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Title: Compact-size ultra-wideband circularly polarized antenna with stable gain and radiation pattern
Authors: Xu, Rui
Shen, Zhongxiang
Gao, Steven Shichang
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2021
Source: Xu, R., Shen, Z. & Gao, S. S. (2021). Compact-size ultra-wideband circularly polarized antenna with stable gain and radiation pattern. IEEE Transactions On Antennas and Propagation, 70(2), 943-952.
Journal: IEEE Transactions on Antennas and Propagation
Abstract: A novel ultra-wideband (UWB) circularly polarized (CP) antenna array with sequential phase feed is proposed in this article. The element implements a multiresonance monopole to achieve UWB CP radiation. To investigate the CP operating mechanism, characteristic mode analysis is used to provide different modes at various frequencies. The simulated characteristic mode analysis results show that this element can realize good CP at three independently adjustable frequencies (2.4, 3.8, and 5.8 GHz). By combining these three frequencies, a UWB CP antenna element is realized from 2.02 to 6.03 GHz for axial ratio (AR) less than 3.0 dB. Because the main radiating region of this element changes at different frequencies, a compact 2 × 2 array, whose profile is only 0.09λ (where λ is the wavelength in free space at the lowest operating frequency), is designed and optimized to achieve higher realized gain and stable radiation pattern. Subsequently, a prototype of this array is fabricated and measured. Measured results demonstrate an overlapping bandwidth of 120.9% from 1.8 to 7.3 GHz, in terms of the-10 dB reflection coefficient bandwidth and 3 dB AR bandwidth. This array has the advantages of simple structure, compact size, high gain, and stable pattern within the entire operating band.
ISSN: 0018-926X
DOI: 10.1109/TAP.2021.3111316
Rights: © 2021 IEEE. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles

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