Pedro Pinho

Pedro Pinho
Instituto Politécnico de Lisboa | ISEL · GIEST - Grupo de Investigação em Electrónica e Sistemas de Telecomunicações

PhD

About

167
Publications
56,894
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1,477
Citations
Citations since 2017
60 Research Items
1123 Citations
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2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200

Publications

Publications (167)
Article
This letter presents a new passive sensor for temperature measurements based on a harmonic radio-frequency identification (RFID) tag that uses the temperature sensitivity of Schottky diodes as the main component for the generation of harmonics. The design of the harmonic sensor is based on the fact that the diode is a nonlinear device that when exc...
Data
A necessidade de criar sistemas inteligentes, que interajam com o meio envolvente, para estabelece relações simbióticas entre esses meios e tirando o maior partido de todas as suas potencialidades, tem demonstrado um claro perfil de crescimento. Neste contexto surgem os sistemas ciber-físicos, que têm como principal objetivo monitorizar o comportam...
Article
Full-text available
A necessidade de criar sistemas inteligentes, que interajam com o meio envolvente, para estabelece relações simbióticas entre esses meios e tirando o maior partido de todas as suas potencialidades, tem demonstrado um claro perfil de crescimento. Neste contexto surgem os sistemas ciber-físicos, que têm como principal objetivo monitorizar o comportam...
Article
Full-text available
The ability to remotely assess vital signs using radar systems may potentialize the healthcare systems, since it does not require any direct interaction with the subject. Nonetheless, these systems present inherent challenges that could compromise the accuracy of the vital signs parameters. For instance, there is a lack of resolution on the cardiac...
Article
Full-text available
This paper presents a holistic and authoritative review of the role of microwave technologies in enabling a new generation of wearable devices. A human-centric Internet of Things (IoT) covering remote healthcare, distributed sensing, and consumer electronics, calls for high-performance wearable devices integrated into clothing, which require interd...
Article
Full-text available
Radar systems have been widely explored as a monitoring tool able to assess the subject’s vital signs remotely. However, their implementation in real application scenarios is not straightforward. Received signals encompass parasitic reflections that occur in the monitoring environment. Generally, those parasitic components, often treated as a compl...
Article
Full-text available
The main goal of this paper is to present a three-dimensional (3D) antenna array to improve the performance of wireless power transmission (WPT) systems, as well as its characterization with over-the-air (OTA) multi-sine techniques. The 3D antenna consists of 15 antenna elements attached to an alternative 3D structure, allowing energy to be transmi...
Article
Unmanned Aerial Vehicles, also known as drones, are vehicles controlled remotely. First-Person View (FPV) technology allows these vehicles to have greater versatility and be more easily piloted. The antennas currently used for video transmission are bulky and uncomfortable, so there is a need for this volume to be reduced to increase portability, b...
Article
Full-text available
A bio-radar system is presented for vital signs acquisition, using textile antennas manufactured with a continuous substrate that integrates the ground plane. Textile antennas were selected to be used in the RF (Radio Frequency) front-end, rather than those made of conventional materials, to further integrate the system in a car seat cover and thus...
Article
Full-text available
Internet of Things (IoT) has been developing to become a free exchange of useful information between multiple real-world devices. Already spread all over the world in the most varied forms and applications, IoT devices need to overcome a series of challenges to respond to the new requirements and demands. The main focus of this manuscript is to est...
Article
Full-text available
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 b...
Article
Full-text available
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...
Article
Full-text available
Non-contact vital signs monitoring has a wide range of applications, such as in safe drive and in healthcare. In mental health care, the use of non-invasive signs holds a great potential, as it would likely enhancethe patient’s adherence to the use of objective measures to assess their emotional experiences, henceallowing for more individualized an...
Article
Full-text available
Cardiopulmonary activity measured through contactless means is a hot topic within the research community. The Doppler radar is an approach often used to acquire vital signs in real time and to further estimate their rates, in a remote way and without requiring direct contact with subjects. Many solutions have been proposed in the literature, using...
Article
In this paper a packaged compact meander-line monopole antenna for Bluetooth communications, manufactured in Low-Density Fan-Out technology, is presented. A combined size for the antenna and ground-plane of 0.10 $\lambda_0$ × 0.06 $\lambda_0$ × 0.008 $\lambda_0$ is obtained. Such small antennas are usually designed considering their connection t...
Article
Full-text available
