Polarization Switchable Microstrip Antenna Using PIN Diodes

Dongkeun JUNG
Nagahisa MITA
Cheunsoo HA

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.1    pp.152-157
Publication Date: 2004/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
patch antenna,  polarization switching,  PIN diode,  slot coupling,  diversity,  

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A polarization switchable slot-coupled microstrip antenna using PIN diodes is proposed and studied. The microstrip feed line installed behind the ground plane is divided into two branches and each tip of the branches is connected to the ground plane through a PIN diode. One of the diodes is oriented from the tip to the ground plane and the other is oriented from the ground to the tip so that a slot in the ground can be selected to feed the patch by switching the dc bias between positive and negative. This selection contributes to switch the polarization between horizontal and vertical. In this paper, the authors investigate the polarization switching antenna theoretically and experimentally and confirmed sufficient differencce of antenna gain between horizontal and vertical polarization.