Patents
Patents for H01Q 25 - Aerials or aerial systems providing at least two radiating patterns (4,128)
10/1991
10/22/1991CA1291257C Antenna system for hybrid communications satellite
10/15/1991CA1290847C Vehicle antenna with shiftable gain patterns
10/08/1991CA1290430C Technique for roll stabilization and partitioning of phased array antenna receiving apertures
10/01/1991US5053781 High resolution passive microwave sensors for earth remote sensing
09/1991
09/26/1991DE4009322A1 Supply system for angle diversity operation of dish reflector antenna - has pair of horns between dish and sub-reflector defining angle between them
09/25/1991CN1054853A Quincuncial omnidirectional receiving antenna for tv
09/24/1991US5051753 Array antenna system with direction finding capability
09/24/1991CA1289660C Orthogonal mode electromagnetic wave launcher
09/18/1991EP0446610A1 Magnified phased array with a digital beamforming network
09/03/1991US5045862 Dual polarization microstrip array antenna
09/03/1991CA1288480C Satellite communications system employing frequency reuse
08/1991
08/29/1991DE4004611A1 Angle discriminator locating direction of HF EM waves - uses superheterodyne system with sum and difference components
08/28/1991EP0443786A2 Multiple-beam energy transmission system
08/28/1991EP0443526A1 A microwave coupling arrangement
08/21/1991EP0277189B1 Frequency selective screen having sharp transition
08/14/1991EP0441180A1 Integrated circuits containing microwave circuits
08/13/1991US5039993 Periodic array with a nearly ideal element pattern
08/07/1991EP0440200A2 Method of managing beams formed by phased array antennas and apparatus therefor
08/06/1991US5038150 Feed network for a dual circular and dual linear polarization antenna
08/01/1991DE4002522A1 Sum and difference unit for radar group antenna - has single structure with eight sections arranged in quadrants
07/1991
07/30/1991US5036336 System for the integration of I.F.F. sum and difference channels in a radar surveillance antenna
07/30/1991US5036332 Multi-mode feed system for a monopulse antenna
07/24/1991EP0271517B1 Array antenna
07/23/1991US5034752 Multiple-beam antenna system with active modules and digital beam-forming
07/09/1991US5030960 Monopulse antenna with improved sidelobe suppression
07/03/1991EP0434866A1 Dual mode log periodic dipole antenna
06/1991
06/26/1991EP0434374A2 Low noise dual polarization electro-magnetic power reception and conversion system
06/26/1991EP0434282A2 Dual mode antenna apparatus having slotted waveguide and broadband arrays
06/19/1991EP0433255A2 Orthogonally polarized dual-band printed circuit antenna employing radiating elements capacitively coupled to feedlines
06/18/1991US5025493 Multi-element antenna system and array signal processing method
06/11/1991US5023634 Antenna system
06/11/1991US5023623 Dual mode antenna apparatus having slotted waveguide and broadband arrays
06/11/1991US5023619 Satellite communications system
06/05/1991EP0430516A2 A periodic array with a nearly ideal element pattern
06/04/1991US5021796 Broad band, polarization diversity monopulse antenna
05/1991
05/24/1991CA2004095A1 Pattern diversity in a microwave digital radio system utilizing a single horn reflector antenna
05/21/1991US5018065 Processor for constrained least squares computations
05/21/1991US5017927 Monopulse phased array antenna with plural transmit-receive module phase shifters
05/21/1991US5017925 Multiple beam deployable space antenna system
05/16/1991WO1991001620A3 Multi-element antenna system and array signal processing method
05/15/1991EP0427470A2 Constant beamwidth scanning array
05/15/1991EP0427201A2 Satellite beam-forming network system having improved beam shaping
05/14/1991US5016018 Aperture synthesized radiometer using digital beamforming techniques
05/08/1991EP0426566A1 Multifocal receiving antenna with one single pointing direction for reception from several satellites
05/01/1991WO1991006988A1 Multifocal receiving antenna with a single plotting direction for several satellites
05/01/1991CA2044586A1 Antenne de reception multifocale a direction de pointage unique pour plusieurs satellites
04/1991
04/30/1991US5012256 Array antenna
04/30/1991US5012254 Plural level beam-forming netowrk
