Design of a Ka-Band Circularly Polarized Waveguide Antenna with a Cross Iris

초록

In this paper, a Ka-band circularly polarized (CP) waveguide antenna with a cross iris is proposed. In order to achieve the CP characteristic of the antenna, a hexagonal shaped cavity is used. By using a cross iris, the axial ratio bandwidth is broadened. The 3-dB axial ratio bandwidth is 6480 MHz (31.97 – 38.45 GHz). The impedance matching is optimized by adjusting the proper sizes of a hexagonal cavity and a radiation slot. The 10-dB return loss bandwidth is 6840 MHz (31.74 – 38.58 GHz). The peak gains of the proposed antenna are 9.11 dBi at 33.5 GHz and 8.72 dBi at 37.6 GHz, respectively.

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