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:
Oct. 09, 2001
Filed:
Aug. 12, 1999
Oliver Paul Leisten, Northampton, GB;
Mark Roy Dowsett, Coventry, GB;
Sarantel Limited, Wellingborough, GB;
Abstract
A dielectrically-loaded antenna for operation at frequencies in excess of 200 MHz includes an antenna element structure disposed on a high dielectric constant core, which element structure comprises a pair of laterally opposed groups, of helical antenna elements. Each group comprises first and second mutually adjacent elements, of different thicknesses providing looped conductive paths on the antenna, formed by the first elements of each group and the second elements of each group respectively, which resonate at differing respective resonant frequencies to yield a relatively wide operating bandwidth. The helical elements of each group define, between them, part of an elongate channel which has an overall electrical length in the region of n&lgr;/2 within the operating frequency band to provide isolation between the looped conductive paths. The major part of each such channel is located between the elements so as to minimise intrusion with other parts of the antenna.