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About

Henrique M. Salgado graduated in Applied Physics (Optics and Electronics) from the University of Porto in 1985 and received the PhD degree in Electronic Engineering and Computer Systems from University of Wales in 1993. He joined the Department of Electrical Engineering and Computers of the University of Porto in 1999 as an Invited Assistant Professor and in 2003 he became Associate Professor. Since 1995 that he heads the Optical and Electronics Area of INESC TEC, begin responsible for several national and internationally funded (EU) research projects. From 1997-1999 he was Research Fellow at the Department of Electrical and Electronic Engineering of the University College London, UK and previously Research Assistant at the School of Electronic Engineering and Computer Systems, Bangor, UK. He is the author and co-author of numerous international publications in the field of optical fibre communications and microwaves. His current research interests include: radio-over-fiber technology and microwave photonics, digital equalization in coherent optical systems, all-optical networks, modeling of nonlinearities and design of compact multiband antennas. He is a member of the Photonics and Communications societies of the IEEE.

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Details

Details

023
Publications

2021

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

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

Publication
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

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

Publication
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.

2020

Patch antenna-in-package for 5G communications with dual polarization and high isolation

Authors
Santos, H; Pinho, P; Salgado, H;

Publication
Electronics (Switzerland)

Abstract
In this paper, we describe the design of a dual polarized packaged patch antenna for 5G communications with improved isolation and bandwidth for K-band. We introduce a differential feeding technique and a heuristic-based design of a matching network applied to a single layer patch antenna with parasitic elements. This approach resulted in broader bandwidth, reduced layer count, improved isolation and radiation pattern stability. The results were validated through finite element method (FEM) and method of moments (MoM) simulations. A peak gain of 5 dBi, isolation above 40 dB and a radiation efficiency of 60% were obtained. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

2020

Design of an Anechoic Chamber for W-Band and mmWave

Authors
Pinho, P; Santos, H; Salgado, H;

Publication
ELECTRONICS

Abstract
In this paper, we describe the design of an electrically large anechoic chamber for usage on millimetre-wave bands. Ansys Savant sotware was used to perform a simulation of the chamber, using physical optics coupled with uniform theory of diffraction (PO/UTD). Moreover, a method based on an open waveguide probe is described in this paper to obtain the electrical properties of the RF absorbers at millimetre-wave frequencies. Two different source antennas were simulated in this work and the corresponding quiet zones predicted. The largest quiet zone was 30 mm x 30 mm x 50mm, for a chamber size of 1.2 m x 0.6 m x 0.6 m.

2020

LASER diode-based transmitter module for optical wireless communications

Authors
Araujo, JH; Kraemer, R; Santos, HM; Pereira, F; Salgado, HM; Pessoa, LM;

Publication
2020 12th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2020

Abstract
In this paper, we present the design of an analog transmitter based on a blue LD targeting optical wireless communications, suitable for OFDM signals. The approach relies on a thorough characterization of the individual components of the module, whence a detailed circuit model is obtained to design an impedance matching circuit for improved performance, prior to fabrication. The impedance matching is based on non-uniform transmission lines and works well over a wide frequency range (100 MHz to 2 GHz). The results are experimentally validated by the transmitter response exhibiting an increased 6 dB bandwidth limit and 1 GHz bandwidth improvement. © 2020 IEEE.

Supervised
thesis

2021

FPGA like photonic processor chip for RF filtering

Author
Tiago Luís Moreira Azevedo de Sousa

Institution
UP-FEUP

2021

Constellation shaping in high-speed optical fiber communications

Author
Tiago Gonçalves Marques da Cunha

Institution
UP-FEUP

2021

Projecto de matriz de antenas para futura geração de comunicações móveis

Author
José Miguel Sousa Neves

Institution
UP-FEUP

2021

Antenna array design for future generation of mobile communications

Author
José Miguel Sousa Neves

Institution
UP-FEUP

2021

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

Author
Joana dos Santos Tavares

Institution
UP-FEUP