论文名称为“THz 2-D frequency scanning planar integrated array antenna with improved efficiency”。该文报道了一种用于安检成像的太赫兹二维频扫阵列天线。该工作基于MEMS体硅微加工工艺，实现了用于太赫兹频段的硅微波导传输线。在此基础上，采用双层阶梯渐变缝隙单元设计了太赫兹漏波缝隙天线，实现阵列H面的波束扫描，该辐射单元可解决太赫兹频段下缝隙变厚辐射能力减弱和漏波天线扫描增益不平坦的问题。同时，基于硅微波导的色散效应设计了不等长移相器并实现了渐进式馈电移相网络，实现阵列E面的波束扫描。进一步，通过宽带高效的E面弯角过渡结构将馈电网络折叠实现整个天线的紧凑化布局，来减小天线口径面积提高天线口径效率。工作主要完成人姚仕森、程钰间、吴亚飞、杨海宁。

论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsptp=&arnumber=9385843

Abstract—A THz 2-D frequency scanning planar integrated array antenna is developed in this letter. Eight THz leaky-wave antennas are combined with a true-time-delay (TTD) phase-shifting feeding network to steer the beam in two directions by sweeping the frequency. Several H-plane 90° bends with linearly increased length are adopted to achieve the scalable TTD phase shift. The feeding lines are closely spaced to reduce the phase-shifting network occupied area in this progressive phase-shifting scheme. Besides, the E-plane 180° bend is used to construct the double-layer phaseshifting network, maintain the number of multiple scanning sweeps and improve the aperture efficiency. Moreover, in the used microelectromechanical systems (MEMS) fabrication technique, the minimum height of the radiation slot is 0.2 mm, which is too thick and deteriorates the radiating performance. When the double-layer step-profiled radiating slot is used instead of the thick slot, a THz leaky-wave antenna with higher radiation efficiency and better gain flatness can be achieved. Finally, a prototype antenna is fabricated and experimentally validated. The operating frequency range is 325–400 GHz and the beam scanning range is 22.7° × 60° with a maximum radiation gain of 25.28 dBi.

Index Terms—Double-layer folded tree-time-delay (TTD) phaseshifting network, frequency scanning, leaky-wave antenna, THz band.