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Publicações

Publicações por Henrique Salgado

2019

Monte Carlo Radiative Transfer Modeling of Underwater Channel

Autores
M.G. Kraemer, R; M. Pessoa, L; M. Salgado, H;

Publicação
Wireless Mesh Networks - Security, Architectures and Protocols [Working Title]

Abstract

2019

Scalable High-Gaussicity Split-Block Diagonal Horn Antenna for Integration with Sub-THz Devices

Autores
Santos, HM; Lima, ED; Pinho, P; Pessoa, LM; Moro Melgar, D; Salgado, HM;

Publicação
2019 49TH EUROPEAN MICROWAVE CONFERENCE (EUMC)

Abstract
In this paper we propose a high-gaussicity spline-profiled horn antenna, which is scalable in length and aperture to achieve higher gains whilst retaining a high Gaussian efficiency. A novel approach is used where a PSO is used for optimizing the spline, using the gaussicities at the operating frequencies as the objective function, which further improves side-lobe level and cross-polarization when compared to the state-of-the-art. With the proposed method, which was validated through FEM simulations in HFSS, reflection coefficients below -15 dB, gains greater than 25 dBi and gaussicities above 91% were obtained in the entire WR-3 band.

2020

Patch Antenna-in-Package for 5G Communications with Dual Polarization and High Isolation

Autores
Santos, H; Pinho, P; Salgado, H;

Publicação
ELECTRONICS

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

Design of an Anechoic Chamber for W-Band and mmWave

Autores
Pinho, P; Santos, H; Salgado, H;

Publicação
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

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

Publicação
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.

2020

5.36 Gbit/s OFDM optical wireless communication link over the underwater channel

Autores
Araujo, JH; Kraemer, R; Tavares, JS; Pereira, F; Salgado, HM; Pessoa, LM;

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

Abstract
An OFDM transmission system is reported based on a directly modulated blue LASER diode, for high bit rate under-water optical communication applications. The 256 subcarriers 16-QAM signal is transmitted over a total distance of 2.4 m underwater with an EVM lower than -28.5 dB for a 250 MHz bandwidth and -16.5 dB for a 2 GHz bandwidth, the BER being lower than the forward error corrector limit. At the maximum bandwidth of 2 GHz a transmission rate of 5.36 Gbit/s is achieved. © 2020 IEEE.

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