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:
Jul. 06, 2004
Filed:
Nov. 08, 2002
Court Rossman, Scotts Valley, CA (US);
Abstract
An efficient antenna exhibiting primarily circular polarization is described. Electrical performance is similar to that of a patch antenna having the same volume; however, greater bandwidth is achieved. The antenna consists of four radiating elements arranged in a semi-spiral configuration on a dielectric material, with a shunt feed system. The novel feed system incorporates a phase delay line, with two adjacent elements fed. The other two elements are parasitically coupled to the first two, with a 180 degree phase difference, resulting in a progressive phase shift of 90 degrees between the four elements. Circular polarization is a product of the symmetric geometry, as opposed to a circularly polarized patch antenna, which utilizes an offset feed. The antenna may be placed directly on a printed wiring board having a ground plane. The antenna is well suited for GPS applications and has a smaller major surface area than a patch antenna with comparable performance.