Abstract A half mode substrate integrated waveguide (HMSIW) based leaky wave antenna (LWA) featuring low cross-polarization is proposed in this paper. The umbrella-shaped slot (the combination of longitudinal and transverse slots) is etched on the top layer of HMSIW LWA to get the efficient broadside radiation. The scanning range is obtained from −47° to +30° in a frequency range of 8.3 to 15.1 GHz. The cross-polarization level for the LWA is around −10 dB at broadside. In order to improve the cross-polarization levels in HMSIW LWA, two antennas are placed face to face obtaining the balanced symmetry across the longitudinal axis. Both the simulated and measured results show that the antenna is able to scan continuously from backward to forward direction with a very good low cross-polarization level. The developed prototype is capable of continuous beam scan from −29° to +32° in an operating frequency band of 9.2 to 15 GHz with a maximum gain of 13.5 dBi. The measured cross-polarization level is −30 dB which is quite low for the main beam at the broadside direction.

中文翻译：

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低交叉极化半模基片集成波导漏波天线

摘要 本文提出了一种低交叉极化的基于半模基片集成波导（HMSIW）的漏波天线（LWA）。在HMSIW LWA的顶层蚀刻伞形槽（纵向和横向槽的组合）以获得有效的宽边辐射。扫描范围为 -47° 至 +30°，频率范围为 8.3 至 15.1 GHz。LWA 的交叉极化水平在宽边约为 -10 dB。为了提高 HMSIW LWA 中的交叉极化水平，两个天线面对面放置，以获得跨纵轴的平衡对称。模拟和测量结果都表明天线能够从后向向前连续扫描，具有非常好的低交叉极化水平。开发的原型能够在 9.2 至 15 GHz 的工作频段内进行 -29° 至 +32° 的连续波束扫描，最大增益为 13.5 dBi。测得的交叉极化电平为 -30 dB，这对于宽边方向的主波束来说非常低。