Banca de DEFESA: DANIEL CARVALHO DE SOUSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DANIEL CARVALHO DE SOUSA
DATE: 23/12/2022
TIME: 09:00
LOCAL: Virtual
TITLE:

Integration and Design of a Reconfigurable Refectarray antenna with a RF LoRa-based system for IoT multiprotocol applications

KEY WORDS:

Reconfigurable Refectarray antenna, RF LoRa-based system, IoT multiprotocol applications

PAGES: 72
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Telecomunicações
SPECIALTY: Sistemas deTelecomunicações
SUMMARY:

The present work consists of the development of an active reconfigurable Reflectarray(RA)
antenna. The active element used in the antenna is the PIN diode, which controls the phase distribution of the antenna. The radiating element is based on a flat rectangular microstrip structure.

This antenna was developed for satellite communications operating in the Ku band. Its versatility allows for digital beam-scanning, optimization and beamforming, through various techniques,
such as the convex optimization technique, which is applied for phase-optimization and sidelobe
minimization. This antenna can be used either in low-orbit satellites or base stations.

Due to this topology characteristics, the design of the efficient cell control circuit, and efficient
power supply are desirable. In this sense, a new approach to the control circuit is shown, which
was validated through a functional prototype.

Due to the possibility of transmitting data over long distances, through low-orbit satellites,
a system based on the LoRaWAN protocol was designed. This system aims to maximize the
communication range between two LoRa devices.

BANKING MEMBERS:
Externo à Instituição - BAYANMUNKH ENKHBAYAR
Interno - 3157968 - DANIEL COSTA ARAUJO
Presidente - 2193312 - SEBASTIEN ROLAND MARIE JOSEPH RONDINEAU