Summary
International Symposium on Antennas and Propagation
2010
Session Number:2WC1
Session:
Number:2WC1-11
Polarization switching of ring microstrip antennas fed by an L-probe with PIN diodes
Kenta Yamaura, Yuichi Kimura, Misao Haneishi,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Microstrip antennas (MSAs) are widely used for various purposes such as mobile communications and satellite communications due to its low profile, lightweight, and simple configuration [1]-[2]. The authors have developed a multi-ring MSA for multi-band operation [3]- [4]. This antenna consists of multiple square ring patches corresponding to number of operation frequencies and an L-probe for feeding them. Each ring patch radiates either linear polarization or circular polarization by tuning truncated corners of the patch. On the other hand, polarization control of microstrip antennas with PIN diodes is reported by many papers [5]-[8]. In order to realize a multi-band planar antenna for switchable polarization, this paper presents performance of polarization switching of ring MSAs with PIN diodes. By changing ON and OFF of two PIN diodes on adjacent corners of a square ring patch, orthogonal currents are excited on the ring patch. Thus, orthogonal linear polarizations can be switched by bias currents of the PIN diodes. Two types of bias circuits for PIN diodes, on the same layer as the ring patch and on the backside of the ground plane, are discussed for one ring MSA. Then, the latter type of the bias circuit is applied to two ring MSAs for dual band operation.