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. 26, 2005
Filed:
Feb. 23, 2001
Petteri Annamaa, Oulu, FI;
Jyrki Mikkola, Kempele, FI;
Petteri Annamaa, Oulu, FI;
Jyrki Mikkola, Kempele, FI;
Filtronic Lk Oy, Kempele, FI;
Abstract
The invention relates to planar antennas the structural components of which include a parasitic element. The antenna structure comprises a PIFA-type structure () to be placed inside the covers of a mobile station. The PIFA is fed parasitically e.g. through a conductive strip () placed on the same insulating board. The feed conductor () of the whole antenna structure is in galvanic contact with this feed element; a short-circuit point the feed element doesn't have. The feed element () also serves as an auxiliary radiator. The resonance frequencies of the antenna elements or their parts are arranged according to need so as to overlap, to be close to each other or to be relatively wide apart. The structure may also comprise a whip element in connection with the feed element. According to the invention, a relatively simple structure provides a reliable dual resonance and, hence, a relatively wideband antenna when the resonances are close to each other. Moreover, no polarization rotation takes place in the antenna radiation inside the frequency band realized through the dual resonance.