A millimeter-wave substrate-integrated waveguide (SIW) antenna with the ability of generating 2-D steerable large depth-of-field beam is presented in this article. First, a transverse antenna topology feeding with the series- and the parallel-network is employed to generate the limited-diffractive beam with large depth of field to overcome the problem that the conventional radial generator cannot steer its beam electronically. The proposed antenna is achieved by combining a modulated leaky-wave slot array antenna with a modified multibeam SIW parabolic reflector. The modulated leaky-wave slot array with stepped-width is designed to able to steer the limited-diffractive beam in the horizontal dimension with the frequency, which validates the frequency scanning feasibility of the limited-diffractive beam. Then a modified SIW parabolic reflector with matching loads is used to feed the modulated leaky-wave SIW slot array antenna to generate multiple limited-diffractive beams in the vertical dimension. A large depth of field of about $43\lambda _{0}$ is achieved of the central limited-diffractive beam. The measurements are in good agreement with the simulated results.

中文翻译：

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通过带有改进抛物面反射器的漏波天线阵列产生和二维控制大景深波束

本文介绍了一种能够产生二维可控大景深波束的毫米波基板集成波导 (SIW) 天线。首先，采用串联和并联网络馈电的横向天线拓扑来产生具有大景深的有限衍射波束，以克服传统径向发生器无法以电子方式控制波束的问题。所提出的天线是通过将调制漏波缝隙阵列天线与改进的多波束 SIW 抛物面反射器相结合来实现的。设计了具有阶梯宽度的调制漏波缝隙阵列，能够在水平维度上随频率控制有限衍射光束，验证了有限衍射光束频率扫描的可行性。然后使用具有匹配负载的改进的 SIW 抛物面反射器馈送调制漏波 SIW 缝隙阵列天线，以在垂直维度上生成多个有限衍射波束。中央有限衍射光束实现了大约 $43\lambda_{0}$ 的大景深。测量结果与模拟结果非常吻合。