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Class Information
Number: 342/447
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Beacon or receiver > Direction-finding receiver only > Having a spiral antennas
Description: Subject matter wherein the direction finding receiver is coupled to an antenna which has the form of a helix.

Patents under this class:

Patent Number Title Of Patent Date Issued
8305265 Radio-based direction-finding navigation system using small antenna Nov. 6, 2012
8185162 Electrically tilted antenna system with polarisation diversity May. 22, 2012
7898477 Volumetric direction-finding using a Maxwell Fish-Eye lens Mar. 1, 2011
7688263 Volumetric direction-finding system using a Luneberg Lens Mar. 30, 2010
7613482 Method and system for steering antenna beam Nov. 3, 2009
4591862 Monopulse receiver for a four arm log spiral antenna May. 27, 1986
4366483 Receiver and method for use with a four-arm spiral antenna Dec. 28, 1982
4309706 Wideband direction-finding system Jan. 5, 1982
3949407 Direct fed spiral antenna Apr. 6, 1976

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