| Abstract | A novel conical horn antenna for full-duplex wireless communication with a dielectric polarizing insert and a flare-angle change is presented. Both orthogonal linear polarizations of the circular waveguide feed, caring transmitter and receiver signals without any cross coupling between them in the ideal case, are transformed to/from the same circular polarization in free space which left- or right- handedness is determined by the direction of insert twist. The polarizer consists of a quadruplet of equidistant dielectric ridges twisted to inscribe conical spirals on the inner metal horn wall. The continuing horn wall towards the aperture with increased flare not only improves the antenna gain but also supports the initiated circular wave polarization. For antenna designed for the 3dB axial ratio frequency band 25.1-28.9 GHz, full-wave electromagnetic simulation shows return loss greater than 14 dB, boresight directivity between 18.7 and 19.8 dBi, and exceptional Tx-Rx isolation greater that 70 dB. The proposed antenna enables directed same-frequency full-duplex capability with benefits of circular polarization and no additional radiating units needed at one node, while avoiding spending additional polarization resource in the communication channel. |
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