Directivity Control by Asymmetrically Fed Dipole Antenna with PIN Diode Switches

Yuuya HOSHINO  Akira SAITOU  Kazuhiko HONJO 

Publication
IEICE TRANSACTIONS on Communications  Vol.E95-B  No.1  pp.106-108
Publication Date: 2012/01/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2010)
Category: Antennas
Keyword: 
multiple-input multiple-output (MIMO),  reconfigurable antennas,  channel capacity,  antenna radiation patterns, 

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Summary: 
A feed-point-selective, asymmetrically fed dipole antenna has been proposed for multiple-input multiple-output (MIMO) applications. By using PIN diode switches, an asymmetrical antenna feed is realized so as to control antenna directivities. The two basic requirements for MIMO antenna radiation patterns, namely, a decrease in overlap and control in direction, have been achieved. Additionally, to enhance directivities for the antenna with PIN diodes, a reflector has been introduced. The gain toward the reflector decreased by 2 dB, while the gain in the direction of the maximum gain increased by 2 dB. The developed antenna can correspond to a variable power angular spectrum (PAS).