A circularly polarized pyramidal horn antenna based on substrate integrated waveguide (SIW) technology is proposed and developed for Ku-band applications. The proposed horn antenna is excited by the upper and lower SICL differential feed networks placed vertically to each other, so that two orthogonal waveguide modes with the equal amplitude are generated at the horn aperture. A 90° coupling network based on SICL technology is proposed to achieve a 90° phase difference between the two orthogonal waveguide modes, thus realizing the function of left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) of the horn antenna. In addition, in order to make the phase distribution of the horn aperture more uniform, a cross metal strip structure at the horn aperture is proposed, thereby improving the radiation efficiency. The proposed horn antenna is manufactured by using low-cost printed circuit boards (PCBs) process. The measured results show that the proposed circularly polarized pyramidal horn operates at center frequency 12.5 GHz, the measured gain is 8.4 dBi, the relative standing wave and axial ratio (AR) bandwidth are approximately 24% and 5%, respectively. And the radiation aperture efficiency is as high as 78.5%. The developed circularly polarized pyramidal horn antenna can be applied in the field of satellite communications.

中文翻译：

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基于衬底集成波导的圆极化角锥喇叭天线

针对 Ku 波段应用，提出并开发了一种基于基板集成波导 (SIW) 技术的圆极化锥形喇叭天线。所提出的喇叭天线由彼此垂直放置的上下 SICL 差分馈电网络激励，从而在喇叭孔径处产生两个等幅的正交波导模式。提出了一种基于SICL技术的90°耦合网络，实现两个正交波导模式的90°相位差，从而实现喇叭的左旋圆极化（LHCP）和右旋圆极化（RHCP）功能天线。此外，为了使喇叭孔径的相位分布更加均匀，提出了喇叭孔径处的交叉金属条结构，从而提高了辐射效率。所提出的喇叭天线是通过使用低成本印刷电路板 (PCB) 工艺制造的。测量结果表明，所提出的圆极化锥形喇叭工作在中心频率12.5 GHz，测量增益为8.4 dBi，相对驻波和轴比（AR）带宽分别约为24%和5%。辐射孔径效率高达78.5%。研制的圆极化角锥喇叭天线可应用于卫星通信领域。分别。辐射孔径效率高达78.5%。研制的圆极化角锥喇叭天线可应用于卫星通信领域。分别。辐射孔径效率高达78.5%。研制的圆极化角锥喇叭天线可应用于卫星通信领域。