Fano-Assisted Tunable X-Band Microwave Ring Resonator

Autor(es)

Pepino, Vinicius M. ^{[1, 2]} ; da Mota, Achiles F. ^[3] ; Martins, Augusto ^[4] ; Martins, Emiliano R. ^[4] ; Borges, Ben-Hur V. ^[4] ; Teixeira, Fernando L. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Elect & Comp Engn, BR-13566590 Sao Paulo - Brazil

^[2] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 - USA

^[3] Univ Brasilia, Dept Elect Engn, BR-70910900 Brasilia, DF - Brazil

^[4] Univ Sao Paulo, Dept Elect & Comp Engn, Campus Sao Carlos, BR-13566590 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: IEEE Transactions on Microwave Theory and Techniques; v. 69, n. 4, p. 2155-2164, APR 2021.
• Citações Web of Science: 0

Resumo

Control of the resonance frequency of microwave cavities is of great interest in many applications such as sensing and wavelength filtering. However, this task normally relies on active control via functional materials (i.e., polymers and ferrites, or a combination of both) excited by an external electric or magnetic field. In this article, instead, we propose an innovative whispering gallery mode cavity resonator with tunable bandwidth for sensing and wavelength filtering applications. The proposed approach exploits Fano-type resonances (FTRs) to improve the cavity performance in the microwave regime. We have measured a similar to 74% increase in the loaded quality factor compared to regular ring cavities, with only 1.9-dB additional loss. In addition, by carefully choosing the size of the transmitting and receiving monopole antennas placed inside the cavity and their relative angular spacing, we can easily tune the cavity response. The extra degree-of-freedom introduced by such variable angular spacing, responsible for the onset of FTRs, allows the cavity quality factor Q to be continuously tuned from 385 to 670. (AU)

• Processo FAPESP: 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs