AUTHOR=Xiao Jun , Teni Geer , Li Hongmei , Ding Tongyu , Ye Qiubo 

TITLE=A Dual-Polarized Horn Antenna Covering Full Ka-Band Using Turnstile OMT

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.880606

DOI=10.3389/fphy.2022.880606

ISSN=2296-424X

ABSTRACT=<p>This article presents a dual-polarized corrugated horn antenna incorporated a turnstile orthomode transducer (OMT) covering the full <italic>K</italic>a-band (26.5–40 GHz). A three-stepped cylindrical tuning stub scattering element is designed in the turnstile junction to combine/split the two linearly polarized waves with high isolation. The proposed turnstile OMT shows a good simulated return loss better than 20 dB and a high isolation higher than 57 dB within the whole <italic>K</italic>a-band. Then, a corrugated horn antenna with five-stage choke rings is designed. Finally, the proposed horn antenna incorporated in the turnstile OMT is fabricated and measured. The measured impedance bandwidth for |S<sub>11/22</sub>|≤ −15 dB is 50.7% from 25 to 42 GHz. The measured peak gain is 11.9 dBi. The proposed antenna system is a promising candidate for the 5G millimeter-wave applications.</p>