This paper presents a super realized gain, circularly polarized strip-crossed dipole antenna operating at 3.5 GHz. Superdirective behavior is achieved by leveraging strong inter-element mutual coupling through careful adjustment of the strip dimensions. The antenna features a single driven element, with the other element passively loaded with a reactive impedance. The structure is optimized to maximize left-hand circularly polarized (LHCP) realized gain, ensuring high polarization purity and good impedance matching. The optimized design exhibits a 50 Ω impedance bandwidth of 3.29 - 4.17 GHz (23.75%) and an axial-ratio bandwidth of 3.43 - 3.57 GHz (4%). At 3.5 GHz, the antenna achieves a peak realized gain of 6.1 dB (ka≈1.65), with an axial ratio of 1.4 dB. These results demonstrate that circular polarization and superdirectivity can be simultaneously realized in a geometrically simple, low-profile (0.15λ) antenna, rendering it suitable for integration into compact sub-6~GHz wireless and sensing platforms.
@article{arxiv.2601.10292,
title = {Single-Feed Circularly Polarized Super Realized Gain Antenna},
author = {Georgia Psychogiou and Donal P. Lynch and Spyridon N. Daskalakis and Manos M. Tentzeris and George Goussetis and Stylianos D. Asimonis},
journal= {arXiv preprint arXiv:2601.10292},
year = {2026}
}