Summary
International Symposium on Antennas and Propagation
2008
Session Number:3C29
Session:
Number:3C29-5
Reduction of Mutual Coupling for Diversity Antenna with Folded Parasitic Element
Takafumi OHISHI, Noriaki OODACHI, Shuichi OBAYASHI, Hiroki SHOKI,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
Wireless LAN systems employ antenna diversity for reducing multipath fading. When several antennas are closely mounted, the radiation efficiency usually decreases due to mutual coupling between the antennas. Several methods to reduce mutual coupling between antennas have been reported [1]-[3]. These methods require too much space for them to be applied in a cellular phone or a mobile terminal. In Reference [3], a slit is used in the ground plane to change the current distribution on the ground plane and then the mutual coupling between the antennas decreases. It is usually difficult to make a slit in the ground plane, because the circuit components are mounted on the same ground plane where a diversity antenna is installed. Measures suitable for a cellular phone or a mobile terminal are needed to improve the radiation efficiency. In this paper, we propose a new method in which a folded parasitic element is introduced on a finite ground plane to control the current on the ground plane and to improve the radiation efficiency.