Directivity Control by Asymmetrically Fed Dipole Antenna with PIN Diode Switches

Yuuya HOSHINO  Akira SAITOU  Kazuhiko HONJO  

IEICE TRANSACTIONS on Communications   Vol.E95-B    No.1    pp.106-108
Publication Date: 2012/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.106
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
multiple-input multiple-output (MIMO),  reconfigurable antennas,  channel capacity,  antenna radiation patterns,  

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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).