The Mutual Coupling Reduction between Two J-Shaped Folded Monopole Antennas for Handset

Jun ITOH  Nguyen TUAN HUNG  Hisashi MORISHITA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.5   pp.1161-1167
Publication Date: 2011/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1161
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Diversification of Wireless Technologies)
Category: Antennas and Antenna Measurement
Keyword: 
small antenna for handset,  mutual coupling reduction,  

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Summary: 
In this study, we propose a method to reduce the mutual coupling between two J-shaped folded monopole antennas (JFMAs), which cover the IEEE 802.11 b/g (2400-2484 MHz) band. First, the change in mutual coupling with the spacing between the two antenna elements is investigated by considering two feeding models, and the effects of changes in the coupling on the antenna efficiency are studied. Subsequently, we try the method to reduce mutual coupling, the method involves the use of a bridge line that links the two antennas. The mutual coupling can be significantly reduced and the total antenna efficiency can be improved by linking two shorting strips with the bridge line. In a past study, we had found that in the case of L-shaped folded monopole antennas (LFMAs), the mutual coupling and antenna efficiency vary with the linking location on the bridge line. Moreover, we compare the characteristics of the LFMA and JFMA and show that the JFMA is effective when miniaturized.