Antenna with artificial magnetic conductor for wireless application

— This paper discussed the recent works on Artificial Magnetic Conductor (AMC) with the antenna. Two different application for antenna with AMC have been discussed. The first application is the antenna with AMC that has been used for RFID system to detect the metal object. Without incorporating AMC with antenna the system cannot be detected. When the AMC is attached with the RFID Tag antenna the system is back to normal where longer distance is achieved. The second application is used for flexible AMC using textile material for signal transmission enhancement. Using two antennas for on body application the system has been tested using AMC and without AMC. It shows that the transmission is better when there is an AMC attach to the body compared without AMC. Index Terms — Artificial Magnetic Conductor, high impedance surface, metamaterial, reflection phase

Switchable Wideband Metamaterial Absorber and AMC reflector for X-band Applications and Operations

A single layered metamaterial structure with capabilities of switching from a wideband metamaterial absorber to an AMC reflector and vice versa is presented in this paper. A flame retardant 4 substrate with physical thickness of 1.60mm was used. The absorption rate, reflection rate, reflection phase and surface current distribution were studied and discussed. The operational incidental wave angles were varied from 0o to 65o. A peak reflection of about 90% was achieved at 11.20 GHz with a usable bandwidth (-90 to +90) of 3.01 GHz by the AMC reflector. The metamaterial absorber demonstrated a wideband performance (from 8.10 GHz to 14.30 GHz). It achieved 100% absorption at 11.20 GHz and not less than 6

X-band operations metamaterial absorber with extended circular ring topology for size reduction

A metamaterial electromagnetic wave absorber consisting of a big circular ring patch with four smaller suppression circular rings is presented in this report. The metamaterial electromagnetic wave absorber introduces the concept of size reduction by suppressing the resonance frequency. An FR4 substrate was used and the incidental wave angles were varied from 00 to 600. Simulations results shows peak absorption of 100% was achieved at 10.7 GHz by the absorber for both TE and TM polarization incident waves. Minimum absorption for both TE and TM mode of 90.6% was achieved under TE mode. The metamaterial absorber was being tested with and Ultra-wide band antenna and the results were reported. © 2017, Institute of Advanced Engineering and Science. All rights reserved

Compact CPW-fed ultra-wideband (UWB) antenna using denim textile material

A compact and flexible CPW-fed UWB antenna is designed using denim material. The proposed structure consists of an eclipse patches and modification of ground plane to obtain an impedance bandwidth between 2.52 GHz and 13.35 GHz. The dimension of antenna is 35 mm × 45 mm with thickness of 0.78 mm. The antenna is simulated using CST Microwave Studio. The structure is then fabricated using copper tape as radiating element and denim textile as substrate. The dimension of antenna are studied and optimized to obtain UWB requirement. The simulated and measured result are compared and analyzed in this pape

Electromagnetic band gap structure for planar ultra wide band antenna

An innovative technique involving the usage of a mushroom Electromagnetic Band Gap (mEBG) structure with an ultra wideband (UWB) antenna is reported in this work. A single unit of mEBG lattice is incorporated within a novel UWB antenna to perform the band rejection operation. The antenna can be fixed to reject or reduce the transmit power for any band within the UWB spectrums of frequencies through a careful design of this mEBG structure, thus solving the problems concerning interference and reducing the requirements for complex filtering electronics within the UWB devices

Double layer polarization insensitive metamaterial absorber with dual resonances

This paper presents the design of double layer polarization insensitive metamaterial absorber with dual resonant frequencies at 9 and 10 GHz. A unit cell of the metamaterial consists of four circular rings with copper lines printed on 0.8 mm thick FR4 substrate. The simulated result shows that the dual band metamaterial absorber achieves 89.25 and 95.97% for normal incident electromagnetic waves at 9 and 10 GHz respectively. The corresponding full width half maximum (FWHM) are 2.99 and 3.32%. The simulation result verified that the absorber is perform well at any polarization of incident electromagnetic waves and operate at wide operating angles which are 63° and 62° for TE mode and TM mode respectively

Dual-directional polarization insensitive multiband metamaterial absorber

This paper presents the design, simulation, fabrication, and measurement of dual-directional polarization insensitive multiband metamaterial absorber (MMAbs). The MMAbs is designed at three resonating frequency in X-band. The structure of MMAbs consists of two-layers 0.8 mm-thick FR4 substrate with three concentric copper rings-shaped structures at different radius printed on the top and bottom surface of the combined substrates. A full copper layer is placed between two FR4 substrates to reduce transmittance. The circular ring-shaped is very symmetry in nature consequently, the designed MMAbs insensitive to all polarization angles of incident electromagnetic (EM) waves for normal angle of incident. From simulation, three absorption peaks are obtained at 8, 10, and 12 GHz with absorbance of 97.27%, 83.55%, and 78.49% respectively for normal incident angle of EM waves. The corresponding full width half maximum (FWHM) bandwidths are 5.39% (7.77 - 8.20 GHz), 3.32% (9.78 - 10.11 GHz), and 2.57% (11.91 - 12.22 GHz). The structure is capable to operate at wide variation angle of incident wave. The operating angle which the MMAbs can absorb at least 50% of incident EM wave are 67° for both TE and TM polarizations. The simulation results are verified through experimental result. Mutual agreement is achieved between simulation and experimental results

Dual resonance circular ring-shaped metamaterial absorber with wide operating angle

This paper proposed a dual resonant circular ring-shaped metamaterial absorber (MMAbs) with wide operating angle in X-band frequency. The structure is constructed on FR4 substrate. The resonating elements are designed using two circular rings structure with different radius. The resonating elements are printed on the top surface of FR4 substrate, while at the bottom layer; a full copper layer is placed. The performance of the designed structure is observed using CST software. From the simulation, the proposed structure achieves high absorbance, which is 93.80% and 86.19% at 9 GHz and 11 GHz respectively for normal incident EM wave. Then, the structure is also simulated for oblique incident angles. It is observed that the operating angle of the proposed metamaterial absorber is 69° for both TE and TM polarization. The measurement is done to validate the simulated result

Dual band polarization insensitive metamaterial absorber in X-band

This paper presents the design of dual band polarization insensitive metamaterial absorber at 9 GHz and 10 GHz. The unit cell of the metamaterial consists of four circular rings copper with copper lines printed on 0.8 mm thick FR4 substrate with dielectric constant of 4.6 and loss tangent of 0.019. The simulated result shows that the dual band metamaterial absorber achieves 97.00% and 97.77% for normal incident electromagnetic waves at 9 GHz and 10 GHz respectively. The corresponding full width half maximum (FWHM) are 3.59% and 3.31%. The simulation result verified that the absorber well performance at any polarization of incident electromagnetic waves