A5044433463- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Energy Harvesting in Wireless Networks
- Advanced Antenna and Metasurface Technologies
- Advanced Power Amplifier Design
- Radio Frequency Integrated Circuit Design
- Antenna Design and Optimization
- Wireless Body Area Networks
- Millimeter-Wave Propagation and Modeling
- Advanced MIMO Systems Optimization
- Bluetooth and Wireless Communication Technologies
- Wireless Power Transfer Systems
- Metamaterials and Metasurfaces Applications
- GaN-based semiconductor devices and materials
- Microwave and Dielectric Measurement Techniques
- Microwave Imaging and Scattering Analysis
- Ultra-Wideband Communications Technology
- Acoustic Wave Resonator Technologies
- Indoor and Outdoor Localization Technologies
- Electromagnetic Scattering and Analysis
- Advanced DC-DC Converters
- Power Line Communications and Noise
- Telecommunications and Broadcasting Technologies
- RFID technology advancements
- Wireless Communication Networks Research
Instituto de Telecomunicações
2015-2024
University of Bradford
2010-2024
Universidade de Vigo
2022
Weatherford College
2021
Centre Tecnologic de Telecomunicacions de Catalunya
2021
University of South Wales
2021
Iquadrat (Spain)
2021
National and Kapodistrian University of Athens
2021
Syracuse University
2021
Qatar University
2021
In this paper, we propose an eight-port/four-resonator slot antenna array with a dual-polarized function for multiple-input-multiple-output (MIMO) 5G mobile terminals. The design is composed of four square-ring radiators fed by pairs microstrip-line structures. radiation elements are designed to operate at 3.6 GHz and located on the corners smartphone PCB. provide good dual-polarization characteristic similar performances in terms fundamental characteristics. order improve isolation also...
A millimeter-wave (mm-Wave) multiple input output (MIMO) antenna operating at 24 GHz (ISM band), suitable for wearable applications, is proposed in this paper. The MIMO consists of two elements, designed with an edge-to-edge distance 5.14 mm, backed by a 5 × cell electromagnetic bandgap (EBG) structure. fabricated on flexible Rogers 6002 material (ϵ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> =$ 2.94, tanδ = 0.0012, thickness 0.254...
Human activity recognition (HAR) from sensor readings has proved to be an effective approach in pervasive computing for smart healthcare. Recent approaches ambient assisted living (AAL) within the home or community setting offers people prospect of independent care and improved quality living. However, most available AAL systems are limited by several factors including system complexity computational cost. In this paper, a simple, novel HAR framework using multivariate Gaussian is proposed....
In this paper a metamaterial-inspired T-matching network is directly imbedded inside the feedline of microstrip antenna to realize optimum power transfer between front-end an RF wireless transceiver and antenna. The proposed network, which composed arrangement series capacitor, shunt inductor, exhibits left-handed metamaterial characteristics. matching first theoretically modelled gain insight its limitations. It was then implemented in 50- Ω standard circular patch antenna, unconventional...
Multiple-input multiple-output (MIMO) antennas with four and eight elements having connected grounds are designed for ultra-wideband applications. Careful optimization of the lines connecting leads to reduced mutual coupling amongst radiating patches. The proposed antenna has a modified substrate geometry comprises circular arc-shaped conductive element on top ground plane geometry. Polarization diversity isolation achieved by replicating orthogonally forming plus shape structure. consists...
A dual-port transparent multiple-input multiple-output (MIMO) antenna resonating at sub-6 GHz 5G band is proposed by using patch/ground material as conductive oxide (AgHT-8) and a Plexiglas substrate. Two identical circular-shaped radiating elements fed microstrip feedline are designed the finite element method (FEM) based high-frequency structure simulator (HFSS) software. The effect of isolation mechanism discussed two cases. In case 1, horizontally positioned oriented in similar direction...
A compact, dual polarized, multiband four-port flexible Multiple Input Output (MIMO) antennae with the connected ground and high isolation is designed computation experimental measurement studies. All four monopole radiators are embedded decagon-shaped FR-4 substrate an outer radius of 10 mm in order to accomplish circularly polarized (CP) radiations, bandwidth enhancement, compact size only 45×38×0.2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A printed and minimal size antenna having the functionality of frequency shifting as well pattern reconfigurability is presented in this work. The proposed work consists three switches. Switch 1 a lumped switch that controls operating bands antenna. 2 3 beam switching When ON, operates at 3.1 GHz 6.8 GHz, covering 2.5–4.2 6.2–7.4 bands, respectively. OFF, only band. desired from can be obtained by adjusting ON OFF states Switches 3. Unique beams different combination gain greater than 3.7...
