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A Dual Polarized Inverted Quad-Ridged Feed Antenna in Millimeter Wave Compact Antenna Test Range for OTA Test

This paper presents a dual polarized inverted quadridged horn antenna which is used as a feed antenna in compact antenna test range (CATR) for millimeter wave OTA test. A rotationally symmetric inverted ridge is developed to excite the corrugated horn antenna and a balanced feeding network is employed to improve the cross-polarization performance. The relationship between the length of the inverted quad-ridge and 3dB beamwidth was studied. The operating frequency of the antenna proposed in this work is from 22 to 44 GHz. The prototype of the antenna was manufactured and measured. The measured port to port isolation is nearly less than -50 dB and the VSWR is lower than 2 over the entire working frequency band. The 3dB beamwidth of the E-plane and the H-plane is in the range of 50 degrees to 64 degrees.