| Patents for H01Q 19 - Combinations of primary active aerial elements and units with secondary devices, e.g. with quasi-optical devices, for giving the aerial a desired directional characteristic (10,176) |
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| 08/28/1991 | EP0442925A1 Microwave signal receiving apparatus |
| 08/28/1991 | CN2083789U Foldable satellite communication antenna |
| 08/27/1991 | CA2036779A1 In-furnace level meter and antenna therefor |
| 08/22/1991 | WO1991012637A1 Antenna |
| 08/21/1991 | EP0277189B1 Frequency selective screen having sharp transition |
| 08/20/1991 | US5041840 Multiple frequency antenna feed |
| 08/20/1991 | CA1287917C Three resonator parasitically coupled microstrip antenna array element |
| 08/08/1991 | DE4001952A1 Double exciter for reflector antenna - has dielectric region with low dielectric constant |
| 08/07/1991 | EP0439800A1 Dual-reflector antenna |
| 08/07/1991 | CN2082464U Multistars tv receiving antenna of great field of view type |
| 08/06/1991 | US5038152 Broad band omnidirectional monocone antenna |
| 08/06/1991 | US5038147 Electronically scanned antenna |
| 08/01/1991 | DE4002058A1 Conical microwave range antenna - has reflector directing emission through cylinder dome for circular polar diagram |
| 07/24/1991 | EP0271517B1 Array antenna |
| 07/23/1991 | US5034750 Pulse radar and components therefor |
| 07/18/1991 | DE4000763A1 Printed circuit group antenna - used circular symmetrical array on dielectric substrate to reduce cross polarisation economically |
| 07/04/1991 | DE4002233C1 Coupling unit for waveguide - releasable connects radio equipment to aerial by spring-mounted module axially slidable w.r.t. terminal end of waveguide |
| 05/29/1991 | DE3939318A1 Earth station aerial for satellite traffic - is fitted to rotary frame aligning to long aperture axis parallel to satellite path tangent |
| 05/28/1991 | US5019833 Portable antenna apparatus for satellite communication |
| 05/23/1991 | DE4037851A1 Coaxial wide band TV or radio aerial - has non-conductive horizontal plane and fed, elongate, conductive, grid-shaped radiator element with two mirror-shaped inner conductors |
| 05/23/1991 | DE3938443A1 Reflector antenna for two differing frequency ranges - achieves broadened characteristic in one range using horn radiator as exciter |
| 05/23/1991 | DE3938217A1 Reflector aerial for two different frequency ranges - has exciter with high secondary lobes and narrowing radiation diagram with increased frequency |
| 05/21/1991 | US5017937 Wideband horn antenna |
| 05/21/1991 | US5017936 Microwave antenna |
| 05/21/1991 | US5017925 Multiple beam deployable space antenna system |
| 05/15/1991 | EP0427201A2 Satellite beam-forming network system having improved beam shaping |
| 05/15/1991 | EP0427131A2 Directive radar antenna with electromagnetic energy compression, for telecommunications |
| 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 |
| 04/17/1991 | EP0422551A1 Electronically scanned transmitting antenna |
| 04/16/1991 | US5008681 Microstrip antenna with parasitic elements |
| 04/16/1991 | US5007721 Mechanically rotated Doppler frequency shifter |
| 04/10/1991 | EP0421722A2 Multiple beam deployable space antenna system |
| 04/10/1991 | CN2074940U Small satellite television square antenna |
| 04/09/1991 | CA1282879C Beam-forming network |
| 04/09/1991 | CA1282862C Modular antenna array |
| 04/04/1991 | DE3931879A1 Yagi antenna - has directors fixed to carrier tube by specified adhesive |
| 04/03/1991 | EP0420739A1 Feeding device for a multiple beam antenna |
| 04/03/1991 | CN1050470A Plate-type broad-band microwave antenna with reflecting surface |
| 04/02/1991 | US5005022 Microwave antenna |
| 03/21/1991 | DE4023750A1 Anti-stealth radar location - using plate lens of plastic or pigmented plastic spaced from antenna to give virtual gain |
| 03/20/1991 | EP0417679A1 Multiple beam antenna, steerable by low switching rate |
| 03/14/1991 | CA2025154A1 Multibeam antenna steerable by means of a low level switching |
| 03/13/1991 | EP0372023A4 Multimode dielectric-loaded multi-flare antenna |
| 03/07/1991 | DE4024629A1 Achieving passive gain for radar of similar - using plastics material or ceramics with or without pigments for antenna, waveguide or circuit |
