A Low-Profile and Wideband Circularly Polarized Patch Antenna Based on TM11 and TM21
IEEE Transactions on Antennas and Propagation(2021)
Abstract
In this article, a low-profile and wideband circularly polarized patch antenna is proposed and developed, which is composed of the circular patch fed by four ports. A wideband property is achieved by utilizing TM
11
and TM
21
mode, as well as the orthogonal mode of TM
11
. The Γ-shaped feed is employed to stimulate the TM
21
mode. Besides, due to the parasitic radiation from the face-to-face Γ-shaped feeds with opposite phase, the radiation peak of the circular patch under TM
21
mode is along the broadside direction, which is different from the original radiation mechanism of TM
21
mode. By loading shorting pins in the middle area of circular patch, the polarization orthogonal mode of the fundamental mode (TM
11
) is excited properly, which contributed to bandwidth enhancement. Cooperated with the quadrature phase feed network, a wideband circular patch antenna with unidirectional radiation and circular polarization properties is designed, fabricated, and measured. The size of the circular patch is 0.57λ
0
×0.57 λ
0
and the height is only 0.053λ
0
( λ
0
is the free space wavelength at the center frequency). The measured results show that the 109% of fractional bandwidth is obtained under the condition of VSWR <; 2, ranging from 0.94 to 3.18 GHz, and the 3 dB axial ratio fractional bandwidth is 95%, ranging from 1.04 to 2.93 GHz. Besides the realized LHCP gain >3 dBic from 1.27 to 2.99 GHz.
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Key words
Antenna,circular polarization,circular patch,low profile,wideband
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