Nowadays synthetic aperture radar (SAR) and multiple-input-multiple-output (MIMO) antenna systems with the capability to radiate waves in more than one pattern polarization are playing a key role modern telecommunication systems. This is possible use of arrays as they offer advantages high gain beamforming capability, which can be utilized for controlling radiation electromagnetic (EM) interference immunity wireless However, growing demand compact array antennas, physical footprint needs...

In this review paper, a comprehensive study on the concept, theory, and applications of composite right/left-handed transmission lines (CRLH-TLs) by considering their use in antenna system designs have been provided. It is shown that CRLH-TLs with negative permittivity (ε <; 0) permeability (μ unique properties do not occur naturally. Therefore, they are referred to as artificial structures called "metamaterials". These include series left-handed (LH) capacitances (C <sub...

An approach is proposed to reduce mutual coupling between two closely spaced radiating elements. This achieved by inserting a fractal isolator the The an electromagnetic bandgap structure based on metamaterial. With this technique, gap radiators reduced ~0.65λ for reduction in of up 37, 21, 20, and 31 dB X-, Ku-, K-, Ka-bands, respectively. two-element antenna shown operate over wide frequency range, i.e., 8.7-11.7, 11.9-14.6, 15.6-17.1, 22-26, 29-34.2 GHz. Maximum gain improvement 71% with...

Phase Change Materials (PCMs) present cutting-edge technology with substantial promise for advancing sustainable and energy-efficient cooling in buildings. These materials can absorb release latent heat during phase transitions, facilitating thermal energy storage temperature regulation. This comprehensive literature review explores various strategies methods implementing passive PCMs The integration of enhances multiple approaches, including solar control, ground cooling, ventilation-based...

A novel printed diversity monopole antenna is presented for WiFi/WiMAX applications. The comprises two crescent shaped radiators placed symmetrically with respect to a defected ground plane and neutralization lines connected between them achieve good impedance matching low mutual coupling. Theoretical experimental characteristics are illustrated this antenna, which achieves an bandwidth of 54.5% (over 2.4-4.2 GHz), reflection coefficient <;-10 dB coupling <;-17 dB. An acceptable agreement...

A decoupling metamaterial (MTM) configuration based on fractal electromagnetic‐bandgap (EMBG) structure is shown to significantly enhance isolation between transmitting and receiving antenna elements in a closely‐packed patch array. The MTM‐EMBG cross‐shaped assembly with fractal‐shaped slots etched each arm of the cross. fractals are composed four interconnected‐‘Y‐shaped’ that separated an inverted‐‘T‐shaped’ slot. placed individual antennas 2 × Measured results show average inter‐element...

This paper presents a unique technique to enhance isolation between transmit/receive radiating elements in densely packed array antenna by embedding metamaterial (MTM) electromagnetic bandgap (EMBG) structure the space suppress surface currents that would otherwise contribute towards mutual coupling elements. The proposed MTM-EMBG is cross-shaped microstrip transmission line on which are imprinted two outward facing E-shaped slits. Unlike other MTM structures, there no short-circuit...

To mitigate potential interferences with coexisting wireless systems operating over 3.3-3.6 GHz, 5.15-5.35 or 5.725-5.825 GHz bands, four novel band-notched antennas suitable for ultra-wideband (UWB) applications are proposed. These include UWB a single wide notched band, narrow dual and triple bands. Each antenna comprises half-circle shaped patch an open rectangular slot ground plane. Good performance is achieved by using high permittivity low dielectric loss substrate, inserting...

This paper presents a study of planar antenna-array inspired by the metamaterial concept where resonant elements have sub-wavelength dimensions for application in microwave medical imaging systems detecting tumors biological tissues. The proposed antenna consists square-shaped concentric-rings which are connected to central patch through common feedline. array structure comprises several antennas that arranged surround sample breast model. One at time is used transmission-mode while others...

Abstract This paper presents the results of a study on improving performance parameters such as impedance bandwidth, radiation gain and efficiency, well suppressing substrate loss an innovative antenna for on-chip implementation millimetre-wave terahertz integrated-circuits. was achieved by using metamaterial substrate-integrated waveguide (SIW) technologies. The structure comprises five alternating layers metallization silicon. An array circular patches with metamaterial-inspired...

This letter investigates the feasibility of designing a high gain on-chip antenna on silicon technology for subterahertz applications over wide-frequency range. High is achieved by exciting using an aperture fed mechanism to couple electromagnetics energy from metal slot line, which sandwiched between and polycarbonate substrates, 15-element array comprising circular rectangular radiation patches fabricated top surface layer. An open ended microstrip orthogonal slot-line, implemented...

