請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/97457完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳士元 | zh_TW |
| dc.contributor.advisor | Shih-Yuan Chen | en |
| dc.contributor.author | 程博文 | zh_TW |
| dc.contributor.author | Louis-Charles Olivier Ippet-Letembet | en |
| dc.date.accessioned | 2025-06-18T16:13:44Z | - |
| dc.date.available | 2025-06-19 | - |
| dc.date.copyright | 2025-06-18 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-06-12 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/97457 | - |
| dc.description.abstract | 本研究提出一個二維的解析模型，可用以分析在 GHz 頻段運作的薄膜體聲波諧振器 (FBAR) 和固嵌式諧振器 (SMR) 的應變耦合多鐵性天線。將傳統的梅森模型擴展到二維，我們所提出的解析方法能夠全面分析各種聲波諧振器配置下的輻射性能，包括不同的拓撲結構（FBAR 和 SMR）和激發模態（厚度剪切模態和厚度伸展模態）。該模型透過考慮 GHz 輻射固有的頻率相關機械和電氣限制來評估天線性能，並計算 GHz 和 Akhiezer 區域內的效率-頻寬乘積。與朱氏極限的比較分析表明，聲子-聲子散射才是這些元件輻射效率的主要限制因素，而非朱氏極限。
此外，利用高品質因子體聲波諧振器設計的啟發，我們提出了優化多鐵性天線的指導方針，其中包含基於 SMR 的設計，利用布拉格反射器實現厚度伸展波和厚度剪切波的雙波反射，並結合周圍增厚的結構來抑制各種幾何配置中的雜散模態。 最後，本論文透過磁彈性波色散圖，探討了多鐵性天線中可用於提升輻射效率的磁彈性耦合。我們的分析顯示，磁和聲波模態之間的交互作用強度在很大程度上取決於外加偏壓磁場的方向（共平面方向或平面法向量方向）和波數，從而導致強耦合或弱耦合。這些發現為提升多鐵性天線在 GHz 頻段的性能指引出一條途徑。 | zh_TW |
| dc.description.abstract | This study introduces a two-dimensional closed-form model for thin-film bulk acoustic resonator (FBAR) and solidly mounted resonator (SMR) strain-mediated multiferroic antennas operating in the GHz regime, extending the traditional Mason model to two dimensions. The proposed analytical framework enables a comprehensive analysis of radiation performance across various acoustic resonator configurations, including different topologies (FBAR and SMR) and excitation modes (thickness shear (TS) and thickness extensional (TE) modes). The model evaluates antenna performance by addressing the frequency-dependent mechanical and electrical limitations inherent to GHz radiation, computing efficiency-bandwidth products within the GHz and Akhiezer regimes. Comparative analysis with Chu's limit reveals that phonon-phonon scattering, rather than Chu's limit, predominantly constrains radiation efficiency in these devices.
Furthermore, leveraging insights from high-quality factor bulk acoustic wave (BAW) resonator design, we propose guidelines for optimizing multiferroic antennas, incorporating SMR-based designs with Bragg reflectors for dual-wave reflection of thickness extensional and thickness shear waves, alongside raised frames to suppress spurious modes across diverse geometric configurations. Finally, the magnetoelastic coupling in multiferroic antennas for boosting radiation efficiency is explored through magnetoelastic wave dispersion diagrams. The analysis shows that the interaction strength between magnetic and acoustic modes depends heavily on the external bias magnetic field's direction (in-plane or out-of-plane), and the wavenumber, leading to either robust or weak coupling. These findings offer a pathway to enhance the performance of multiferroic antennas in GHz applications. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-06-18T16:13:44Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-06-18T16:13:44Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | Verification Letter from the Oral Examination Committee i
