A5083052391- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Advanced Antenna and Metasurface Technologies
- Electromagnetic Compatibility and Measurements
- Energy Harvesting in Wireless Networks
- Microwave and Dielectric Measurement Techniques
- Antenna Design and Optimization
- Electromagnetic Compatibility and Noise Suppression
- RFID technology advancements
- Quantum optics and atomic interactions
- Millimeter-Wave Propagation and Modeling
- Power Line Communications and Noise
- Blind Source Separation Techniques
- Wireless Body Area Networks
- Photonic and Optical Devices
- Electromagnetic Simulation and Numerical Methods
- Speech and Audio Processing
- Electrostatic Discharge in Electronics
- Ultra-Wideband Communications Technology
- Electromagnetic Scattering and Analysis
- Radio Frequency Integrated Circuit Design
- Electromagnetic Fields and Biological Effects
- Acoustic Wave Resonator Technologies
- Bluetooth and Wireless Communication Technologies
- Quantum and electron transport phenomena
Universidade Federal de Campina Grande
2016-2025
University of Maryland Extension
2025
University of Mount Union
2023-2024
University of Rio Grande and Rio Grande Community College
2023
Universidade Federal Rural do Semi-Árido
2019-2023
Coordenação de Aperfeicoamento de Pessoal de Nível Superior
2023
Laboratoire de Conception et d'Intégration des Systèmes
2021
Institut polytechnique de Grenoble
2021
Tech Pro (China)
2021
Association for Women in Science
2021
A metamaterial-based microwave sensor with complementary split ring resonator (CSRR) is implemented for dielectric characterization of liquids. The novelty in the proposed contactless use liquid samples placed normal to surface. Placed inside glass capillary tubes, it quickly possible analyze properties liquids simply by replacing tubes new samples. modify resonant frequency and <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> -factor CSRR...
This paper develops an innovative design method of a multi-coupled line (CL) topology low-loss dual band negative group delay (NGD) circuit. The proposed is conceived using three transmission lines (TLs) with different length in which integrate two couplers. traveling paths are designed to generate the dual-band NGD effect, where CLs allow lowering signal attenuation. circuit S-parameter model as function TLs physical lengths and coupling coefficient established. To validate...
Abstract The authors introduce a novel low‐profile circular‐polarized three‐layer fractal antenna design to reduce beam divergence in orbital angular momentum (OAM) applications at microwave frequencies. top layer of the proposed has printed Koch that is coupled rotated rectangular patch mid‐layer fed through microstrip line. bottom consists metallic ground plane improve collimation. was developed from new geometry generated Scilab™. Characteristic mode theory used obtain two orthogonal...
Two methods for measuring the dielectric constant and loss tangent of materials using software‐defined radio (SDR) are presented, which may be used as an alternative to expensive vector network analysers (VNA). The first method was cylindrical cavity resonator designed a resonance frequency 2.5 GHz. second complementary split ring 1.25 In both cases, measurements were carried out VNA SDR compare efficiency tools. measurement accuracy assessed by comparing results with declared values in data...
This paper investigates on the theorization, design, fabrication and measurement of original phase shifter (PS) operating with two-step stair behavior. The innovative PS is designed unfamiliar stop-band (SB) negative group delay (NGD) passive circuit. elementary SB-NGD topology constituted by resistive, inductive, capacitive lumped network described. Acting as an RF microwave circuit, S-matrix model expressed in function RLC-network parameters. Thus, canonical form transfer (TF) represented...
This paper develops an original design method of high-pass (HP) negative group delay (NGD) integrated circuit (IC). The considered HP-NGD IC is based on a passive topology which essentially composed resistor-inductor (RL) network. presents the first time that unfamiliar HP-topology designed in miniaturized implemented 130-nm CMOS technology. theory voltage transfer function (VTF) analysis elaborated. equations with synthesis formulas resistor and inductor are established. methodology...
In this paper, we present the design, fabrication and calibration of a passive UHF RFID tag based soil moisture environment temperature sensor. The inter-digital double-sided capacitive sensor developed modifies its capacitance as changes, due to modification permittivity. implemented smart includes an external front-end that is capable process analog sensors send digitized measurements reader. order obtain reliable readings, was performed described. used chip also built-in presented 6.95...
This paper aims to develop an original circuit theory of inductorless NGD topology. The considered passive cell comprised resistor and capacitor elements without inductor operates as a bandpass (BP) function. specifications functions are defined. Generally, the BP fully lumped circuits available in literature operate with resonant RLC-network. In introduced research work, was first time identified exhibit behavior presence inductive component. topology is inspired from combination low-pass...
