Abstract
In the paper, a singly fed circular patch antenna with polarization diversity is proposed, and its binary array for MIMO application is explored as well. The air substrate and aperture-coupled feed structure are adopted to increase bandwidth and simplify the bias circuit of PIN diodes. By controlling the states of four PIN diodes on the patch, the proposed antenna can produce linear polarization (LP), left- or right-hand circular polarization (LHCP or RHCP). For each polarization sense, the antenna exhibits wide impedance bandwidth, high gain and low cross-polarization. Two antennas are orthogonally placed to form a binary array for MIMO application, which has high isolation and low envelope correlation. The antenna and its array have advantages of simple biasing network, easy fabrication and adjustment, which can be widely applied in wireless communication systems.
Funding statement: Funding: National Natural Science Foundation of China, (Grant / Award Number: ‘60872029’, ‘61172115’)
Acknowledgments
This work was supported by the National Natural Science Foundation of China (No.61172115 and No.60872029), the High-Tech Research and Development Program of China (No. 2008AA01Z206), the Aeronautics Foundation of China (No.20100180003), the Fundamental Research Funds for the Central Universities (No. ZYGX2009J037), and Project 9140A07030513DZ02098.
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