A Compact Ultra-Wideband Circularly Polarized Antenna Based on Miniaturized Phase Shifter
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908600652267520 |
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| author | Xu, Han-Jie Qu, Shi-Wei |
| author_facet | Xu, Han-Jie Qu, Shi-Wei |
| contents | In this article, a compact wideband circularly polarized antenna based on a miniaturized phase shifter with ultra-wideband operation is proposed. The proposed antenna is comprised of a pair of compact orthogonal ultra-wideband Vivaldi antennas and a miniaturized phase shifter. To achieve wideband impedance matching and miniaturization, parasitic radiation structures, metal coupled plates, and Γ-type balun with high-impedance transmission lines are designed. After optimization, the final antenna dimensions are only 0.36 lambda x 0.36 lambda x 0.34 lambda, where lambda is the free-space wavelength at the lowest operating frequency. Additionally, the miniaturized 90 degrees wideband phase shifter of the antenna is designed by employing a PI-type network and a negative group delay (NGD) network with extremely compact dimensions of 0.071 lambda x 0.047 lambda. The simulated results indicate that the antenna exhibits a 10-dB impedance bandwidth within 0.32 - 1.2 GHz (3.75:1) and a 3-dB axial ratio (AR) bandwidth within 0.32 - 1.15 GHz (3.59:1). Finally, a prototype is fabricated and reasonable agreement is achieved between the simulated and measured results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_16287 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Compact Ultra-Wideband Circularly Polarized Antenna Based on Miniaturized Phase Shifter Xu, Han-Jie Qu, Shi-Wei Optics Applied Physics In this article, a compact wideband circularly polarized antenna based on a miniaturized phase shifter with ultra-wideband operation is proposed. The proposed antenna is comprised of a pair of compact orthogonal ultra-wideband Vivaldi antennas and a miniaturized phase shifter. To achieve wideband impedance matching and miniaturization, parasitic radiation structures, metal coupled plates, and Γ-type balun with high-impedance transmission lines are designed. After optimization, the final antenna dimensions are only 0.36 lambda x 0.36 lambda x 0.34 lambda, where lambda is the free-space wavelength at the lowest operating frequency. Additionally, the miniaturized 90 degrees wideband phase shifter of the antenna is designed by employing a PI-type network and a negative group delay (NGD) network with extremely compact dimensions of 0.071 lambda x 0.047 lambda. The simulated results indicate that the antenna exhibits a 10-dB impedance bandwidth within 0.32 - 1.2 GHz (3.75:1) and a 3-dB axial ratio (AR) bandwidth within 0.32 - 1.15 GHz (3.59:1). Finally, a prototype is fabricated and reasonable agreement is achieved between the simulated and measured results. |
| title | A Compact Ultra-Wideband Circularly Polarized Antenna Based on Miniaturized Phase Shifter |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2510.16287 |