| 02/21/1991 | WO1991002386A1 Transmitting and receiving arrangement for portable appliances |
| 01/29/1991 | US4989014 Reception antenna system |
| 01/22/1991 | US4987423 Wide band loop antenna with disymmetrical feeding, notably antenna for transmission, and array antenna formed by several such antennas |
| 01/16/1991 | CN2069543U Solar cooking stove used in buliding balcony and acted as multiple focusing antenna concurrently |
| 01/08/1991 | US4983988 Antenna with enhanced gain |
| 01/01/1991 | US4982198 High performance dipole feed for reflector antennas |
| 12/18/1990 | US4978967 Offset antenna |
| 12/18/1990 | CA1278114C Satellite communications system employing frequency reuse |
| 12/12/1990 | EP0401252A1 Microstrip antenna. |
| 12/12/1990 | CN1010805B Single antenna, multipolarization, frequency modulated continuous-wave radar |
| 12/11/1990 | US4977407 Optical collimator |
| 12/05/1990 | EP0400929A1 Waveguide antenna with increased gain |
| 12/04/1990 | US4975712 Two-dimensional scanning antenna |
| 12/01/1990 | WO1990015453A1 Waveguide antenna with increased gain |
| 12/01/1990 | CA2032164A1 Waveguide antenna with increased gain |
| 11/21/1990 | CN1047170A Multimode dielectric-loaded multi-flare antenna |
| 11/20/1990 | WO1990014696A1 Antenna apparatus with reflector or lens consisting of a frequency scanned grating |
| 11/20/1990 | US4972199 Low cross-polarization radiator of circularly polarized radiation |
| 11/20/1990 | CA2058304A1 Antenna apparatus with reflector or lens consisting of a frequency scanned grating |
| 11/15/1990 | WO1990013927A1 Antenna system |
| 11/14/1990 | EP0397070A2 Antenna with a parabolic reflector |
| 11/14/1990 | CN1046998A Flat slot array antenna for te mode wave |
| 11/13/1990 | US4970525 Waveguide antenna with increased gain |
| 11/01/1990 | WO1990013153A1 Reflector for converging reflected electromagnetic radiation in an aperture positioned at the rear of the reflector |
| 10/31/1990 | EP0394795A1 Antenna having a parabolic reflector |
| 10/31/1990 | DE4020390A1 Satellite reception aerial for both radio and TV programs - has ancillary reflectors which deflect focal points of main aerial dish to reception electronics common point |
| 10/31/1990 | DE4020389A1 Array structure for stationary satellite reception aerial - has several parabolic beam reflectors, one behind other, to impinge common point of reception electronics |
| 10/28/1990 | CA2015775A1 Te mode wave flat slot array antenna |
| 10/23/1990 | US4965869 Aperture antenna having nonuniform resistivity |
| 10/23/1990 | US4965588 Electronically scanned antenna |
| 10/23/1990 | US4965587 Antenna which is electronically reconfigurable in transmission |
| 10/23/1990 | CA1275494C Antenna apparatus for receiving radio waves |
| 10/16/1990 | US4963878 Reflector antenna with a self-supported feed |
| 10/10/1990 | EP0391634A1 Microstrip antenna with parasitic elements |
| 10/03/1990 | EP0390350A2 Low cross-polarization radiator of circularly polarized radiation |
| 09/25/1990 | US4959657 Omnidirectional antenna assembly |
| 09/20/1990 | WO1990010959A1 Combination dipole array and slot array antenna |
| 09/20/1990 | DE3908893A1 Ring radiating element using printed circuit technology |
| 09/18/1990 | CA1274327A1 Microwave transmitter/receiver apparatus |
| 09/13/1990 | DE4005982A1 Horizontal broad band antenna - has operation over 5 short wave bands with low noise |
| 09/13/1990 | DE3907203A1 Device for radar image scanning |
| 09/05/1990 | CN2061736U Ring focusing communication antenna |
| 08/29/1990 | EP0384021A1 Antenna system having azimuth rotating directive beam with selectable polarization |
| 08/22/1990 | EP0383657A1 Antenna system for the reception of direct broadcast satellite (DBS) emissions |
| 08/22/1990 | EP0187800B1 Cassegrain aerial system |
| 08/22/1990 | CN2060950U Shutter curtains device for aerial |
| 08/21/1990 | CA1273071A1 Frequency selective screen having sharp transition |
| 08/17/1990 | CA2010255A1 Antenna system for reception from direct broadcasting satellites |
| 08/14/1990 | US4949094 Nearfield/farfield antenna with parasitic array |
| 08/14/1990 | US4947848 Dielectric-constant change monitoring |
| 08/08/1990 | EP0381037A1 Antenna system |
| 07/18/1990 | EP0377858A1 Embedded surface wave antenna |
| 07/18/1990 | CN1008858B Portable antenna device for satellite communucation |