Compact Dual-Band OAM Antenna Via Mirrored UCA with Hybrid Stubs and Slots: IEEE UCMMT 2025

With the rapid development of communication technologies such as the fifth generation (5 G), the demand for channel capacity and spectrum efficiency is increasing. This paper proposes a compact dual-band multi-mode orbital angular momentum (OAM) antenna array for enhanced spectrum utilization. The design features rectangular patch elements integrated with an E-shaped slot and a folded L-shaped stub, enabling independent control of S-band ($2.15-2.20 \text{GHz}$) and C band $(4.90-5.70 \text{GHz})$ resonances. Through parametric optimization, a mirror-symmetric uniform circular array (MSUCA) is implemented, generating OAM modes $l=0$, $\pm 1$ across both low-frequency (2.15-2.20 GHz) and high-frequency (4.905.70 GHz) bands.