Patent ID: 6958730
Filing Date: 2005-10-25
Classification: H01Q

Abstract:
1. An antenna device comprising: a substrate made of one of a dielectric material and a magnetic material; a feed element disposed on the substrate and including a feeding terminal and a feed radiation electrode electrically coupled to the feeding terminal, the feed radiation electrode including a plurality of branched radiation electrodes, each of the plurality of branched radiation electrodes having one common end and extended ends defining open ends; and a plurality of non-feed elements disposed on the substrate, each of the plurality of non-feed elements including a ground terminal and a non-feed radiation electrode electrically coupled to the ground terminal, the non-feed radiation electrode extending from the ground terminal and including an extended end defining an open end; wherein each of the plurality of non-feed radiation electrodes is disposed along and in the vicinity of a respective one of the plurality of branched radiation electrodes of the feed radiation electrode; each of the non-feed radiation electrodes is disposed along an outer edge of the respective one of the plurality of branched radiation electrodes of the feed radiation electrode; a space between adjacent ones of the plurality of branched radiation electrodes gradually increases from the common end to the open ends; each of the plurality of branched radiation electrodes has a resonant frequency in a different frequency band from the remaining one of the plurality of branched radiation electrodes, and each of the plurality of non-feed radiation electrodes has a resonant frequency in a different frequency band from that of the remaining one of the plurality of non-feed radiation electrodes, such that each of the plurality of non-feed radiation electrodes disposed along and in the vicinity of a respective one of the plurality of branched radiation electrodes defines a double-resonance pair, and each of the double-resonance pairs double-resonate at a frequency band that is different from the remaining double-resonance pairs.