Acknowledgements iii 摘要 v Abstract vi Contents viii List of Figures xi List of Tables xvi Denotation xvii Chapter 1 Motivation and Background 1 1.1 Introduction to multiferroic materials 1 1.1.1 Single phase multiferroic materials 1 1.1.2 Composite multiferroic materials 4 1.2 Introduction to the magnetoelectric coupling 5 1.2.1 Linear magnetoelectric effect 5 1.2.2 Magnetoelectric effect in composite piezoelectric-piezomagnetic multiferroics 6 1.2.3 Magnetoelectric effect in composite piezoelectric-magnetostrictive multiferroics 7 1.2.4 Dynamic magnetoelectric coupling in composite piezoelectric-ferromagnetic multiferroics 8 1.3 New applications of composite piezoelectric-ferromagnetic multiferroics 13 1.3.1 Strain-mediated MRAM 13 1.3.2 Strain-clocked nanomagnetic logic 17 1.3.3 Nanoscale multiferroic electromagnetic motors 20 1.3.4 Strain-mediated multiferroic antennas 21 1.4 Contribution of this work 27 1.5 Dissertation organization 28 Chapter 2 Modeling and analysis of strain-mediated multiferroic antennas at GHz band 30 2.1 Unidirectionally-fully-coupled 2D closed-form model of multiferroic antennas 30 2.1.1 Two-dimensional Mason model for FBAR and SMR resonators under TS and TE mode excitations 31 2.1.2 Radiation of multiferroic antennas 44 2.2 Radiation limitation of multiferroic antennas at the GHz range: Chu’s and Akhiezer limits 54 Chapter 3 Design of strain-mediated multiferroic antennas at GHz band 59 3.1 Acoustic resonators’ loss mechanisms and figure of merit 59 3.2 Dispersion diagram of lamb waves in BAW resonators 61 3.3 Bragg reflector design for Solidly-Mounted-Resonators based multiferroic antennas 63 3.4 Spurious modes suppression techniques 68 3.5 Magnetoelastic coupling in multiferroic antennas 74 Chapter 4 Conclusion 82 Bibliography 85 | - |
| dc.language.iso | en | - |
| dc.subject | 固嵌式諧振器 | zh_TW |
| dc.subject | 應變耦合多鐵性天線 | zh_TW |
| dc.subject | 擴展梅森模型 | zh_TW |
| dc.subject | 厚度剪切模態 | zh_TW |
| dc.subject | 厚度伸展模態 | zh_TW |
| dc.subject | Akhiezer 區域 | zh_TW |
| dc.subject | 磁彈性耦合 | zh_TW |
| dc.subject | 磁彈性波色散圖 | zh_TW |
| dc.subject | 薄膜體聲波諧振器 | zh_TW |
| dc.subject | Akhiezer regime | en |
| dc.subject | thin-film bulk acoustic resonator (FBAR) | en |
| dc.subject | solidly mounted resonator (SMR) | en |
| dc.subject | strain-mediated multiferroic antennas | en |
| dc.subject | Extended Mason model | en |
| dc.subject | thickness shear (TS) mode | en |
| dc.subject | thickness extensional (TE) mode | en |
| dc.subject | Magnetoelastic coupling | en |
| dc.subject | magnetoelastic wave dispersion diagrams | en |
| dc.title | 操作於 GHz 頻段之應變耦合多鐵性天線之建模與設計 | zh_TW |
| dc.title | Modeling and design of strain-mediated multiferroic antennas operating in the GHz frequency band | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 博士 | - |
| dc.contributor.coadvisor | Robert N. Candler | zh_TW |
| dc.contributor.coadvisor | Robert N. Candler | en |
| dc.contributor.oralexamcommittee | 陳念偉;李銘晃;李尉彰;吳文中;劉建豪 | zh_TW |
| dc.contributor.oralexamcommittee | Nan-Wei Chen;Ming-Huang Li;Wei-Chang Li;Wen-Jong Wu;Chien-Hao Liu | en |
| dc.subject.keyword | 薄膜體聲波諧振器,固嵌式諧振器,應變耦合多鐵性天線,擴展梅森模型,厚度剪切模態,厚度伸展模態,Akhiezer 區域,磁彈性耦合,磁彈性波色散圖, | zh_TW |
| dc.subject.keyword | thin-film bulk acoustic resonator (FBAR),solidly mounted resonator (SMR),strain-mediated multiferroic antennas,Extended Mason model,thickness shear (TS) mode,thickness extensional (TE) mode,Magnetoelastic coupling,magnetoelastic wave dispersion diagrams,Akhiezer regime, | en |
| dc.relation.page | 94 | - |
| dc.identifier.doi | 10.6342/NTU202501062 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2025-06-12 | - |
| dc.contributor.author-college | 電機資訊學院 | - |
| dc.contributor.author-dept | 電信工程學研究所 | - |
| dc.date.embargo-lift | 2025-06-19 | - |
| 顯示於系所單位： | 電信工程學研究所 | |
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| ntu-113-2.pdf | 13.09 MB | Adobe PDF | 檢視/開啟 |
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