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Sobre
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Sobre

Sou investigador sénior no Centro de Telecomunicações e Multimédia do INESC TEC, e coordenador da área de tecnologia ótica e eletrónica. Concluí a licenciatura em 2006 e o doutoramento em 2011, ambos em Engenharia Electrotécnica e de Computadores, pela Faculdade de Engenharia da Universidade do Porto. Atualmente sou responsável pela conceção e gestão de projetos de I&D, orientação de alunos de mestrado/doutoramento e bolseiros de investigação, e por promover a valorização de resultados de investigação através de novos contratos com a indústria. Estive envolvido como professor assistente convidado da Universidade do Porto nas disciplinas de engenharia de rádio e microondas e comunicações óticas. Sou autor/co-autor de mais de 50 publicações em conferências e revistas internacionais com revisão por pares, e de uma patente europeia. Já coordenei vários projetos de investigação e participei em vários projetos europeus. Os meus principais interesses de investigação incluem sistemas óticos coerentes, rádio-sobre-fibra, dispositivos rádio/microondas e antennas, transferência de energia sem fios e comunicações subaquáticas.

Tópicos
de interesse
Detalhes

Detalhes

019
Publicações

2022

Proof of Concept of a Low-Cost Beam-Steering Hybrid Reflectarray that Mixes Microstrip and Lens Elements Using Passive Demonstrators

Autores
Luo, Q; Gao, S; Hu, W; Liu, W; Pessoa, LM; Sobhy, M; Sun, YC;

Publicação
IEEE COMMUNICATIONS MAGAZINE

Abstract
In this article, a proof-of-concept study on the use of a hybrid design technique to reduce the number of phase shifters of a beam-scanning reflectarray (RA) is presented. An extended hemispherical lens antenna with feeds inspired by the retrodirective array is developed as a reflecting element, and the hybrid design technique mixes the lenses with the microstrip patch elements to realize a reflecting surface. Compared to the conventional designs that only use microstrip antennas to realize a reflecting surface, given a fixed aperture size the presented design uses 25 percent fewer array elements while shows comparable beam-steering performance. As a result of using fewer elements, the number of required phase shifters or other equivalent components such as RF switches and tunable materials is reduced by 25 percent, which leads to the reduction of the overall antenna system's complexity, cost, and power consumption. To verify the design concept, two passive prototypes with a center frequency at 12.5 GHz were designed and fabricated. The reflecting surface was fabricated by using standard PCB manufacturing and the lenses were fabricated using 3D printing. Good agreement between the simulation and measurement results is obtained. The presented design concept can be extended to the design of RAs operating at different frequency bands including millimetre-wave frequencies with similar radiation performances. The presented design method is not limited to the microstrip patch reflecting elements and can also be applied to the design of the hybrid RAs with different types of reflecting elements.

2021

Wide Scanning Angle Millimetre Wave 1 x 4 Planar Antenna Array on InP at 300 GHz

Autores
Hussain, B; Salgado, HM; Pessoa, LM;

Publicação
APPLIED SCIENCES-BASEL

Abstract
Featured Application Short-range millimetre wave communications. The design of a uniformly spaced 1 x 4 linear antenna array using epitaxial layers of benzocyclobutene over an InP substrate is demonstrated. The array elements are conjugately matched with a uni-travelling carrier photodiode at the input. The phased array is optimised to counteract mutual coupling effects by introducing metal strips with isolated ground planes for each radiating element. The proposed antenna array can provide a gain of 10 dBi with a gain variation of +/- 3 dB. The array operates over a bandwidth of 10 GHz (295-305 GHz) with a wide scanning angle of 100 degrees in the broadside.

2021

Design and Fabrication of sub-THz Steerable Photonic Transmitter 1x4 Array for Short-Distance Wireless Links

Autores
Guerrero, LG; Graham, C; George, J; Renaud, C; George, G; Hussain, B; Salgado, HM; Pessoa, LM; Hinojosa, A; Fernandez, J; Porcel, MAG;

Publicação
2021 JOINT EUROPEAN CONFERENCE ON NETWORKS AND COMMUNICATIONS & 6G SUMMIT (EUCNC/6G SUMMIT)

Abstract
In this paper we present the latest results on the design, fabrication and test of stand-alone photonic devices devoted to ultra-high bandwidth wireless access networks operating near the Terahertz (THz) band. We review the sub-THz photonics-based technology devices developed as part of the TERAPOD project, comprising the monolithically integrated Silicon Nitride photonic integrated circuit for phase distribution, the 1x4 array of integrated Uni-Travelling Carrier Photo-Diodes (UTC-PDs) and the radiative design of the high-frequency four element linear patch antenna array based on Benzocyclobutene (BCB) layers. We also report the suitability to assemble all those components in a robust small-form factor hybrid package.

2021

Evaluating a Novel Bluetooth 5.1 AoA Approach for Low-Cost Indoor Vehicle Tracking via Simulation

Autores
Paulino, N; Pessoa, LM; Branquinho, A; Goncalves, E;

Publicação
2021 JOINT EUROPEAN CONFERENCE ON NETWORKS AND COMMUNICATIONS & 6G SUMMIT (EUCNC/6G SUMMIT)

Abstract
The recent Bluetooth 5.1 specification introduced the use of Angle-of-Arrival (AoA) information which enables the design of novel low-cost indoor positioning systems. Existing approaches rely on multiple fixed gateways equipped with antenna arrays, in order to determine the location of an arbitrary number of simple mobile omni-directional emitters. In this paper, we instead present an approach where mobile receivers are equipped with antenna arrays, and the fixed infrastructure is composed of battery-powered beacons. We implement a simulator to evaluate the solution using a real-world data set of AoA measurements. We evaluated the solution as a function of the number of beacons, their transmission period, and algorithmic parameters of the position estimation. Sub-meter accuracy is achievable using 1 beacon per 15 m(2) and a beacon transmission period of 500 ms.

2021

Resonant cavity assisted broadband CPW to rectangular waveguide transition on InP at 300 GHz

Autores
Hussain, B; Wang, J; Al-Khalidi, A; Wasige, E; Salgado, HM; Pessoa, LM;

Publicação
2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)

Abstract
An in-plane resonant cavity-assisted coplanar waveguide (CPW) to rectangular waveguide (WG) transition is realized over an Indium Phosphide (InP) substrate with a thickness of 205 µm using a monopole radiating element. The simulated back-to-back (B2B) structure provides a bandwidth 16 GHz (288 - 304 GHz) with a return loss of 10 dB and insertion loss of 0.6 dB.

Teses
supervisionadas

2021

Next Generation Long-Haul Optical Fibre Communications and Optical-Wireless Interfaces

Autor
Joana dos Santos Tavares

Instituição
UP-FEUP

2021

Vehicle Tracking in Warehouses via Bluetooth Beacon Angle-of-Arrival

Autor
Telmo Francisco da Costa Soares

Instituição
UP-FEUP

2021

Residential Consumer Behavioural Analysis on the Participation in Demand Response Strategies

Autor
Kamalanathan Ganesan

Instituição
UP-FEUP

2021

Constellation shaping in high-speed optical fiber communications

Autor
Tiago Gonçalves Marques da Cunha

Instituição
UP-FEUP

2021

Single Sideband PAM-4 Optical Transmission: design and implementation

Autor
Sérgio Miguel Carvalho Gonçalves

Instituição
UP-FEUP