This paper describes the influence of the laminating technique, typically used to produce printed textile antennas, on the return loss parameter (S 11) of the produced antennas. The sheet resistance (R s) of the conductive fabrics stand-alone was measured considering the use of steam, applying different adhesive sheets and taking into account the s...
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This paper describes the influence of the laminating technique, typically used to produce printed textile antennas, on the return loss parameter (S 11) of the produced antennas. The sheet resistance (R s) of the conductive fabrics stand-alone was measured considering the use of steam, applying different adhesive sheets and taking into account the s...
Article
This paper proposes a selective, tracking, and power adaptive far-field wireless power transfer (WPT) system that may be integrated into passive wireless sensor networks (PWSNs). Both transmitter and receiving nodes are developed with features that allow them to cooperate. The system operates based on a backscattered pilot signal, which is used to...
Article
Full-text available
The bio-radar system can measure vital signals accurately, by using the Doppler effect principle, which relates the received signal properties to the distance change between the radar antennas and the subject chest-wall. These systems have countless applications, from short range detection to assist in rescue missions, to long-term applications as...
Article
Full-text available
This paper presents and analyzes a low profile planar antenna array of elliptical elements with inner counter-elliptical slots. The antenna has single feed and provides two main directive radiation components (front and back), with gain higher than 7 dBi and circular polarization (CP) over the entire 5 GHz ISM & UNII bands. This approach also cance...
Article
Knowledge of the electromagnetic properties of textile materials is crucial in order to design wearable antennas. Despite the growth of research studies on textile antennas, the accurate characterization of the dielectric properties of the materials is still a challenge due to the intrinsic inhomogeneity and deformability of textiles. In this work,...
Article
Cardiopulmonary monitoring without any physical contact with the human body has several applications, such as health monitoring of bedridden patients, monitoring sleeping, or even for rescuing people from collapsed buildings. The Bio-Radar system can accurately measure vital signals by using the principle of the Doppler effect, which relates the pr...
Conference Paper
Full-text available
In the past several decades, the Finite-Difference Time-Domain (FDTD) method has become one of the most powerful numerical techniques in solving the Maxwell’s curl equations and has been widely applied to solve complex optical and photonic problems. This method divides space and time into a regular grid and simulates the time evolution of Maxwell’s...
Chapter
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In recent decades, we have witnessed a great progress in wireless communications. The huge amount of data that users expect to access has required an effort to increase the capacity of wireless networks. The main limitation of these communication systems is the increasing interference between channels and multipath fading. Smart antennas technology...
Article
This article presents recent European-based contributions for wireless power transmission (WPT), related to applications ranging from future Internet of Things (IoT) and fifth-generation (5G) systems to highpower electric vehicle charging. The contributors are all members of a European consortium on WPT, COST Action IC1301 (Table 1). WPT is the dri...
Conference Paper
Nowadays 3D printers are useful for the development and rapid prototyping of dielectric structures for radiation manipulation and support of antennas. This is possible since the materials used in this machines are essentially dielectric. These can be used as radiating elements (dielectric resonators), as radiation handlers (lenses) or as a supporti...
Article
In this study the authors present a possible solution for a compact printed folded dipole antenna, designed to match an nRF51822 Bluetooth Smart device. The use of a differential design avoids the need for a balun and the matching network between the IC and the antenna, therefore, reducing the power loss in these components. The performance of the...
Article
Full-text available
Vehicular communications have been subject to a great development in recent years, with multiple applications, such as electronic payments, improving the convenience and comfort of drivers. Its communication network is supported by dedicated short range communications (DSRC), a system composed of onboard units (OBU) and roadside units (RSU). A rece...
Article
In the current contest of wireless systems, the last frontier remains the cut of the power cord. In that sense, the interest over wireless energy transfer technologies in the past years has grown exponentially. However, there are still many challenges to be overcome in order to enable wireless energy transfer full potential. One of the focus in the...
Conference Paper
A compact design of balanced antenna operates in the LTE bands of 700/2600MHz is presented. The present antenna is a type of zigzag printed shapes. These zigzag strips were printed over RF4 substrate permittivity of 4.4 and full dimensions of 50 × 11 × 0.8 mm 3 . The results were simulated, and the performance showed that the zigzag approach was ab...
Article
Full-text available
The Internet of Things (IoT) scenario is strongly related with the advance of the development of wireless sensor networks (WSN) and radio frequency identification (RFID) systems. Additionally, in the WSN context, for a continuous feed, the integration of textile antennas for energy harvesting into smart clothing is a particularly interesting soluti...
