Wideband and Low-Profile Omnidirectional Circularly Polarized Antenna With Slits and Shorting-Vias

A novel wideband and low-profile omnidirectional circularly polarized (CP) patch antenna is proposed. The antenna is constructed on a via-shorted circular patch with slits cut on the bottom and top planes. By loading vias on the circular patch antenna, the TM 01 mode is generated and coupled to the...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2016, Vol.15, p.686-689
Main Authors: Shi, Yuzhong, Liu, Juhua
Format: Article
Language:English
Subjects:
Antenna measurements
Antenna radiation patterns
Broadband antennas
Circularly polarized antenna
low profile
omnidirectional radiation
Patch antennas
shorting-vias
slits
Wideband
wideband antenna
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Summary:A novel wideband and low-profile omnidirectional circularly polarized (CP) patch antenna is proposed. The antenna is constructed on a via-shorted circular patch with slits cut on the bottom and top planes. By loading vias on the circular patch antenna, the TM 01 mode is generated and coupled to the original TM 02 mode. Then, a wide bandwidth is achieved. Moreover, the asymmetrically placed slits will generate a horizontal polarization, while the nonslit monopolar antenna will provide a vertical polarization. With a quadrature phase difference and equal amplitudes for the two orthogonal polarizations, a CP radiation could then be obtained. A prototype is fabricated and measured. With a low profile of 0.028λ 0 , the antenna has a 10-dB return-loss impedance bandwidth of 16.6% and a 3-dB axial-ratio bandwidth of 14.8%.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2015.2469277