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.

腔背隙缝隙天线覆盖了整个Ku波段卫星通信频段（10.5-14.5 GHz），并使用3D打印和传统金属铣削进行设计和制造，以进行性能比较。向四个腔背辐射槽馈送一个波导孔，并沿着孔磁场放置一个短截线，以提高天线增益并减少槽之间的相互耦合。对于两个天线，测得的分数带宽均为38％。对于3D打印和全金属版本，目标带宽中的测量增益分别高达13.1 dBi和13.5 dBi。整个频段内，E平面的平均HPBW为34°。包括短截线和馈电波导在内的中心频率处的天线高度仅为0.78λ，其横向尺寸为1.51λx1.82λ。宽带，高增益，重量轻，