A compact four-element multiple-input multiple output (MIMO) antenna is proposed for medical applications operating at a 2.4 GHz ISM band. The MIMO design occupies an overall volume of 26 mm × 0.8 mm. This exhibits good impedance matching the frequency band, whose performance attributes include: isolation around 25 dB, envelope correlation coefficient (ECC) less than 0.02, average channel capacity loss (CCL) 0.3 bits/s/Hz and diversity gain (DG) 10 dB. peak realized dBi with more 77 %...
Interconnected three-element and four-element wideband MIMO antennas have been proposed for millimeter-wave 5G applications by performing numerical computations carrying out experimental measurements. The antenna structure is realized using Rogers 5880 substrate (εr = 2.2, tan δ 0.0009), where the radiating element has shape of an inverted L with a partial ground. unit carefully designed positioned (by orthogonally rotating elements) to form (case 1) 2) antennas. interconnected ground both...
In this article, a 2.45-GHz band microwave sensor (MWS) design is introduced to be utilized for the dielectric constant determination of ethanol–water solutions. The MWS composed two symmetrically positioned, directly coupled interconnected split-ring resonators with circular ring-shaped detection area in middle region, into which small amount solution dropped. fabricated prototype has total component size <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A low-profile (0.21 λ g × 0.35 0.02 ) and a simply-structured frequency-switchable antenna with eight frequency choices is presented in this paper. The radiating structure (monopole) printed on 1.6-mm thicker, commercially-available substrate of FR-4 ( ϵ r = 4.4, tan δ 0.020). Specifically, it uses three PIN diodes the designated places to shift resonant bands antenna. operates at four different modes depending ON OFF states diodes. While each mode, covers two unique frequencies (Mode 1 1.8...
A new and compact four-pole wide-band planar filter-antenna design is proposed in this article. The effect of the dielectric material type on characteristics also investigated presented. structure formed by a fourth-order band-pass filter (BPF) cascaded with monopole microstrip antenna. designed operates at centre frequency 2.4 GHz has relatively impedance bandwidth about 1.22 fractional (FBW) 50%. effects three different types substrate material, which are Rogers RT5880, RO3003, FR-4,...
The paper presents the general requirements and an exemplary design of RF front-end system that in today's handset is a key consumer power. required to minimize carbon footprint mobile handsets devices, whilst facilitating cooperation, providing energy-efficient operation multi-standards for 5G communications. It provides basis hardware solutions integration challenges offers features covering energy efficiency power amplifiers (PAs), Internet Things (IoT) controlled tunable filters compact...
In this paper, we present the design of a compact and highly sensitive microwave sensor based on metamaterial complementary split-ring resonator (CSRR), for liquid characterization at frequencies. The consists two-port microstrip-fed rectangular patch resonating structure printed 20 × 28 mm2 Roger RO3035 substrate with thickness 0.75 mm, relative permittivity 3.5, loss tangent 0.0015. A CSRR is etched ground plane purpose miniaturization. investigated sample put in capillary glass tube lying...
An efficient four-elements mmWave multiple-input multiple output (MIMO) antenna is proposed for use in 5G system The MIMO design operates at 35GHz and occupies an overall volume of 12.5 mm × 0.8 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> . This exhibits a good matching impedance the operating frequency band, where isolation greater than 25 dB, envelope correlation coefficient (ECC) less 0.02, diversity gain (DG) around 10dB are...
An approach is presented to enhance the isolation of a two-port Multiple Input Output (MIMO) antenna using decoupling structure and common defected ground (DGS) that physically separates antennas from each other. The operates in 24 40 GHz frequency range. innovation MIMO design involves novel integration two arc-shaped symmetrical elements with dimensions 35 × 1.6 mm3 placed perpendicular benefits employing an arranged perpendicularly are exemplified by enhancement its overall performance...
This article demonstrates the design development, fabrication, and testing of an offset edge-fed monopole hybrid fractal antenna for ultra-wideband (UWB) applications at a frequency 3.2 GHz.The proposed is compact 38.12 mm × 38.42 mm, slotted, uses combination two numbers Koch plus Minkowski technology.Antenna resonates four frequencies, i.e., quad tuned (3.2 GHz, 4.94 7.21 10.10 GHz).The reflection coefficient, S 11 < -10 dB obtained excellent UWB fractional bandwidth 119.55% (2.85 GHz to...
Abstract In this article, a dual‐band hybrid cylindrical dielectric resonator antenna (CDRA) is designed, analyzed, and experimentally validated. Miniaturization frequency behavior are achieved by loading circular copper strips on top of the CDRA. Hence, resonates at 4.4 6.1 GHz covering −10 dB bandwidths 600 MHz 500 MHz, respectively. The proposed CDRA excited using rectangular slot for HEM Y 11 X modes. demonstrates good gain (4.9 dBi 5.6 GHz), high efficiency (>88% all operating...