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About

About

I am a senior researcher at the Centre of Telecommunications and Multimedia of INESC TEC, where I am also the coordinator of the area of Optical and Electronic Technologies. I received the “Licenciatura” degree in 2006 and PhD degree in 2011, both in Electrical and Computer Engineering from the Faculty of Engineering of the University of Porto. Currently I am responsible for the conception and management of R&D projects, coordination of research students and fostering the valorization of research results through new contracts with industry. I was previously involved in teaching of RF/microwave engineering and optical communications as an invited assistant professor at the University of Porto. I am author/co-author of more than 50 publications in international conferences and journals with peer-review, and 1 european patent. I have coordinated several research projects and participated in several EU research projects. My main research interests include coherent optical systems, radio-over-fibre, RF/microwave devices and antennas, and underwater wireless power/communications.

Interest
Topics
Details

Details

016
Publications

2019

Resonant tunneling diode photodetectors for optical communications

Authors
Watson, S; Zhang, WK; Tavares, J; Figueiredo, J; Cantu, H; Wang, J; Wasige, E; Salgado, H; Pessoa, L; Kelly, A;

Publication
Microwave and Optical Technology Letters

Abstract
Optical modulation characteristics of resonant tunneling diode photodetectors (RTD-PD) are investigated. Intensity modulated light excites the RTD-PDs to conduct data experiments. Simple and complex data patterns are used with results showing data rates up to 80 and 200 Mbit/s, respectively. This is the first demonstration of complex modulation using resonant tunneling diodes. © 2019 The Authors. Microwave and Optical Technology Letters published by Wiley Periodicals, Inc.

2019

Optical direct intensity modulation of a 79GHz resonant tunneling diode-photodetector oscillator

Authors
Zhang, WK; Watson, S; Figueiredo, J; Wang, J; Cantu, HI; Tavares, J; Pessoa, L; Al Khalidi, A; Salgado, H; Wasige, E; Kelly, AE;

Publication
Optics Express

Abstract

2018

Evaluation of SAR induced by a planar inverted-F antenna based on a realistic human model

Authors
Vieira, VF; Pessoa, LM; Carvalho, MI;

Publication
IFMBE Proceedings

Abstract
In this paper the absorption by the human body of electromagnetic (EM) radiation generated by a Planar Inverted-F Antenna (PIFA) from a modern mobile phone is investigated through the evaluation of the Specific Absorption Rate (SAR) in head, brain and hand regions using Sim4Life (S4L) and a realistic anatomical model. Several scenarios were evaluated, by varying the distance between the antenna and the head, the feeder position and the orientation of the antenna. The effect of the presence of the hand was also studied and, finally, different communication bands were considered. The main results show that the presence of the hand is determinant to reduce SAR on head and brain, while bottom orientations of the antenna reduce the SAR on the brain, but increase the SAR in other tissues. © Springer Nature Singapore Pte Ltd. 2018.

2018

Experimental Evaluation of Resonant Tunnelling Diode Oscillators Employing Advanced Modulation Formats

Authors
Tavares, JS; Pessoa, LM; Salgado, HM;

Publication
International Conference on Transparent Optical Networks

Abstract
The performance of Resonant Tunnelling Diode (RTD) oscillators with an optical window is evaluated experimentally, in the transmission of advanced modulation formats using electrical and optical modulation, for the first time. Additionally, the impact of phase noise in the transmission performance is also assessed. © 2018 IEEE.

2018

Elliptical Monopole Antenna on InP Substrate for Sub-THz RTD-based Oscillators

Authors
Santos, HM; Pessoa, LM; Salgado, HM; Pinho, P;

Publication
2018 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING

Abstract
The high permittivity of InP substrates has been a limiting factor for the bandwidth and efficiency of antennas fabricated in this material. In this manuscript we propose an elliptical monopole, monolithically fabricated in InP, fed by a CPW line. The suggested topology was simulated using HFSS finite element method. Input reflection coefficient measurements were performed on the monopole to validate the proposed antenna. Simulated and measured -10 dB bandwidths of 27 and 24 GHz were obtained, respectively. The peak simulated efficiency and realized gain were 95.37% and 4.6 dBi.

Supervised
thesis

2017

Implementação em FPGA de um conversor HDMI para transmissão em série de alta velocidade

Author
Ana Marisa Oliveira Barbosa

Institution
UP-FEUP

2017

Effect of electromagnetic fields induced by mobile devices in the human brain

Author
Vânia Filomena Madureira Vieira

Institution
UP-FEUP

2017

Performance assessement of the DLPA in Radio Frequency Identification

Author
Erick Delgado Lima

Institution
UP-FEUP

2016

Software Defined Radar for Medical Imaging

Author
Wilson José dos Santos Silva

Institution
UP-FEUP

2016

Therapeutic Applications of Electromagnetic Radiation

Author
Joana da Silva Gomes

Institution
UP-FEUP