Abstract
Cavity backed slot antenna covering entire Ku-band satellite communications frequency band (10.5–14.5 GHz) is designed and manufactured using both 3D printing and traditional metal milling for performance comparison. Four cavity backed radiating slots are fed with a waveguide aperture and a stub along the aperture magnetic field is placed to improve the antenna gain and to reduce the mutual coupling among the slots. Measured fractional bandwidth is 38% for both antennas. Measured gain in the target bandwidth is up to 13.1 dBi and 13.5 dBi for 3D-printed and all-metallic variant, respectively. Average HPBW in E-plane is 34° throughout the band. Antenna height is only 0.78λ at the center frequency including the stub and the feed waveguide, and its transverse dimensions are 1.51λ by 1.82λ. Wideband, high-gain, light weight, and small form factor features of the proposed antenna can be used in array form for satellite and radiolink communications.
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