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