An effective technique for reducing the mutual coupling between millimeter-wave dielectric resonator antennas (DRAs) using a novel metamaterial polarization-rotator (MPR) wall is investigated and presented. The reduced by embedding an MPR two DRAs, which are placed in H-plane. Using this wall, TE modes of become orthogonal, reduces DRAs. proposed composed 1 × 7 unit cells along E-plane. more than 16 dB on average (8 at 57 GHz, 22 60 14 62 GHz) when antennas. nearly has no effect antenna...

A new dielectric resonator antenna (DRA) for a millimeter-wave (mm-wave) multiple-input-multiple-output system is presented. Two approaches are exploited to reduce the mutual coupling between two elements. First, frequency selective surface (FSS) wall inserted DRAs free-space radiation. Then, slots with different size acting like an LC etched from common ground plane of structure current. The designed FSS has wideband characteristic 40 70 GHz. optimized desired 57-63 high isolation -30 dB...

We report on the elaboration and transport properties of a sandwich like 2-dimensional Ti3C2Tx MXene/Graphene composite through alternating electrospray MXene graphene materials. The structural electrical were systematically investigated with respect to content. surface roughness samples has found decrease considerably after integration. Electrical measurements show clear trend increase in both conductance Hall carrier mobility concentrations, even reach values 9.5 × 104 S/cm 54.58 cm2/V s,...

This article proposes an efficient and complete wireless power transfer (WPT) system (WPTS) for multipurpose biomedical implants. The WPTS is composed of a self-diplexing implantable antenna, rectifier, WPT transmitter (WPT Tx). proposed capable simultaneously transmitting recorded data recharging the batteries devices (so as to elongate implant life). Tx occupies dimensions 50 ×50 ×1.6 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup>...

In this paper, a novel 4 times two-layer Butler matrix based on broad-band slot-coupled directional coupler is presented and implemented at 5.8 GHz using coplanar waveguide technology. With the coupler, proposed was designed without any crossovers as used in conventional matrices, which leads to significant size reduction loss minimization. To examine performance of matrix, experimental prototypes multilayer were fabricated measured. Furthermore, four-antenna array also then connected form...

This article presents a low-profile multiple-input–multiple-output (MIMO) implantable antenna system, including capsule endoscopy and scalp implantation at medical implant communication service (MICS) band (402–405 MHz), industrial, scientific, (ISM) (433.1–438.8 MHz). It consists of two elements with an edge-to-edge gap <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.0018\lambda _{g}$...

A quad-element multiple-input–multiple-output (MIMO) antenna is designed at 433 MHz industrial, scientific, and medical (ISM) band, to increase the transmission data-rate minimize multipath fading. The proposed MIMO consists of semicircular meandered radiators with a shared ground. It optimized inside an implantable device in human head model. antenna’s results show 10 dB fractional bandwidth 38.26% (355–523 MHz) peak realized gain −28.3 dBi. high isolation ( <inline-formula...

In this study, an ultra–miniaturized implantable antenna based system with ultra-wideband characteristics in the industrial, scientific, and medical band (i.e., 2.4–2.48 GHz) is proposed for biomedical applications. A biocompatible flexible liquid crystalline polymer material, Rogers ULTRALAM (tan <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\delta =0.0025$ </tex-math></inline-formula>...

A new flexible circularly polarized (CP) wearable antenna is proposed for Wireless Body-Area Network systems (WBAN) operating at 5.8 GHz. The circular polarization enabled by combining a microstrip-line monopole feed and an inverted L-shaped conformal metal strip extended from coplanar waveguide. shows satisfactory performance in terms of gain specific absorption rate (SAR) separation 12 mm human body model. To minimize body-antenna separation, <inline-formula...

In this paper, we present a new ultra wideband antenna design with band rejection for UWB applications. A CPW-fed circular patch radiates through aperture, which ensures impedance matching and stable omnidirectional pattern over an frequency range, from 3GHz to 10.6GHz. order avoid interference

Multiple input multiple output-ultrawide band (MIMO-UWB) systems are experimentally evaluated for underground mine high-speed radio communications. Measurement campaigns using two different antenna configurations have been made in an gold mine. Furthermore, scenarios, which the line of sight (LoS) and non-LoS (NLoS), i.e., taking into account mining machinery effect, distinguished studied separately. In fact, channel is characterized terms coherence bandwidth, path loss, shadowing,...

This study presents a multi-band conformal antenna based endoscopic system for robust biotelemetry communications, which covers five important bands, including the MedRadio (401–406 MHz), Industrial, Scientific, and Medical (ISM) (433.1–434.8 MHz, 868–868.6 902–928 midfield (1200 MHz) bands. These bands are intended functions such as biotelemetry, power saving, wireless transfer (WPT). The proposed is printed on flexible material Rogers ULTRALAM with thickness of only 0.1 mm, can be easily...

This letter proposes a low-profile substrate integrated waveguide (SIW) cavity backed self-quadruplexing antenna for wearable transceivers. The full-mode circular SIW is split into four unequal quarter-mode (QMSIW) cavities using the two slots on upper layer of cavity. proposed uses C-shaped and arc-shaped different dimensions in each QMSIW resonator to operate at wireless local area network bands (3.5, 4.9, 5.4, 5.8 GHz). measured gains are 4.4, 5.07, 5.40, 5.7 dBi 3.5, GHz, respectively....

This paper presents a detailed measurement and performance analysis of near-ground propagation channels in an underground mine for both Line-of-Sight (LOS) Non-Line-of-Sight (NLOS) scenarios. The is derived from channel measurements conducted at frequency 2.4 GHz with bandwidth 200 MHz, utilizing four different combinations transmitter-receiver (Tx-Rx) antenna heights ranging 10 cm to 120 cm. Key characteristics such as large-scale path loss, time dispersion, coherence are reported...

This letter describes the fabrication and characterization of a fluidic patch antenna operating at S-band frequency (4 GHz). The prototype is composed nanocomposite material made by liquid metal alloy (eutectic gallium indium) blended with single-wall carbon-nanotube (SWNTs). then enclosed in polymeric substrate employing UV-assisted direct-writing technology. antennas specimens feature excellent performances, perfect agreement simulations, showing an increase electrical conductivity...

The performance of multiple-input-multiple-output (MIMO) system operating at the 60 GHz band is investigated based on experimental data in a real underground mine gallery. However, millimeter wave (mmW) channels face some challenges such as high propagation loss. In order to overcome this issue, planar microstrip antenna array has been designed, and fabricated. Moreover, effect miners' activity vicinity short-range wireless link studied. Statistical parameters channel, RMS delay spread, path...

A novel millimeter-wave (mm-wave) 90° phase-compensated hybrid coupler using the ridge-gap waveguide (RGW) technology is studied and developed. The low-loss at mm-wave frequency bands, whereas conventional transmission lines, such as microstrip or substrate integrated waveguides, yields relatively a high amount of insertion loss. proposed designed large coupling apertures, which with their phase variation over apertures can compensate for progressive achieve low output-phase error. 3-db...

In this article, a novel design of dielectric resonator antenna (DRA) with reconfigurable radiation pattern capability is presented. Reconfigurability in the azimuth plane achieved by symmetrically placing six electromagnetic bandgap (EBG) sectors around DRA. Each sector composed 26 circular-shaped mushroom-like EBG unit cell. order to achieve 360° reconfigurability minimum number diodes, network metallic veins printed on conductor-backed slab used group and connect vias each sector....

In this study, a coplanar waveguide‐fed reconfigurable antenna using crescent‐shaped fractal geometry is presented. The frequency approach obtained radio‐frequency positive intrinsic negative diodes, resistor, and inductors. proposed has successfully allowed switching up to eight bands between 1.46 6.15 GHz. Good results have been in terms of stable omnidirectional radiation patterns. realised gains the system, these bands, vary from 0.52 5.67 dBi. designed advantages multiband structure...

A highly compact substrate integrated waveguide (SIW) self-diplexing antenna, operating at wireless local area network bands (3.6 and 5.4 GHz), is proposed in this letter. The antenna consists of two closely placed (0.022λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> , where λ the guided wavelength 3.6 GHz) quarter-mode SIW resonators, exited by coaxial probes. Two rectangular slots are added to closed-ends each resonator generate...

In this paper, a high-gain circularly polarized (CP) hexagonal antenna array is proposed for RF energy-harvesting applications. The intended to operate at the frequency of 5.8 GHz. It composed 6 multilayer substrate CP antennas excited by an X-shaped aperture-coupling feed structure. A selective surface (FSS) was added further improve gain, resulting in maximum gain 12.7 dBi per element. main advantage ability cover 360 degrees azimuth plane with high all directions without use any...

New multiband antenna array structure with high gain is proposed for 5G communicationhandheld systems (700MHz/3.5 GHz and 28/38 GHz). The designed using acombination of sub-6GHz mm-Wave arrays. based on S-shaped strip etched onthe top side to operate at 700 MHz. On the other hand, 3.5GHz band generated by coupling ameander line an inverted-C bottom side. Finally, onfour quadrupole elements a 1:4 microstrip power divider. This configuration ensures that all fourquadrupole antennas receive...

In this study, a 60 GHz optically transparent microstrip (OTM) patch antenna array is designed, fabricated and measured. Gold meshes are implemented for the two layers of antenna. A numerical parametric study on positioning meshed performed to give design considerations optimise both electromagnetic optical performances OTM antennas at band. The simulation measured results with theoretical maximum transparency up 74.6% compared light reflecting reference Both have similar reflection...