04/24/1991EP0423552A2 Digital beamforming for multiple independent transmit beams
04/17/1991EP0422551A1 Electronically scanned transmitting antenna
04/17/1991EP0422431A2 Angular-diversity device
04/16/1991US5008678 Electronically scanning vehicle radar sensor
04/10/1991EP0421722A2 Multiple beam deployable space antenna system
04/09/1991CA1282880C Filter interconnection matrix
04/09/1991CA1282879C Beam-forming network
04/09/1991CA1282878C Satellite communications system having multiple downlink beams powered by pooled transmitters
04/03/1991EP0420739A1 Feeding device for a multiple beam antenna
03/1991
03/20/1991EP0417679A1 Multiple beam antenna, steerable by low switching rate
03/19/1991US5001444 Two-frequency radiating device
03/14/1991CA2025154A1 Multibeam antenna steerable by means of a low level switching
03/13/1991EP0416300A2 Dual polarized spiral antenna
02/1991
02/21/1991WO1991001620A2 Multi-element antenna system and array signal processing method
02/19/1991US4994819 Pattern diversity in a microwave digital radio system utilizing a single horn reflector antenna
01/1991
01/29/1991US4989011 Dual mode phased array antenna system
01/24/1991DE4021167A1 Doppler microwave device for speed-distance measurement - has interdigitated counter-terminating dual antenna to save space
01/23/1991CN2070040U Multi-beam aerial capable of receiving tv programmes simultaneously from two or three satellites
01/16/1991EP0408193A1 Aircraft landing system having simplified out-of-coverage indication (OCI)
01/10/1991CA2019677A1 Aircraft landing system having simplified out-of coverage indication (oci)
01/09/1991EP0407243A1 Multiple beam antenna system with active modules and with formation of beams by numerical calculation
01/09/1991CN1011179B Interconnect matrix of filter
01/02/1991EP0405372A1 Multiple-beam array antenna
01/02/1991CN1048285A Multi-element antenna system and array signal processing method
01/01/1991US4982197 Dual mode log periodic dipole antenna
12/1990
12/18/1990CA1278114C Satellite communications system employing frequency reuse
12/18/1990CA1278076C Method for generating antenna follow-up signals
12/02/1990CA2017463A1 Multi-element antenna system and array signal processing method
11/1990
11/22/1990EP0398555A2 Lightweight, low profile phased array antenna with electromagnetically coupled integrated subarrays
11/20/1990US4972199 Low cross-polarization radiator of circularly polarized radiation
11/16/1990CA2014665A1 Lightweight, low profile phased array antenna with electromagnetically coupled integrated subarrays
11/14/1990EP0396668A1 Radar system for determining angular position utilizing a linear phased array antenna
11/13/1990CA1276289C Log - periodic hf antenna system
11/07/1990EP0395863A2 Aperture synthesized radiometer using digital beamforming techniques
11/06/1990US4968982 Aircraft landing system having simplified out-of-coverage indication (OCI)
10/1990
10/23/1990US4965605 Lightweight, low profile phased array antenna with electromagnetically coupled integrated subarrays
10/23/1990US4965602 Digital beamforming for multiple independent transmit beams
10/23/1990US4965588 Electronically scanned antenna
10/23/1990US4965587 Antenna which is electronically reconfigurable in transmission
10/09/1990US4962383 Low profile array antenna system with independent multibeam control
10/03/1990EP0390350A2 Low cross-polarization radiator of circularly polarized radiation
09/1990
09/18/1990US4958167 Ultra-broadband impedance matched electrically small complementary signal radiating structures using thin wire elements and an impedance optimizing feed circuit
09/18/1990US4958166 Amplitude monopulse slotted array
08/1990
08/21/1990CA1273071A1 Frequency selective screen having sharp transition
08/09/1990DE3902739A1 Radar antenna array
08/08/1990EP0380914A2 Antenna system
08/07/1990US4947176 Multiple-beam antenna system
08/04/1990WO1990009042A1 Antenna arrays
07/1990
07/24/1990US4943811 Dual polarization electromagnetic power reception and conversion system
07/11/1990EP0377155A1 Dual frequency radiating device
07/04/1990EP0376074A2 Dual polarization microstrip array antenna
07/04/1990CN1008678B Satellite communication system
1 ... 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42