Abstract
In this letter, a new differential receiving-transmitting (R-T) unit cell for a wideband circularly polarized transmitarray antenna (CPTA) is presented. The proposed unit cell consists of a rotational symmetric half U-slot patch (HUSP) pair for the receiving part and a two-arm spiral antenna for the transmitting part. The rotational symmetric HUSP pair generates the wideband differential currents. To produce high-gain CP directive radiation based on the phase compensation principle, a spatially dependent rotation angle is imposed on the transmitter, and a mirror symmetry is applied in the y-direction for the receiver to implement the required transmission phase. The proposed CPTA based on the designed element not only exhibits a wide measured 3-dB axial ratio (AR) bandwidth of 61.9% (15.5-29.4 GHz), but also yields a significant 3-dB gain bandwidth of 47.4% (17.7-28.7 GHz). In addition, the CPTA demonstrates an acceptable peak aperture efficiency (50.7%). © 2025 IEEE.
| Original language | English |
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| Journal | IEEE Antennas and Wireless Propagation Letters |
| DOIs | |
| Publication status | Online published - 25 Feb 2025 |
Funding
This work was supported in part by the Guangdong Basic and Applied Basic Research Foundation under Grant 2024A1515010254; in part by the Shenzhen Science and Technology Program under Grant ZDSYS20220527171402005, Grant SGDX20230821100459006, and Grant KJZD20240903100200001; and in part by the State Key Laboratory of Radio Frequency Heterogeneous Integration (Independent Scientific Research Program No. 2024005).
Research Keywords
- Circularly polarized (cp)
- differential unit cell
- half u-slot patch (husp)
- transmitarray antenna (ta)
- wideband