A Wideband Circularly Polarized Horn Antenna With a Tapered Elliptical Waveguide Polarizer

This paper proposes a circularly polarized horn antenna with tapered elliptical waveguide and it employs a tapered elliptical waveguide polarizer to achieve wideband circular polarization. The prototype of the proposed antenna is processed through simulation and optimization. The fabricated antenna realizes the result, S(1, 1) <; -10 dB and AR <; 3 dB from 170 to 260 GHz, by measurement. Both the 3 dB AR bandwidth and the impedance bandwidth are 41.86% (170-260 GHz). The RCHP far-field pattern and the gain of the proposed antenna are measured as well. The proposed antenna achieves a gain of 24.4-31.3 dB (0.3 dB) from 170 to 260 GHz. Therefore, this paper finally comes to the conclusion that it is quite convenient for the structure of the proposed antenna to be machined at millimeter- and submillimeter-wave bands and employed in the application of communication and radar.