Banca de QUALIFICAÇÃO: MARINA DE OLIVEIRA ALENCAR

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : MARINA DE OLIVEIRA ALENCAR
DATE: 30/01/2023
LOCAL: Sessão por Videoconferência (fechada ao público).
TITLE:

FREQUENCY SELECTIVE BAND-PASS SURFACES WITH TWO METALLIZATION LAYERS AND MATRYOSHKA GEOMETRY .

KEY WORDS:

Frequency selective surface, matryoshka geometry, polarization stability, bandpass response, double layer metallization. 

PAGES: 52
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUMMARY:

With the growth of wireless communication networks and the new demands on telecommunications systems, frequency selective surfaces, FSS, have been attracting the attention of several research groups for various applications, such as unmanned aerial vehicles, vehicular radar, radio navigation systems, digital TV, Internet-based services, terrestrial links, among others. When used in these applications, FSS can have either bandpass or band-reject frequency response. In this thesis proposal, the development of band-pass FSS with two layers of metallization and matryoshka geometry is presented, preserving characteristics such as miniaturization, multiband operation and the stability of polarization and incident angle. Unlike cascaded FSSs, the proposed FSS uses only one substrate layer, with the matryoshka geometry being used on one of its faces and a spiral on the other. The use of only one layer of substrate reduces the volume, as well as facilitates the fabrication process, since it avoids the use of spacers. On the other hand, the coil allows adjustment of the frequency response.  Obtaining the matryoshka geometry is described step by step, and equations that provide the initial values of its resonance frequencies are also proposed. Two FSS were designed and numerically characterized, one being just the matryoshka and the other the junction of the matryoshka with the square spiral, the application being chosen for C-band. The numerical results considered the x and y polarizations, with incidence angles ranging from 0° to 50°. The proposed initial design equations presented adequate results and good agreement was observed between the numerical results, confirming the expected frequency response, with polarization and incidence angle stability. 

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Externo ao Programa - 3213844 - DOUGLAS CONTENTE PIMENTEL BARBOSA - nullInterno - 2733127 - LAURO RODRIGO GOMES DA SILVA LOURENCO NOVO
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