Conference Paper
Over the last few years we have seen the progress of vehicular communications, as a way of development of the entire highway infrastructure, offering a set of new applications and functionalities to the users. The electronic collection for parking, tolls, gas stations, are some outcome of this technological development. This paper presents an anten...
Conference Paper
We present a SDR-based RFID reader design possessing two features that allow to improve the wireless power transfer capability and thereby extend the reading range of passive transponders: 1) The reader generates optimized non-CW powering waveforms that improve the RF-DC conversion efficiency of passive transponders. The sensitivity of an RFID chip...
Conference Paper
In the context of Wireless Body Sensor Networks for healthcare and pervasive applications, textile antennas allow an ubiquitous monitoring, communication, energy harvesting and storage. This paper presents a smart coat with a dual-band textile antenna for Radio Frequency (RF) energy harvesting, operating at GSM 900 and DSC 1800 bands, which is full...
Article
In this work, a high-efficiency radio-frequency energy-harvesting system that takes use of the Portuguese Digital Television signal (750–758 MHz) to obtain DC power is proposed. To be useful, it is optimized to operate at low-power conditions. For the rectifier, three different solutions are presented: a single-series diode, a single-shunt diode, a...
Article
The knowledge of the dielectric properties of materials, for the design of several components and circuits at high frequencies, is mandatory. In this paper, we present a simple method for the estimation of the dissipation factor (loss tangent) of dielectric materials based on the reflection measurement of a single microstrip line, which is applied...
Article
Full-text available
This paper presents the design of low-cost, conformal UHF antennas and RFID tags on two types of cork substrates: 1) natural cork and 2) agglomerate cork. Such RFID tags find an application in wine bottle and barrel identification, and in addition, they are suitable for numerous antenna-based sensing applications. This paper includes the high-frequ...
Conference Paper
Full-text available
In the context of Wireless Body Sensor Networks (WBSN) for healthcare and pervasive applications, the wearable antennas offer the possibility of ubiquitous monitoring, communication, energy harvesting and storage. Textile antennas are the link for a non-invasive integration of communication equipment and sensors, boosting the garment as an interfac...
Conference Paper
The substrate integrated waveguide (SIW) is an emergent technology that allows the fabrication of millimeter and microwave components and subsystems with the advantages of conventional metal waveguides, but being lighter and of easy integration of planar components and circuits . SIW is normally produced by creating rows of metallized holes using c...
Conference Paper
Collect energy from the surroundings is being biased to power-up devices in order to turn them self-sustainable. On the other hand, the spectrum resultant from the telecommunications tends to progressively increase and becomes wide-reaching, constituting an enormous opportunity to energy harvesting. This work aims to contribute with useful trends i...
Article
Wireless networks have joined to the sports venues, offering to the public a set of facilities, such as the access to email, news, and also to use the social networking, uploading their photos. New challenges have emerged to provide Wi‐Fi in this densely populated stadiums, such as increasing capacity and coverage. In this article, an access point...
Article
An adaptive antenna array combines the signal of each element, using some constraints to produce the radiation pattern of the antenna, while maximizing the performance of the system. Direction of arrival (DOA) algorithms are applied to determine the directions of impinging signals, whereas beamforming techniques are employed to determine the approp...
Conference Paper
The growing needs of higher transmission rates lead to the use of the Ka frequency bands and multi-beam technology, in the satellite communications, allowing more coverage. This fact leads to the need for the use of directive antennas and beamforming techniques to achieve a precise control of radiation pattern. This paper presents the design of a c...
Conference Paper
Discone antennas are wide bandwidth and omnidirectional radiation antennas that are widely used in VHF and UHF broadcasting systems. This paper presents the design and implementation of a discone antenna, for indoor use in a digital TV receiving/transmitting system, which was developed using 3D printing technology, allowing the development to be si...
Conference Paper
In this paper a rectangular patch antenna with two slots, integrated with a stacked parasitic antenna, is presented. These techniques allow a bandwidth (BW) and gain enhancement, two of the major limitations of traditional patch antennas. The antenna is designed to operate at 754 MHz for energy harvesting applications, from the Portuguese Digital T...
Conference Paper
Full-text available
This work introduces a novel concept of Wireless Power Transmission (WPT) for indoor environments and applications. In the proposed system, WPT is combined with a passive, localization system the aim of which is to localize devices to be charged and activate the WPT radiators only in the areas of interest. This allows for the efficiently empowering...