期刊
JOURNAL OF ELECTROMAGNETIC ENGINEERING AND SCIENCE
卷 22, 期 3, 页码 379-385出版社
KOREAN INST ELECTROMAGNETIC ENGINEERING & SCIENCE
DOI: 10.26866/jees.2022.3.r.100
关键词
Axial Ratio; Circular Polarization; Monopole Antenna; Ultra-Wideband Width
A new design method for an ultra-wideband circularly polarized microstrip-fed monopole antenna with a ground defect is proposed, which achieves ultra-wideband circular polarization performance through the parallelogram-shaped ground defect on the bottom layer.
A new design method for an ultra-wideband circularly polarized microstrip-fed monopole antenna with a ground defect is proposed in this paper. To achieve ultra-wideband circular polarization performance, a parallelogram-shaped ground defect is employed in the bottom layer. The analysis of the ultra-wideband axial ratio (AR) and the impedance bandwidth of the proposed antenna is performed both in the top and bottom layers. A semi-circular aperture is designed to achieve impedance matching in the 24-40 GHz frequency range. Then, the AR bandwidth is discussed considering the surface current distribution produced by the parallelogram-shaped ground defect to rote current in each orthogonal phase. A prototype of the proposed circularly polarized antenna with a 50% ultra-wide bandwidth (from 24 to 40 GHz), a 10-dB return loss, and a 3-dB AR was fabricated and measured. A 6-dBic right-hand circular polarization gain was also achieved.
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