Millimeter-Wave Omni-Directional Antenna for B5G/6G Communications

This paper introduces a novel circular waveguide omni-directional antenna designed for B5G/6G communications operating in the 37–40 GHz frequency band. The antenna employs a differential feeding technique to achieve an omni-directional radiation pattern by exciting the low-loss TE
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mode, ensuring a circular mode pattern with minimal signal degradation. A carefully crafted feeding network is integrated with the antenna structure to efficiently excite the desired mode. The resulting design demonstrates excellent impedance matching and a flat gain response across the targeted bandwidth, making it well-suited for next-generation communication systems requiring high-performance millimeter-wave antennas. Furthermore, due to its primarily metallic structure, the antenna exhibits suitability for high-power applications, promising robustness and reliability in demanding operational environments.