The unfamiliar negative group delay (NGD) circuit is the less familiar function for most of RF and microwave design engineers. Among existing types, bandpass (BP) NGD type circuits are convenient wireless communication technology. Therefore, it particularly important to explore different topologies operating as BP-NGD function. An innovative topology constituted by defected ground structure (DGS) with complementary split ring resonator (CSRR) developed in present paper. DGS-based method...
This work aims to classify the contamination state in insulators using statistical signal processing approaches. When subjected high voltage, can radiate radio frequency signals (corona effect). The histograms, normality, and correlation coefficient methods are used estimate pollution glass when 8 kV. It is shown that particular situations histograms be distinguish clean dirty insulators. histogram limitation analysis improved normality or Gaussianity test. Indeed, it these parameters into...
In this article, a millimeter-wave (mmWave) chipless radio-frequency identification (RFID) tag is developed to operate in the V-band for authentication applications. A novel approach based on backscattered E-field measurements at different orientation angles unitary classification proposed. The concept hardness identically reproduce materials due inherent randomness fabrication process. These uncertainties are transcribed very small variations that can be observed electromagnetic response....
In this article, a time-domain test on the negative group delay behavior of double-Li-structure microstrip circuit is proposed. The feasibility validated experimentally using Gaussian envelopes modulating sine carrier frequencies inside and outside frequency bands.
The growing interest in the Radio Frequency Identification (RFID) technology is giving rise to new applications, particular for identification of metallic objects. This has initiated development designs RFID tag antenna. paper presents a UHF miniaturized patch antenna aimed at this application. fed by balanced feed avoid cross-layered construction and matched with stub. Its miniaturization achieved inserting u-shaped slot radiating patch.
A new compact microwave amplifier structure using an iterative technique based on the wave concept procedure (WCIP) is presented. This multilayer composed of five planar interfaces strip lines. The used to model this provides a mixed resolution in modal and spatial domain. By taking best advantage each domain, lower computing time obtained. purpose paper demonstrate that near field amplification achievable WCIP suitable electromagnetic analysis kind structure. numerical results show 13.4 dB...
Near-field radiative Wireless Power Transfer (WPT) has the advantage of high-power WPT.In this paper, an alltextile WPT receiver is realized for first time, using embroidered coil and a printed tuning capacitor on textile substrate.The proposed demonstrated receiving over 3 W DC power at 6.78 MHz with 23% end-to-end efficiency.A low Specific Absorption Rate (SAR) 0.37 W/kg observed, through full-wave simulation, up to 10 highfrequency input on-body coil, demonstrating its suitability...
In this paper the characteristics radiation of overhead power lines glass insulators is investigated. Two feeding possibilities are used to analyze effects. The first point placed on cap insulator and second one connected pin. reflection coefficient (S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> ) for two covering band 30 MHz 1 GHz was measured. measurements were performed with different conservation states: has a metal frame in...
This paper proposes to use a statistical approach for classifying the contamination level of insulators used in high voltage transmission lines. studied case considers applied on glass chain six elements
This paper develops an original circuit theory of energy and data transition. The modelling signal hybrid receiver (SEHR) is developed. SEHR topology described in function the constituting coupled line (CL) a transmission (TL) performed with unfamiliar arbitrary load values. equivalent S-matrix versus electrical parameters established. analysis enables to predict transmitted power also optimal condition zero reflection terminal loads. validity analytical model verified commercial tool...
Purpose The purpose of this paper is to study, a bridged-T topology with inductorless passive network used as bandpass (BP) negative group delay (NGD) function. Design/methodology/approach BP NGD under study composed an resistive capacitive network. circuit analysis elaborated from the equivalent impedance matrix. Then, analytical model C-shunt voltage transfer function established. considered developed in parameters. properties and characterizations proposed are analytically expressed....
The folding antennas are anticipated to become mandatory because of integration necessity according communication object shapes.The effect folded on electromagnetic (EM) radiation is an open question for RF and microwave wireless engineers.An innovative approach explore the flexible patch antenna (FPA) parameters through V-folding analysis addressed this problem.This paper focused methodological FPA study by considering behavior compared classical flat condition.As a proof-of-concept,...
The principles and advantages of an integral iterative method based on a wave concept known as the procedure are outlined. spectral operators used in formulation expressed cylindrical coordinates so that they can be to solve problems involve cylinders. In first step, validity robustness verified by simulations classical structures second successfully compared measurements for coupled slot antennas perfectly conducting cylinder.
Three antennas for Wi-Fi 802.11n applications are presented. The first antenna is a dual-band operating at the 2.4 GHz and 5.5 bands. This conceived from zero-order resonating wire metamaterial antenna. By making judicious choice capacitances inductances of mode antenna, new metamaterial-inspired can resonate two distinct frequencies. simulated gain 2 dBi 4 lower upper band, respectively. others designed compact folded monopole with 0.5 gain, dipole gain. They were using CST Microwave Studio...