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Banca de QUALIFICAÇÃO: RAFAEL VINICIUS TAYETTE DA NOBREGA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : RAFAEL VINICIUS TAYETTE DA NOBREGA
DATA : 28/07/2022
HORA: 14:00
LOCAL: https://conferenciaweb.rnp.br/webconf/murilo-13
TÍTULO:

Design and Performance Evaluation of RTD-based Oscillators for Wireless THz Communications.


PÁGINAS: 121
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
RESUMO:

The sixth generation (6G) mobile system will provide new markets, services and industries, enabling a multitude of new opportunities and solutions. 6G will benefit from emerging and disruptive technologies, as well as terahertz (THz) communication. The THz band (0.1-10 THz) is receiving substantial attention due to its huge unallocated spectrum, enabling large bandwidth, and high-capacity applications. Additionally, 6G will require solutions that can satisfy stringent power budgets. Therefore, a lot of effort is being devoted
to the development of innovative and effi cient devices to deal with such requirements. Fortunately, all these conditions can be met by one of the most prominent electronic devices, the resonant tunneling diode (RTD). RTD-based oscillators demonstrate notable
attributes such as high-speed switching, THz operating frequency, large bandwidth, low power consumption, room temperature operation, and ease of integration with conventional electronics. However, their output powers are still relatively small. Thus, studies looking for alternatives to increase its output power are under development yet. In this context, this work presents the design and performance evaluation of oscillators based on RTDs for THz wireless communication. First, the fundamental concepts of the voltage-controlled oscillator (VCO) based on RTD are presented, as well as its main figures of merit. Subsequently, a methodology for designing VCO-RTDs is developed. Next, an extended model is proposed to obtain the atmospheric absorption loss in the THz channel, for the range from 100 to 550 GHz. Therefore, the first transmitter based on VCO-RTD was simulated. Results show that the transmitter operating at 1.03 THz, achieved an output power of 39 μW, 0.18 Tb/s channel capacity and a range of 1.55 m. Then, transmitters made up of two RTDs in parallel are developed. The devices operated in the Y-band (325-500 GHz), and the 338 GHz transmitter supports 1.09 mW of output power, 0.107 Tb/s of channel capacity, and a wireless link range of 45.5 meters. Thus, it is verified that the proposed transmitters are suitable for THz microscale applications. Finally, it is introduced, for the first time, a GaAs/AlAs Nano-RTD functioning as a VCO. A formalism was derived to characterize and evaluate the performance of the nanodevice. The results showed the Nano-RTD operating in the H (220-325 GHz) and Y bands, with ultra-low consumption (160 nW), application-compatible output powers (3.56 nW), a channel capacity of 0.11 Tb/s for a maximum reach of 25 mm. In this way, the proposed nanodevice can be used for a multitude of THz nanoscale applications, in the healthcare field, including detection, monitoring and medical diagnosis.



MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1761105 - MURILO BELLEZONI LOIOLA
Membro Titular - Examinador(a) Interno ao Programa - 1762419 - CARLOS EDUARDO CAPOVILLA
Membro Titular - Examinador(a) Interno ao Programa - 2334927 - ANDRE KAZUO TAKAHATA
Membro Suplente - Examinador(a) Interno ao Programa - 1761107 - RICARDO SUYAMA
Notícia cadastrada em: 07/07/2022 13:53
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