The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1999
Filed:
Jun. 13, 1997
Chun-Hong Harry Chen, Torrance, CA (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
A digital audio radio service (DARS) antenna system is provided. The DARS antenna system includes a broadcast antenna mounted on a spacecraft. The broadcast antenna includes a slotted waveguide direct radiating array (SWDRA). The DARS antenna system also includes a mobile user receive antenna having a quadrifilar helix antenna (QHA). The DARS antenna system further includes a parallel plate polarizer arranged on the broadcast antenna for generating circular polarization. In an embodiment, the polarizer has a plurality of thin plates arranged perpendicular to the SWDRA surface. Broadcast antenna is optimized for overall system performance and is capable of high RF power and beam shaping. The DARS antenna system is also highly reliable and easily deployed from a spacecraft. An embodiment of the DARS antenna system of the present invention further includes 'universal' model and 'regional' model mobile antennas to easily accommodate personal travel and commuter needs.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile