서브메뉴
검색
Non-Linear, Time-Variant and Reconfigurable Metasurfaces
Non-Linear, Time-Variant and Reconfigurable Metasurfaces
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151336
- ISBN
- 9798383217009
- DDC
- 537
- 저자명
- Yang, Xiaozhen.
- 서명/저자
- Non-Linear, Time-Variant and Reconfigurable Metasurfaces
- 발행사항
- [Sl] : University of California, San Diego, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 98 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
- 주기사항
- Advisor: Sievenpiper, Daniel F.
- 학위논문주기
- Thesis (Ph.D.)--University of California, San Diego, 2024.
- 초록/해제
- 요약Metasurfaces, constructed with periodic subwavelength meta-atoms, have aroused wide attention since it exhibits extraordinary electromagnetic behaviours in wave manipulation from microwave regime to optical ranges. Meanwhile the low-cost, ease of fabrication and compact features make it more appealing for various applications. Researchers have shown that conventional linear-time-invariant (LTI) metasurfaces are capable of energy absorption, beam formation, radiation control and polarization conversion. However, their abilities are limited since the electromagnetic (EM) response is unchangeable regardless of input power and phase.This dissertation discusses how to empower classic LTI metasurfaces with unconventional abilities by integrating nonlinear electronic devices. The integration of nonlinear device offers more degrees of freedom to metasurfaces, enabling versatile abilities to meet complex growing demands in EM protection, isolation and wave manipulation. This dissertation theoretically and experimentally demonstrates four novel non-LTI or reconfigurable metasurfaces designs with promising application value. First, we propose a broadband absorber beyond the Bode-Fano limit by creating an energy trap using time-modulated switch/diodes. The second design realizes power-dependent reflection, instead of absorption, to realize EM protection. The triggering of the integrated diodes directly transforms the structure from a surface wave supportive state to a self-induced bandgap topology if exposed to high power RF illumination. The third concept proposes an all-passive and magnetic-free structure integrated with diodes to achieve nonreciprocity, which is a promising candidate for EM protecting layers and EM isolators/circulators. The last proposed varactor-based reconfigurable metasurface focuses on multifunctional wave manipulation, including beam steering, polarization conversion and phase offset. All these proposed structures expand the capability of wave manipulation and their applications compared to traditional LTI metasurfaces.
- 일반주제명
- Electromagnetics
- 일반주제명
- Electrical engineering
- 키워드
- Metasurfaces
- 키워드
- Beam formation
- 기타저자
- University of California, San Diego Electrical and Computer Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017161294
■00520250211151336
■006m o d
■007cr#unu||||||||
■020 ▼a9798383217009
■035 ▼a(MiAaPQ)AAI31241826
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a537
■1001 ▼aYang, Xiaozhen.
■24510▼aNon-Linear, Time-Variant and Reconfigurable Metasurfaces
■260 ▼a[Sl]▼bUniversity of California, San Diego▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a98 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-01, Section: B.
■500 ▼aAdvisor: Sievenpiper, Daniel F.
■5021 ▼aThesis (Ph.D.)--University of California, San Diego, 2024.
■520 ▼aMetasurfaces, constructed with periodic subwavelength meta-atoms, have aroused wide attention since it exhibits extraordinary electromagnetic behaviours in wave manipulation from microwave regime to optical ranges. Meanwhile the low-cost, ease of fabrication and compact features make it more appealing for various applications. Researchers have shown that conventional linear-time-invariant (LTI) metasurfaces are capable of energy absorption, beam formation, radiation control and polarization conversion. However, their abilities are limited since the electromagnetic (EM) response is unchangeable regardless of input power and phase.This dissertation discusses how to empower classic LTI metasurfaces with unconventional abilities by integrating nonlinear electronic devices. The integration of nonlinear device offers more degrees of freedom to metasurfaces, enabling versatile abilities to meet complex growing demands in EM protection, isolation and wave manipulation. This dissertation theoretically and experimentally demonstrates four novel non-LTI or reconfigurable metasurfaces designs with promising application value. First, we propose a broadband absorber beyond the Bode-Fano limit by creating an energy trap using time-modulated switch/diodes. The second design realizes power-dependent reflection, instead of absorption, to realize EM protection. The triggering of the integrated diodes directly transforms the structure from a surface wave supportive state to a self-induced bandgap topology if exposed to high power RF illumination. The third concept proposes an all-passive and magnetic-free structure integrated with diodes to achieve nonreciprocity, which is a promising candidate for EM protecting layers and EM isolators/circulators. The last proposed varactor-based reconfigurable metasurface focuses on multifunctional wave manipulation, including beam steering, polarization conversion and phase offset. All these proposed structures expand the capability of wave manipulation and their applications compared to traditional LTI metasurfaces.
■590 ▼aSchool code: 0033.
■650 4▼aElectromagnetics
■650 4▼aElectrical engineering
■653 ▼aMetasurfaces
■653 ▼aNonlinear devices
■653 ▼aLinear-time-invariant
■653 ▼aBeam formation
■690 ▼a0607
■690 ▼a0544
■71020▼aUniversity of California, San Diego▼bElectrical and Computer Engineering.
■7730 ▼tDissertations Abstracts International▼g86-01B.
■790 ▼a0033
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161294▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
