Patents
Patents for H01Q 25 - Aerials or aerial systems providing at least two radiating patterns (4,128)
11/1988
11/23/1988EP0291920A1 Airborne radar antenna
11/22/1988US4786910 Single reflector multibeam antenna arrangement with a wide field of view
11/17/1988WO1988009066A1 Microwave lens and array antenna
11/17/1988EP0291233A2 Multimode omni antenna with flush mount
11/17/1988EP0290508A1 Orthogonal mode electromagnetic wave launcher.
11/15/1988US4785310 Frequency selective screen having sharp transition
11/15/1988US4785307 Crossed log-periodic dipole antenna and method of making same
11/09/1988EP0289553A1 Monopulse antenna with improved sidelobe suppression.
11/03/1988WO1988008624A1 Technique for roll stabilization and partitioning of phased array antenna receiving apertures
11/03/1988WO1988008623A1 Multifunction active array
10/1988
10/25/1988US4780723 Microstrip antenna compressed feed
10/25/1988CA1243773A1 Dichroic antenna structure
10/11/1988US4777491 Angular-diversity radiating system for tropospheric-scatter radio links
10/06/1988WO1988007770A1 Plural level beam-forming network
09/1988
09/22/1988WO1988006808A3 Three dimensional feed through lens with hemispherical coverage
09/20/1988US4772893 Switched steerable multiple beam antenna system
09/07/1988WO1988006808A2 Three dimensional feed through lens with hemispherical coverage
09/06/1988US4769646 Antenna system and dual-fed lenses producing characteristically different beams
08/1988
08/24/1988EP0278982A1 Filter interconnection matrix.
08/23/1988US4766438 Three dimensional feed through lens with hemispherical coverage
08/23/1988US4766437 Antenna apparatus having means for changing the antenna radiation pattern
08/16/1988US4764775 Multi-mode feed horn
08/16/1988US4764771 Antenna feed network employing over-coupled branch line couplers
08/16/1988CA1240773A1 Wide angle multi-mode antenna
08/10/1988EP0277206A1 Antenna system for hybrid communications satellite.
08/10/1988EP0277189A1 Frequency selective screen having sharp transition.
08/10/1988EP0277173A1 Satellite communications system having frequency addressable high gain downlink beams.
08/09/1988CA1240389A1 Adaptive antenna for reducing multipath fades
08/03/1988EP0276817A2 Conformal array antenna
08/02/1988US4761827 Polarity switch for satellite television receiver
08/02/1988US4761653 Microstrip antenna
08/02/1988CA1240037A1 Microstrip space duplexed antenna
07/1988
07/28/1988WO1988005609A1 Slot antenna in circular waveguide
07/26/1988US4760399 Method for generating antenna follow-up signals
07/20/1988EP0275062A2 Multibeam antenna
07/19/1988US4758843 Printed, low sidelobe, monopulse array antenna
07/12/1988US4757323 Crossed polarization same-zone two-frequency antenna for telecommunications satellites
07/12/1988CA1239222A1 Grooved horn radiator with mode coupler
06/1988
06/30/1988WO1988004837A1 Steerable beam antenna system using butler matrix
06/28/1988US4754286 Line-fed phase controlled antenna
06/22/1988EP0271517A1 Array antenna.
