Impact of E-Plane Misalignment on THz Diagonal Horn Antennas

IF 3.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-08-26 DOI:10.1109/TTHZ.2024.3449792

Divya Jayasankar;Andre Koj;Jeffrey Hesler;Jan Stake

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Abstract

A key challenge in developing terahertz front-ends is achieving high coupling efficiency between the waveguide feed horn and the optical beam. In this article, we have quantified the alignment requirements for the widely used E-plane split diagonal horn antenna through theoretical analysis, electromagnetic simulation, and experimental validation within the 325–500 GHz frequency range. The results from our analytical models, simulations, and measurements are consistent and shows good agreement. They reveal that even minor geometric asymmetries can cause significant increases in fractional power radiated to the cross-polar component due to amplitude and phase imbalances in the TE

$_{10}$

and TE

$_{01}$

modes. Furthermore, a misalignment of approximately 8% of the wavelength was observed to result in a 3-dB degradation in the optical coupling to a Gaussian beam in middle of the waveguide band. These findings highlight the critical importance of precise alignment and feed horn machining for the successful implementation of terahertz front-end systems.

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e面不对准对太赫兹对角喇叭天线的影响

开发太赫兹前端的一个关键挑战是实现波导馈电喇叭与光束之间的高耦合效率。本文通过理论分析、电磁仿真和实验验证，在325-500 GHz频率范围内，对应用广泛的e平面劈裂对角喇叭天线的对准要求进行了量化。我们的分析模型、模拟和测量结果是一致的，显示出很好的一致性。结果表明，由于TE$_{10}$和TE$_{01}$模式的振幅和相位不平衡，即使很小的几何不对称也会导致辐射到交叉极分量的分数功率显著增加。此外，观察到大约8%波长的不对准导致波导带中部高斯光束的光学耦合下降3 db。这些发现强调了精确对准和进给角加工对于成功实现太赫兹前端系统的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Terahertz Science and Technology ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

7.10

自引率

9.40%

发文量

102

期刊介绍： IEEE Transactions on Terahertz Science and Technology focuses on original research on Terahertz theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of Terahertz waves.