Modeling of Multiferroic Antennas in the Akhiezer Regime: Effects of Acoustic Resonator Excitation and Topology on Radiation

IF 4.6 1区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Antennas and Propagation Pub Date : 2024-10-22 DOI:10.1109/TAP.2024.3481651

Louis-Charles Ippet-Letembet;Rui-Fu Xu;Robin Jeanty;Zhi Yao;Robert N. Candler;Shih-Yuan Chen

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Abstract

A 2-D closed-form model of multiferroic antennas in the GHz range is proposed. The model predicts the electrical and mode shape responses of film bulk acoustic resonators (FBARs) and solidly mounted resonators (SMRs) and provides a closed-form solution of the radiated electromagnetic (EM) field, enabling optimization of antenna parameters to maximize radiated power. Furthermore, the model is exploited to analyze the radiation performance of multiferroic antennas according to acoustic resonator topologies (FBAR and SMR) and excitation modes (thickness-extensional (TE) and thickness-shear (TS) modes). The analysis reveals that SMR-based antennas radiate less than FBAR-based ones due to substrate energy loss. In addition, antennas excited by TE modes can generate significantly more power than those excited by TS modes. Finally, we investigate the frequency-dependent mechanical and electrical limitations of radiation at GHz frequencies by comparing the efficiency-bandwidth products of different multiferroic antennas with Chu’s limit in the Akhiezer regime. The results suggest that phonon-phonon coupling of Akhiezer damping will be the primary limiting factor of antenna radiation at GHz frequencies, rather than Chu’s limit.

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多铁天线在Akhiezer状态下的建模：声谐振器激励和拓扑结构对辐射的影响

提出了一种GHz频段多铁性天线的二维封闭模型。该模型预测了薄膜体声谐振器（fbar）和固体安装谐振器（smr）的电响应和模态振型响应，并提供了辐射电磁场（EM）场的封闭解，从而可以优化天线参数以最大化辐射功率。此外，利用该模型分析了多铁性天线的辐射性能，包括声谐振腔拓扑结构（FBAR和SMR）和激励模式（厚度-拉伸（TE）和厚度-剪切（TS）模式）。分析表明，由于衬底能量损失，基于smr的天线比基于fbar的天线辐射更小。此外，TE模式激发的天线比TS模式激发的天线产生的功率要大得多。最后，我们通过比较不同多铁天线的效率-带宽乘积和Chu在Akhiezer条件下的极限，研究了GHz频率下辐射的机械和电气限制。结果表明，Akhiezer阻尼的声子-声子耦合将是GHz频率下天线辐射的主要限制因素，而不是Chu的极限。

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 Antennas and Propagation 工程技术-电信学

CiteScore

10.40

自引率

28.10%

发文量

968

审稿时长

4.7 months

期刊介绍： IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas, including design and development, and in the propagation of electromagnetic waves, including scattering, diffraction, and interaction with continuous media; and applications pertaining to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques