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:
Nov. 24, 1998
Filed:
Oct. 11, 1996
Thomas J Birnbaum, Scotts Valley, CA (US);
ACS Wireless, Inc., Scotts Valley, CA (US);
Abstract
An antenna includes a conductive coil electrically coupled to a wave launching structure and configured such that a plurality of capacitances act electrically in parallel with a plurality of distinct portions of the conductive coil. The capacitances configure what would otherwise be a conventional normal-mode helical antenna for operation at multiple, closely spaced resonance frequencies. The antenna operates at the multiple resonance frequencies with only a small loss of efficiency relative to the maximum response of a conventional normal-mode helical antenna that has a single resonance frequency. Also, the antenna in accordance with the invention is self-duplexing, eliminating the need for complex and expensive duplexing circuitry.