A Pattern Reconfigurable Antenna with Broadband Circular Polarization

Guiping JIN  Dan LIU  Miaolan LI  Yuehui CUI  

IEICE TRANSACTIONS on Communications   Vol.E101-B    No.5    pp.1257-1261
Publication Date: 2018/05/01
Publicized: 2017/11/16
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3253
Type of Manuscript: PAPER
Category: Antennas and Propagation
reconfigurable antenna,  pattern reconfigurable antenna,  PIN diode,  circular polarization,  

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In this paper, a simple pattern reconfigurable antenna with broadband circular polarization is proposed. The proposed antenna consists of four rectangular loops, a feeding network and four reflectors. Circular polarization is achieved by cutting two slots on opposite sides of the loops. By controlling the states of the four PIN diodes present in the feeding network, the proposed antenna can achieve four different pattern modes at the same frequency. Experiments show that the antenna has a bandwidth of 47.6% covering 1.73-2.81GHz for reflection coefficient (|S11|)<-10dB and a bandwidth of 55% covering 1.62-2.85GHz for axial ratio <3dB. The average gain is 8.5dBi and the radiation patterns are stable.