A Multi-linear Polarization Reconfigurable Unidirectional Patch Antenna

A novel multi-linear polarization (multi-LP) reconfigurable unidirectional circular patch antenna is proposed, which can switch among four LPs at every 45° rotation. The patch antenna is fed in the center and shorting posts are used to excite TM11 mode with LP. By controlling the connections between...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2017-08, Vol.65 (8), p.4299-4304
Main Authors: Shu-Lin Chen, Feng Wei, Pei-Yuan Qin, Guo, Y. Jay, Xi Chen
Format: Article
Language:English
Subjects:
Antenna measurements
Antennas
Circularity
Ground plane
Impedance
Linear polarization
Multi-linear polarization (Multi-LP)
patch antenna
Patch antennas
PIN diodes
Polarization
polarization reconfigurable antenna
reconfigurable antenna
Resonant frequency
Substrates
Switches
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Summary:A novel multi-linear polarization (multi-LP) reconfigurable unidirectional circular patch antenna is proposed, which can switch among four LPs at every 45° rotation. The patch antenna is fed in the center and shorting posts are used to excite TM11 mode with LP. By controlling the connections between the four shorting posts and the ground plane using p-i-n diodes, four reconfigurable polarization states atφ=0°,φ=45°,φ=90°,orφ=135°canberealized.Thesize of this antenna is about 0.57λ × 0.57λ × 0.07λ at 2.45 GHz. It can be easily fabricated and has a simple biasing network. The measured overlapping impedance bandwidth for different polarizations under the condition |S11| ≤ -10 dB is from 2.33 to 2.50 GHz, which agrees well with the simulated one. Moreover, the antenna maintains stable radiation patterns and the measured realized gains range from 5.3 to 5.9 dBi.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2017.2712185