06/05/1991 | EP0430516A2 A periodic array with a nearly ideal element pattern |
| 06/04/1991 | US5021796 Broad band, polarization diversity monopulse antenna |
| 05/24/1991 | CA2004095A1 Pattern diversity in a microwave digital radio system utilizing a single horn reflector antenna |
| 05/21/1991 | US5018065 Processor for constrained least squares computations |
| 05/21/1991 | US5017927 Monopulse phased array antenna with plural transmit-receive module phase shifters |
| 05/21/1991 | US5017925 Multiple beam deployable space antenna system |
| 05/16/1991 | WO1991001620A3 Multi-element antenna system and array signal processing method |
| 05/15/1991 | EP0427470A2 Constant beamwidth scanning array |
| 05/15/1991 | EP0427201A2 Satellite beam-forming network system having improved beam shaping |
| 05/14/1991 | US5016018 Aperture synthesized radiometer using digital beamforming techniques |
| 05/08/1991 | EP0426566A1 Multifocal receiving antenna with one single pointing direction for reception from several satellites |
| 05/01/1991 | WO1991006988A1 Multifocal receiving antenna with a single plotting direction for several satellites |
| 05/01/1991 | CA2044586A1 Antenne de reception multifocale a direction de pointage unique pour plusieurs satellites |
| 04/30/1991 | US5012256 Array antenna |
| 04/30/1991 | US5012254 Plural level beam-forming netowrk |
| 04/24/1991 | EP0423552A2 Digital beamforming for multiple independent transmit beams |
| 04/17/1991 | EP0422551A1 Electronically scanned transmitting antenna |
| 04/17/1991 | EP0422431A2 Angular-diversity device |
| 04/16/1991 | US5008678 Electronically scanning vehicle radar sensor |
| 04/10/1991 | EP0421722A2 Multiple beam deployable space antenna system |
| 04/09/1991 | CA1282880C Filter interconnection matrix |
| 04/09/1991 | CA1282879C Beam-forming network |
| 04/09/1991 | CA1282878C Satellite communications system having multiple downlink beams powered by pooled transmitters |
| 04/03/1991 | EP0420739A1 Feeding device for a multiple beam antenna |
| 03/20/1991 | EP0417679A1 Multiple beam antenna, steerable by low switching rate |
| 03/19/1991 | US5001444 Two-frequency radiating device |
| 03/14/1991 | CA2025154A1 Multibeam antenna steerable by means of a low level switching |
| 03/13/1991 | EP0416300A2 Dual polarized spiral antenna |
| 02/21/1991 | WO1991001620A2 Multi-element antenna system and array signal processing method |
| 02/19/1991 | US4994819 Pattern diversity in a microwave digital radio system utilizing a single horn reflector antenna |
| 01/29/1991 | US4989011 Dual mode phased array antenna system |
| 01/24/1991 | DE4021167A1 Doppler microwave device for speed-distance measurement - has interdigitated counter-terminating dual antenna to save space |
| 01/23/1991 | CN2070040U Multi-beam aerial capable of receiving tv programmes simultaneously from two or three satellites |
| 01/16/1991 | EP0408193A1 Aircraft landing system having simplified out-of-coverage indication (OCI) |
| 01/10/1991 | CA2019677A1 Aircraft landing system having simplified out-of coverage indication (oci) |
| 01/09/1991 | EP0407243A1 Multiple beam antenna system with active modules and with formation of beams by numerical calculation |
| 01/09/1991 | CN1011179B Interconnect matrix of filter |
| 01/02/1991 | EP0405372A1 Multiple-beam array antenna |
| 01/02/1991 | CN1048285A Multi-element antenna system and array signal processing method |
| 01/01/1991 | US4982197 Dual mode log periodic dipole antenna |
| 12/18/1990 | CA1278114C Satellite communications system employing frequency reuse |
| 12/18/1990 | CA1278076C Method for generating antenna follow-up signals |
| 12/02/1990 | CA2017463A1 Multi-element antenna system and array signal processing method |
| 11/22/1990 | EP0398555A2 Lightweight, low profile phased array antenna with electromagnetically coupled integrated subarrays |
| 11/20/1990 | US4972199 Low cross-polarization radiator of circularly polarized radiation |
| 11/16/1990 | CA2014665A1 Lightweight, low profile phased array antenna with electromagnetically coupled integrated subarrays |
| 11/14/1990 | EP0396668A1 Radar system for determining angular position utilizing a linear phased array antenna |
| 11/13/1990 | CA1276289C Log - periodic hf antenna system |
| 11/07/1990 | EP0395863A2 Aperture synthesized radiometer using digital beamforming techniques |
| 11/06/1990 | US4968982 Aircraft landing system having simplified out-of-coverage indication (OCI) |
| 10/23/1990 | US4965605 Lightweight, low profile phased array antenna with electromagnetically coupled integrated subarrays |
| 10/23/1990 | US4965602 Digital beamforming for multiple independent transmit beams |
| 10/23/1990 | US4965588 Electronically scanned antenna |
| 10/23/1990 | US4965587 Antenna which is electronically reconfigurable in transmission |
| 10/09/1990 | US4962383 Low profile array antenna system with independent multibeam control |
| 10/03/1990 | EP0390350A2 Low cross-polarization radiator of circularly polarized radiation |
| 09/18/1990 | US4958167 Ultra-broadband impedance matched electrically small complementary signal radiating structures using thin wire elements and an impedance optimizing feed circuit |
| 09/18/1990 | US4958166 Amplitude monopulse slotted array |
| 08/21/1990 | CA1273071A1 Frequency selective screen having sharp transition |
| 08/09/1990 | DE3902739A1 Radar antenna array |
| 08/08/1990 | EP0380914A2 Antenna system |
| 08/07/1990 | US4947176 Multiple-beam antenna system |
| 08/04/1990 | WO1990009042A1 Antenna arrays |
| 07/24/1990 | US4943811 Dual polarization electromagnetic power reception and conversion system |
| 07/11/1990 | EP0377155A1 Dual frequency radiating device |
| 07/04/1990 | EP0376074A2 Dual polarization microstrip array antenna |
| 07/04/1990 | CN1008678B Satellite communication system |