A metamaterial photonic bandgap (MTM‐PBG) periodic structure is used as a decoupling frame to improve the isolation between transmit–receive (T/R) sections of densely packed array antenna in synthetic aperture radar (SAR) and multiple‐input–multiple‐output (MIMO) systems. With this technique MTM‐PBG shown effectively suppress surface wave propagations T/R antennas by an average 12 dB. layer comprises arrangement dielectric circles etched cross‐shaped microstrip that inserted radiating...

Abstract This paper presents the results of a study on developing an effective technique to increase performance characteristics antenna arrays for sub-THz integrated circuit applications. is essential compensate limited power available from sources. Although conventional array structures can provide solution enhance radiation-gain however in case small-sized radiation properties be adversely affected by mutual coupling that exists between radiating elements. It demonstrated here...

Abstract An effective method is presented for suppressing mutual coupling between adjacent radiating elements which based on metasurface isolation multiple‐input multiple‐output (MIMO) and synthetic aperture radar (SAR) systems. This achieved by choking surface current waves induced over the patch antenna inserting a cross‐shaped structure elements. Each arm of constituting etched with meander line slot. Effectiveness demonstrated 2 × array that operates six frequency subbands in X, Ku, K...

Abstract The paper presents a technique to enhance the isolation between adjacent radiating elements that is common in densely packed antenna arrays. Such antennas provide frequency beam‐scanning capability needed multiple‐input multiple‐output (MIMO) systems and synthetic aperture radars. method proposed here uses metamaterial decoupling slab (MTM‐DS), which located elements, suppress mutual coupling would otherwise degrade efficiency performance both transmit receive mode. MTM‐DS consists...

In this communication, a novel dual-polarized highly folded self-grounded Bowtie antenna that is excited through I-shaped slots proposed for applications in sub-6 GHz 5G multiple-input-multiple-output (MIMO) systems. The consists of two pairs radiation petals whose base embedded double layer FR-4 substrate with common ground-plane which sandwiched between the layers. defected located under elements. Each pair elements are microstrip line on top RF signal 180&#x00B0; out phase respect to each...

The paper presents a feasibility study on the design of new metamaterial leaky-wave antenna (MTM-LWA) used in construction 1 × 2 array which is implemented using substrate-integrated waveguide (SIW) technology for millimetre-wave beamforming applications. proposed consists two LWAs with unit-cells etched top surface SIW. unit-cell, an E-shaped transverse slot, causes leakage loss and interrupts current flow over SIW to enhance array’s performance. dimensions LWA are 40 10 0.75 mm3....

Abstract This paper presents a novel on-chip antenna using standard CMOS-technology based on metasurface implemented two-layers polyimide substrates with thickness of 500 μ m. The aluminium ground-plane 3 m is sandwiched between the two-layers. Concentric dielectric-rings are etched in under radiation patches top-layer. comprise concentric metal-rings that arranged × matrix. antennas excited by coupling electromagnetic energy through gaps microstrip feedline created bottom polyimide-layer....

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...

A type of telecommunication technology called an ultra-wideband (UWB) is used to provide a typical solution for short-range wireless communication due large bandwidth and low power consumption in transmission reception. Printed monopole antennas are considered as preferred platform implementing this because its alluring characteristics such light weight, cost, ease fabrication, integration capability with other systems, etc. Therefore, compact-sized printed antenna improved gain efficiency...

This paper presents a planar multi-circular loop antenna with wide impedance bandwidth for next generation mm-wave systems. The proposed comprises three circular rings partial ground plane square slot. resonating structure is designed on 0.254 mm thin RO5880 substrate relative permittivity of 2.3. single element the design showed resonance response from 26.5 to 41 GHz, peak gain 4 dBi and radiation efficiency 96%. multicircular ring transformed into four-element array system. size kept at...

To support various fifth generation (5G) wireless applications, a small, printed bowtie-shaped microstrip antenna with meandered arms is reported in this article. Because it spans the broad legal range, developed can serve or reject variety of applications such as fidelity (Wi-Fi), sub-6 GHz, and ultra-wideband (UWB) 5G communications due to its multiband characterization optimized rejection bands. The built on an FR-4 substrate powered via 50-Ω feed line linked right bowtie’s side. left...

This article presents a sub-6GHz ISM-band flexible wearable MIMO antenna array for wireless body area networks (WBANs) and biomedical telemetry devices. The is based on metasurface inspired technology. consists of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> matrix triangular-shaped radiation elements that were realized 0.8 mm thick Rogers RT/duroid 5880...