Patents
Patents for H01Q 21 - Aerial arrays or systems (25,127)
09/1990
09/13/1990DE3907606A1 Microwave antenna
09/12/1990EP0385978A1 Method and apparatus for hyperthermia treatment
09/11/1990CA1274015A1 Cylindrical omnidirectional antenna
09/05/1990CN2061737U Rotary controllable broad-band combination tv antenna
08/1990
08/29/1990EP0384780A2 Planar microwave antenna
08/29/1990EP0384777A2 Antenna element
08/29/1990CN2061335U Omnidirectional full frequency channel television receiving antenna
08/29/1990CN2061334U 混合放大远程电视接收天线 Hybrid amplification remote TV antenna
08/28/1990US4952894 Waveguide feed network for antenna array
08/22/1990EP0383597A2 Planar antenna
08/21/1990US4951060 Dual frequency transmit-receive module for an active aperture radar system
08/16/1990EP0382130A2 Small radio-controlled clock with an antenna coil
08/15/1990CN2060600U Vertical narrow beam antenna for the use of scatter propagation
08/14/1990US4949092 Modularized contoured beam direct radiating antenna
08/14/1990US4949090 Transmit/receive module test system
08/09/1990DE3902739A1 Radar antenna array
08/08/1990EP0380914A2 Antenna system
08/07/1990US4947182 Method of feeding electromagnetic power from an antenna element
08/07/1990US4947176 Multiple-beam antenna system
08/04/1990WO1990009042A1 Antenna arrays
08/02/1990DE4002678A1 Kreisschlitz-arrayantenne mit abgleichteil Circular slot-array antenna with matching part
08/02/1990DE4002176A1 GPS navigation arrangement for vehicle
07/1990
07/31/1990US4944087 Method of making a curved plastic body with circuit pattern
07/25/1990EP0379434A1 Ultra-high frequency and high-temperature antenna, especially for a spacecraft
07/25/1990EP0378905A1 Slot-coupled patch antenna and phased-array antenna arrangement incorporating such an antenna
07/25/1990CN2059769U Amplification antenna used in both in- or out-door
07/24/1990US4943811 Dual polarization electromagnetic power reception and conversion system
07/24/1990US4943809 Electromagnetically coupled microstrip antennas having feeding patches capacitively coupled to feedlines
07/19/1990DE3927141A1 Kreispolarisations-antennensystem Circular polarization antenna system
07/18/1990EP0377999A1 Microstrip antenna-arrays
07/18/1990EP0377921A1 Antenna
07/18/1990EP0377858A1 Embedded surface wave antenna
07/12/1990WO1990007802A1 Self-adaptive directional filtering and polarisation device for radioelectric waves
07/11/1990EP0377155A1 Dual frequency radiating device
07/04/1990EP0376074A2 Dual polarization microstrip array antenna
07/03/1990US4939527 Distribution network for phased array antennas
07/03/1990US4939523 Aircraft radar antenna
06/1990
06/30/1990CA2006494A1 Auto-adaptive direction and polarization filtering device for radio waves received by an antenna array coupled to a receiver
06/28/1990WO1990007201A1 Improved feed waveguide for an array antenna
06/28/1990WO1990007200A1 Ultralight microwave antenna and method of fabrication
06/27/1990EP0375415A2 Plane slot antennas and their use in motor vehicles
06/26/1990US4937585 Microwave circuit module, such as an antenna, and method of making same
06/20/1990EP0374008A1 Over the whole spherical space electronically scanning antenna with random and reduced three-dimensional distribution of the antenna elements
06/19/1990CA2003468A1 Ultralight microwave antenna and method of fabrication
06/19/1990CA1270550A1 Wave guide element for an electrically controlled radar antenna
06/13/1990EP0372451A1 Multifrequency radiating device
06/12/1990US4933682 Point to point microwave communication service antenna pattern with anull in an interering direction
06/12/1990US4933680 Microstrip antenna system with multiple frequency elements
06/12/1990US4933679 Antenna
06/05/1990US4931808 Embedded surface wave antenna
06/05/1990US4931799 Short-range radar transceiver employing a FET oscillator
05/1990
05/31/1990DE3839945A1 Phased antenna array
05/29/1990US4929959 Dual-polarized printed circuit antenna having its elements capacitively coupled to feedlines
05/22/1990US4926868 Method and apparatus for cardiac hemodynamic monitor
05/17/1990WO1990005390A1 Improved extendable antenna for portable cellular telephones
05/16/1990EP0368121A1 Electronically scanned antenna
05/15/1990US4926189 High-gain single- and dual-polarized antennas employing gridded printed-circuit elements
05/09/1990EP0367609A2 Improved extendable antenna for portable cellular telephones
05/08/1990US4924234 Plural level beam-forming network
05/03/1990WO1990004862A1 Array antenna and a feeder device therefor
05/03/1990DE3837148A1 Omnidirectional antenna arrangement for time signal receivers
05/01/1990US4922263 Plate antenna with double crossed polarizations
05/01/1990US4922261 Aerial systems
05/01/1990US4922259 Microstrip patch antenna with omni-directional radiation pattern
04/1990
04/24/1990US4920450 Temperature dependent capacitor
04/19/1990WO1990004319A1 Curved plastic body with circuit pattern and method of making
04/18/1990EP0363841A2 Plural layer coupling system
04/17/1990US4918458 Secondary radar transponder
04/17/1990US4918457 Antenna formed of strip transmission lines with non-conductive coupling
04/12/1990DE3926187A1 Schlitzstrahler Slot radiator
04/11/1990CN2055991U Balcong high gain direction-changeable antenna
04/11/1990CN2055990U Three band input mixing type tv receiving antenna
04/11/1990CN2055989U U/v all channel indoor tv receiving antenna
04/10/1990US4916458 Slotted waveguide antenna
04/10/1990US4916457 Printed-circuit crossed-slot antenna
04/05/1990WO1990003667A1 Automatic polarization control system for tvro receivers
04/04/1990EP0362165A1 Method of feeding electromagnetic power from an antenna element
04/04/1990EP0361417A2 Microstrip antenna system with multiple frequency elements
04/04/1990EP0360861A1 Circularly polarized microstrip antenna array.
04/03/1990US4914449 Microwave antenna structure with intergral radome and rear cover
04/03/1990US4914445 Microstrip antennas and multiple radiator array antennas
03/1990
03/28/1990EP0360692A1 Composite duplex antenna with circular polarisation
03/28/1990CN1040890A Slot array antenna
03/27/1990US4912482 Antenna
03/27/1990US4912481 Compact multi-frequency antenna array
03/27/1990US4912480 Offset phase-center antenna for aircraft landing system
03/21/1990EP0359238A2 Array antenna device having IC units with IF conversion circuits for coupling antenna elements and signal combiner
03/14/1990EP0358342A1 A microwave radiometer
03/07/1990EP0357233A2 Waveguide apparatus
03/07/1990CN1040288A Slot array antenna
03/06/1990US4907012 Antenna
03/06/1990US4907008 Antenna for transmitting circularly polarized television signals
02/1990
02/28/1990EP0355898A1 A planar array antenna, comprising coplanar waveguide printed feed lines cooperating with apertures in a ground plane
02/27/1990US4905011 Concentric ring antenna
02/27/1990US4904831 Mitered mechanical switches
02/27/1990CA1266325A1 Microwave antenna
02/15/1990DE3926188A1 Schlitzstrahler Slot radiator
02/08/1990DE3826777A1 Axial two-band antenna
02/07/1990EP0354076A1 Antenna with microwave energy distribution across triplate lines
02/06/1990US4899166 Self protected and transportable flat lattice antenna