Prof. Custodio Peixeiro

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Academic Career Length

39Years (1988-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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6 October 2017 in IEEE Antennas and Wireless Propagation Letters

Journal Article

A Dual-Mode Single-Band Wearable Microstrip Antenna for Body Area Networks

Carlos Mendes

Custodio Peixeiro

Design, fabrication, and test of a novel single-band wearable antenna with dual-mode operation (on-body and off-body) for body area network's applications in the 2.45 GHz industrial scientific and medical band are presented. The on-body mode is achieved with a microstrip ring while the off-body mode is obtained with a compact meandered microstrip patch placed inside the ring. The two antennas are fed separately but share a common ground plane and use only fabric materials facilitating the integration into the user's clothes. The antenna operation is characterized when placed on a phantom mimicking a human torso. Input match, mutual coupling, radiation pattern, radiation efficiency, and path loss measurements are presented and show good agreement with simulations.

1 January 2002 in IEEE Antennas and Wireless Propagation Letters

Journal Article

Miniaturization of rectangular microstrip patches using genetic algorithms

N. Herscovici

M.F. Osorio

Custodio Peixeiro

This paper presents a new procedure for the miniaturization of rectangular microstrip patches based on genetic algorithms. The shape of a typical rectangular patch is modified in order to reduce its resonance frequency keeping the physical volume of the antenna constant. As an example, the resonance frequency of a square microstrip patch is reduced from 3 to 1.8 GHz. The patch is divided in 9/spl times/9 square cells. The genetic algorithm optimization procedure is subsequently used to remove some of the metallic cells. To validate the procedure an antenna prototype has been fabricated and tested. Good agreement is obtained between theoretical and experimental results.

1 January 2004 in IEEE Antennas and Wireless Propagation Letters

Journal Article

Microstrip fractal antennas for multistandard terminals

Jerzy Guterman

Antonio A. Moreira

Custodio Peixeiro

A novel microstrip patch antenna with a Koch prefractal edge and a U-shaped slot is proposed for multi-standard use in GSM1800, UMTS, and HiperLAN2. Making use of an inverted-F antenna (PIFA) structure, an interesting size reduction is achieved. The multi-band behavior has been obtained by broadening the lower frequency resonance of the fractal patch to cover GSM1800 and UMTS, and inserting a U-slot dimensioned for the HiperLAN2 band. The effect of the small ground plane has been taken into account. Experimental results have validated the design procedure and confirm the fulfillment of the requirements for multistandard mobile terminal applications.

29 June 2018 in IEEE Transactions on Antennas and Propagation

Journal Article

On-Body Transmission Performance of a Novel Dual-Mode Wearable Microstrip Antenna

Carlos Mendes

Custodio Peixeiro

The path loss established between several wearable antennas placed on a tissue-equivalent phantom is investigated through numerical simulations and measurements. The on-body performance of a previously proposed dual-mode wearable textile antenna, designed to operate in the 2.45 GHz industrial, scientific and medical band, is evaluated and compared with a wearable textile patch antenna. Simulation results of a λ/4 resonant wire monopole are also presented to serve as a reference. Five different scenarios for the location of the transmitting and receiving antennas are analyzed: one with line of sight (LOS), two with nonLOS (NLOS), and the remaining two in the transition between LOS and NLOS. The transmission results are evaluated with the antennas mounted on the surface of a homogeneous phantom with 2/3 muscle properties mimicking the shape and physical macroscopic properties of a human torso. A general good agreement is obtained between numerical simulation and experimental results. It is shown that in the NLOS scenario, the proposed antenna has an equivalent path loss only about 3.4 dB higher than the monopole and about 10 dB lower than the patch.

8 February 2016 in IEEE Transactions on Terahertz Science and Technology

Journal Article

Tri-Band, Polarization-Independent Reflectarray at Terahertz Frequencies: Design, Fabrication, and Measurement

Hamed Hasani

Michele Tamagnone

Santiago Capdevila

Clara F. Moldovan

Pietro Maoddi

Julien Perruisseau-Carrier

In this paper, two THz reflectarray surfaces have been designed and fabricated in order to deflect a plane wave with any polarization and with a specific incident angle to three different specific directions each at distinct three frequencies of 0.7, 1.0 and 1.5 THz. The surface is composed of an array of 100 ×100 cells, each comprised of gold crosses and parasitic dipoles printed on thin grounded high resistivity silicon. Finite-element method (FEM) simulations are in line with the measurement results obtained using THz time-domain spectroscopy (THz TDS) showing the intended deflections for the two fabricated samples each with an arbitrary frequency-vs-deflection angle relationship. In addition, the use of silicon as the substrate paves the way for the integration of reconfigurable technologies which enhances the reflectarray versatility.

28 March 2022 in IEEE Transactions on Antennas and Propagation

Journal Article

Single-Layer Dual-Band Dual-Circularly Polarized Reflectarray for Space Communication

Roger L. Farias

Custodio Peixeiro

Marcos V. T. Heckler

This communication proposes a novel unit cell for the design of dual-band dual-circularly polarized reflectarrays for space communications. The main advantage of the proposed cell is the use of one single layer for the antenna fabrication, hence yielding lower costs and fabrication with lower complexity in comparison to multilayer antennas. The proposed cell is used to design a dual-band dual-circularly polarized reflectarray with widely separated bands. Due to the physical symmetry, it provides very good polarization characteristics. The antenna performance is validated by far-field measurements and very good agreement between simulated and measured results has been verified.

About Me

Custódio Peixeiro received the PhD degree in Electrical and Computer Engineering from Instituto Superior Técnico (IST), University of Lisbon (UL), in 1993. He has been a research member of Instituto de Telecomunicações (IT) since 1994. He retired in October 2023 from his role as an assistant professor at the Department of Electrical and Computer Engineering (DEEC), IST-UL (1993–2023). He maintains pro bono voluntary institutional collaboration with IST-UL and IT. In the faculty of the DEEC-IST-UL (1980–2023), he taught seventeen courses in the antenna and propagation field, namely, “Propagation and Radiation of Electromagnetic Waves” (with an average of 270 students per year) in the last ten years. He has participated actively in many European research projects and networks of excellence (MBS, FLOWS, ACE, NEWCOM, EARTH), in educational projects (ALFA, TEMPUS), and in national research projects. He was actively involved as a Portuguese national delegate in several EU antenna COST actions. He has also authored, or coauthored, eight book chapters, thirty-six journal papers, and one hundred and thirty-one conference papers. His research interests include the analysis, design, fabrication, and test of printed antennas and circuits. He has been an IEEE life member since 2023.

Prof. Custodio Peixeiro

Prof. Custodio Peixeiro

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