A flexible and low profile frequency selective surface (FSS) with bandstop behavior for X-band signals is demonstrated in this paper to support the demand of wireless communication devices today's market. The resonating element FSS realized using convoluted ring loop that inspired by conventional element. An additional four stubs are added at each 90° miniaturize its overall dimension. has reduced dimension shape 0.25 λ0 a reduction 33%. proposed developing utilizing polyethylene...

In this article, a novel uniplanar ultra-wideband (UWB) stop frequency selective surface (FSS) was miniaturized to maximize the gain of compact UWB monopole antenna for microwave imaging applications. The single-plane FSS unit cell size only 0.095λ × lower-operating had been introduced, which by combining square-loop with cross-dipole on FR4 substrate. proposed hexagonal printed substrate coplanar waveguide feed, further backed at 21.6 mm 3 array. modeled an equivalent circuit, while...

A new design method that greatly enhances the reflectivity bandwidth and angular stability beyond what is possible with a simple Salisbury screen described. The performance improvement obtained from frequency selective surface (FSS) which sandwiched between outermost 377 Ω/square resistive sheet ground plane. This designed to generate additional reflection nulls at two predetermined frequencies by selecting size of unequal length printed dipoles in each unit cell. multiband realised...

Advancement in technology has opened the doors for terahertz (THz) frequency range to be applied different fields a variety of applications and efficient propagation THz waves is an important parameter consider. This paper bibliometric analysis past twenty years’ research progress toward waveguides their propagation. The issupported by VOSviewer software. includes distribution journal publications, contributions authors waveguide field, affiliations, highly impacted journals, top keywords,...

Millimeter-wave and terahertz (THz) frequency bands are being explored in wired wireless communication systems due to ongoing demands for increased data rates. Recently, it has been proposed that twisted-pair cables, already part of existing infrastructure, could be utilized terabit-per-second transmission by exploiting THz radiation between the copper wires. can wirelessly transferred through dielectric gap air The material wires a CAT6 (Category 6) cable considered circular hollow-core...

With an increase in users and devices, fast data rates are turning increasingly desirable wired wireless transmission. Moving towards higher frequency bands, especially the multi-GHz region, is one potential solution to fulfil user demands for a high rate. Recently, it was demonstrated that using waveguide technique order guide modes already established twisted pair cable, rate of terabits per second could be attained. The air-dielectric space inside cable can used transmit terahertz waves...

Abstract In this article, we show that the −10 dB reflectivity bandwidth of a Salisbury screen operating at normal incidence is increased by 56% when lossy spiral shaped frequency selective surface inserted between outermost 377 Ω per square resistive sheet and ground plane. Moreover, structure exhibits significantly better angular stability suitable for suppressing radar backscatter simultaneously in TE TM Reflectivity predictions 40° are shown to be close agreement with bistatic measured...

An E-shaped antenna incorporated with electromagnetic band-gap (EBG) is presented for smart-watch applications. In order to fit the requirement of smart-watch, need be compact, lightweight, low profile, least SAR values, highly directive, and robust against load's impact caused by wrist tissues. The design has reduced radiation towards tissue around 23 dB, sustains loading maximum averaged values are obeyed both standard FCC CNIRP. overall dimension 48×36×3.27mm <sup...

&lt;p class="Normal1"&gt;The demand for health technology is increasing rapidly especially in telemetry applications. These applications generally use implanted antennas to be utilized data transfer from patients another reader device. This procedure can make the care more efficient, since it provides fast diagnosis and treatment patient. work presents a design of antenna used Pacemaker application Medical Implant Communication Services (MICS) (401 MHz-406 MHz). By introducing Compact...

The radar absorbing properties of a Salisbury screen are investigated for structure which is constructed using high impedance ground plane. Simulated and experimental results in the frequency band 8–12 GHz show that this physical arrangement can be used to obtain significant reduction thickness absorber when specified −10 dB reflectivity bandwidth range 18–37%

This paper proposes a fractal square loop frequency selective surface (FSS) with dual-band stop behavior. The FSS elements are etched on FR-4 substrate to attenuate signals at GSM900, GSM1800 and IMT2000 bands while transmitting other microwave signals. unit cell geometry is modification of the conventional which shows an improvement in stability for oblique incidence up 45° both TE TM polarizations. proposed shifts onset grating lobe outside interest without compromising target resonant...

The narrow bandwidth and low gain performances of a reflectarray are generally improved at the cost high design complexity, which is not good sign for high-frequency operation. A dual resonance asymmetric patch antenna with single layer proposed in this work 5G communication 26 GHz. developed from square by tilting its one vertical side carefully optimized inclination angle. progressive phase range 650° acquired embedding circular ring slot ground plane element improvement. 332-element,...

In this work, a compact dual-band semi-flexible antenna operating at 2.45 GHz and 5.8 for the industrial, scientific medical (ISM) band is presented. The fabricated on substrate material, Rogers Duroid RO3003™ with low-profile feature dimensions of 30×38 mm2 which makes it good solution wearable applications. Bending investigation also performed over vacuum cylinder diameters are varied 50 mm, 80 mm 100 that represents average human arm’s diameter. bending shows reflection coefficients all...

This paper introduced the 4/spl times/4 Butler matrix as beamforming network combined with 4 linear antenna arrays to produce four narrow steerable beams. The designed was aimed for resonance frequency 900 MHz in application of GSM base station transmitter. position radiation patterns achieved by this project then compared theoretical calculation and simulation using PCAAD simulation. resultants signal strength beams were indicated low level that may caused loss factor components used.

This paper presents a thorough review of the techniques involved in enhancement efficiency performance reflectarray antenna. The effect selection suitable patch element or proper feeding mechanism on improvement is studied detail. Reflectarray loss quantification examined relation to design improvement. A low with wide reflection phase range and properly illuminated aperture are supposed offer high performance. Additionally, placement, orientation position surface can also affect its...

The THz spectrum (0.1-10 THz) is a region between optics and electronics, it still not fully explored unlicensed.Recent studies show that will bring revolution in technology, especially the field of communication.Future communication technologies such as 6G Terabit DSL utilize this band has capability to support high data rates Tbps.For designing an efficient system propagates these waves with low loss, required understand propagation channel properly.THz modeling at its infancy stage,...

A new Salisbury screen absorber design is presented, which yields a significantly reduced sensitivity to angle of incidence. This achieved by using an artificial magnetic ground plane, designed scatter the reflected signals in conjugate phase relationship with respect change electrical spacing between plane and resistive screen. Numerical experimental results range 8–12 GHz are used demonstrate that scan compensation can be obtained over angular 0–40° thus removing shift resonant frequency...