Patent ID: 7986273
Filing Date: 2011-07-26
Classification: H01Q

Abstract:
1. A multi-band monopole antenna comprising: a first metal radiator and a second metal radiator arranged in a pair and adapted to excite a high frequency band, said first metal radiator and said second metal radiator being kept apart at a distance and extending in one same direction, said first metal radiator comprising a feed end, said second metal radiator comprising a connection end, said feed end and said connection end being disposed at a same side relative to said first metal radiator and said second metal radiator; and a detoured wire pattern disposed at one side relative to said first metal radiator and said second metal radiator and adapted to excite a low frequency band, said detoured wire pattern comprising a first end connected with said feed end of said first metal radiator and a second end connected with said connection end of said second metal radiator; wherein said detoured wire pattern has a circuit path length longer than one half of said high frequency band λ/2 so that the phase difference on current between the feed end of said first metal radiator and the connection end of said second metal radiator is about π; when the reversed phases of electromagnetic waves excited by said first metal radiator and said second metal radiator reach the HAC test surface, they cause a destructive interference, thereby improving hearing aid compatibility performance of the multi-band monopole antenna.