06/16/1988WO1988004480A1 Composite antenna reflector with polarized subreflector
06/07/1988US4750000 Ultra-broadband impedance matched electrically small self-complementary signal radiating structures with impedance-inverting feed for complementary pairs using thin wire elements
06/07/1988CA1237809A1 Interleaved microstrip planar array
06/02/1988WO1988004109A1 Monopulse antenna with improved sidelobe suppression
06/01/1988DE3640782A1 Microwave antenna having a switchable aperture angle
05/1988
05/24/1988US4746923 For achieving frequency/temperature compensation
05/11/1988CN87105620A Satellite communication system of using frequency-division multiplex
05/11/1988CN87105576A Satellite communication system with integrated transmitter of transmitting down-multibeam
05/11/1988CN87105574A Interconnect matrix of filter
05/11/1988CN87105572A Satellite communication system with high-gain down-beam of frequency addressing
05/04/1988CN87105569A Selective screen with the characteristics of quick change and transition
05/03/1988CA1236178A1 Power amplifying apparatus
04/1988
04/27/1988CN87105577A Wave-packet shaping network
04/26/1988CA1235781A1 Doppler radar velocity measurement apparatus
04/21/1988WO1988002933A1 Orthogonal mode electromagnetic wave launcher
04/20/1988EP0264056A2 Vehicle antenna with shiftable gain patterns
04/19/1988US4739336 Log - periodic HF antenna system
04/12/1988US4737741 Orthogonal mode electromagnetic wave launcher
04/07/1988WO1988001455A3 Filter interconnection matrix
03/1988
03/30/1988EP0261983A2 Reconfigurable beam-forming network that provides in-phase power to each region
03/30/1988EP0261699A2 Angular-diversity radiosystem for tropospheric-scatter radio links
03/29/1988US4734700 Group antenna with electronically phase-controlled beam
03/29/1988CA1234621A1 Crossover traveling wave feed
03/16/1988CN87105573A Antenna system for hybrid-type communication satallite
03/08/1988US4730193 Microstrip antenna bulk load
03/02/1988EP0257544A2 Receiving device for microwave signals
03/01/1988US4728960 Multifunctional microstrip antennas
03/01/1988US4728956 Receivers and transmitters
02/1988
02/25/1988WO1988001457A1 Satellite communications system having frequency addressable high gain downlink beams
02/25/1988WO1988001456A1 Satellite communications system employing frequency reuse
02/25/1988WO1988001455A2 Filter interconnection matrix
02/25/1988WO1988001454A1 Satellite communications system having multiple downlink beams powered by pooled transmitters
02/25/1988WO1988001445A1 Antenna system for hybrid communications satellite
02/25/1988WO1988001442A1 Frequency selective screen having sharp transition
02/25/1988WO1988001441A1 Beam-forming network
02/04/1988DE3625113A1 Aerial element which is provided for a phased-array antenna
01/1988
01/28/1988DE3624176A1 Transmitting device for at least two radio-frequency transmitters radiating at different transmitter frequencies and with different radiation patterns
01/26/1988US4721960 Beam forming antenna system
01/20/1988EP0253465A1 Beam forming antenna system
01/20/1988EP0253425A2 Angular-diversity radiating system for tropospheric-scatter radio links
12/1987
12/29/1987US4716415 Dual polarization flat plate antenna
12/17/1987WO1987007772A1 Array antenna
12/08/1987US4712111 Antenna system
12/08/1987US4712110 Five-port monopulse antenna feed structure with one dedicated transmit port
12/01/1987US4710776 Power divider for multibeam antennas with shared feed elements
11/1987
11/17/1987CA1229388A1 Radio frequency power divider/combiner networks
11/03/1987US4704611 Electronic tracking system for microwave antennas
10/1987
10/20/1987US4701765 Structure for a dichroic antenna
10/14/1987EP0108094B1 Radiogoniometric device
10/13/1987US4700196 Highly decoupled cosited antennas
10/13/1987US4700193 Cross-polarized antenna
10/06/1987US4698639 Circularly polarized leaky waveguide doppler antenna
10/06/1987US4698638 Dual mode target seeking system
09/1987
09/29/1987US4697188 Interference canceler with difference beam
09/22/1987US4695844 Device for receiving dual polarized microwave signals
09/17/1987DE3608413A1 Directional antenna arrangement
09/17/1987DE3607846A1 Exciter system (energising system) for a receiving antenna
09/16/1987EP0237110A1 Direction-finding antenna system
09/15/1987CA1226934A1 Reconfigurable beam-forming network that provides in- phase power to each region
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