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In this paper, a coupled Pi-shaped double negative metamaterial has been validated using two established retrieval methods: Nicolson-Rose-Weir method and Transmission-Reflection Method. The proposed unit cell was designed on a Rogers RO3010 substrate with dielectric constant of 10.2 and a thickness of 1.28 mm. The simulation has been performed under commercially available CST Microwave Studio environment...
In this paper, a lower band negative index metamaterial is developed for specific absorption rate reduction. The proposed metamaterial is printed on the plastic cover body of the wireless device. The metamaterial structure has been designed and characterized using FIT technique based EM simulator CST Microwave studio. The perceptible outcome of this paper is specific absorption reduction using plastic...
In this paper, a paper based negative indexed metamaterial is proposed for electromagnetic absorption reduction of portable wireless devices. The metamaterial structure has been designed and characterized using FIT technique based EM simulator CST Microwave studio. The main outcomes of the paper are EM absorption reduction by 14.23% and 15.3% at 0.9 GHz and 1.80 GHz, respectively using metamaterial...
In this paper, a dual band planar inverted-F antenna (PIFA) is proposed for cellular phone applications. The antenna consists of E-shaped patch, shorting wall, feed point and ground plane. A 1.6 mm thicken FR-4 substrate is used in ground plane to reflect the effect of the circuit board. The finite integration technique (FIT) based computer simulation technology (CST) microwave studio is used in major...
In this paper, a multi slot-loaded microstrip dual band antenna is presented for energy harvesting applications at 2.4/5.8GHz Wireless Local Area Network (WLAN) bands. The incorporation of C-shape slot, rectangle slot and a pair of I-shape slots on patch antenna was supportive for excitation of dual distinctive resonance bonds. Such integration was also found effective in delivering good impedance...
This paper presents an aperture-coupled microstrip antenna, which is operating at dual band of millimeter-wave (mmW) frequencies, 28GHz and 38GHz. The aperture antenna was integrated with multilayer substrate construct on 5-layers Low temperature Co-fiber Ceramic (LTCC) with 5 mils thickness. The driven patch was applied to enhance the bandwidth. The bandwidths using are 9.1 percent at 28GHz and 9...
This paper is aimed to present a very small sized patch antenna for UWB applications. The antenna used microstrip feed-line. This antenna is very small in dimension. The total size of the antenna is 20×18mm2. Triangular slots in the partial ground plane, are used to get a better bandwidth. The antenna has VSWR<2 over the bandwidth. The whole designing and simulation process of the antenna is done...
A single-layer linearly polarized reflectarray element namely Concentric Circle Square Ring (CCSR) for Ku-band is presented in this paper. The adjustment of the reflected phase of the reflectarray element via variable capacitive loading which is realised by connecting the two rings with varactor diode. By using the full-wave EM field simulator-CST, simulation of the single element to perform exact...
A new metamaterial with negative permeability is presented in this study. Negative permeability metamaterials are called mu-negative (MNG) metamaterial as well. The transmission co-efficient of this metamaterial shows resonance at a certain frequency in the C-band of microwave frequency range for the z-axis wave propagation. It also exhibits the characteristics of a mu-negative (MNG) metamaterial...
In this paper, a metamaterial based triangular shaped electromagnetic cloak is presented. The pi-shaped metamaterial shows wideband NZRI (near-zero refractive-index) characteristics in the C-band of microwave spectra. The metamaterial was then utilized in designing a triangular shaped cloak. The cloak hides a metal cylinder electromagnetically where the metamaterial shows NZRI property. At the cloaked...
A new double negative metamaterial for S-band applications is presented in this paper. Unit-cell and one-dimensional planar array structure are analyzed. Two array configurations, 2 × 2 array and 4 × 4 array structures of proposed unit cell have been analyzed. The finite integration technique (FIT) based on (CST) Microwave Studio is used in this investigation. The designed unit-cell shows double negative...
A reconfigurable reflectarray single element and 2×2 sub-array with a single varactor embedded inter-patch are presented. A phase diagram of both configurations and the relation to a radiation pattern is analyzed. Simulated radiation patterns from three designs namely CCSR, CRP and CRG with single element phase characteristics as a reference are reported to demonstrate reconfigurability of elements...
Precise contoured beam is very important in designing antenna system for satellite broadcasting application. Through accurate contoured beam design, constant signal and optimum beam performance can be achieved throughout the region. For the case of Malaysia, two separate contoured beams for the peninsular and Borneo regions must be obtained. In this paper, a lightweight non-symmetrical array feed...
An omnidirectional dielectric resonator antenna of cuboid shape is designed for LTE femtocell base station. The dielectric antenna resides above a FR4 substrate, and is fed by a coaxial probe at the center of the antenna. This proposed antenna is appropriate for Long term evolution (LTE) band 7 (2500–2570 MHz, 2620–2690 MHz) and LTE band 38 (2.57–2.62 GHz), the impedance bandwidth is 236 MHz. The...
In this paper, a circularly polarized antenna is proposed for satellite communication system. Commercially available Finite Integration Technique (FIT) based software Computer Simulation Technology (CST) microwave studio and finite element method solver based High Frequency Structural Simulator (HFSS) have been used in this analysis. The proposed antenna achieved 3dB axial ratio of 30 MHz with −10dB...
In this paper, a circularly polarized antenna is presented for small satellite communication. The proposed antenna is assimilated with an octagonal shape radiator with rectangular cut-outs on opposite edges. The proposed antenna is fed by a coaxial pin. The antenna shows measured −10dB impedance bandwidth of 610 MHz (7.07–7.68 GHz) with 3dB axial ratio (AR) bandwidth of 260 MHz (7.35–7.61 GHz).
Precise contoured beam is important especially in broadcasting satellite application. In order to achieve a precise contoured beam for Malaysia, selection of feed structures is very important. In this paper, feed structures for horn antenna and array antenna are studied for a parabolic reflector antenna system. Feed positions of the feed structures are determined by a newly developed feed position...
A miniaturized ultra-wideband antenna is presented for using in microwave imaging systems. This antenna structure consists of a radiating patch, a microstrip transmission line, and a partial ground plane which provides a wide bandwidth covering from 3.65 GHz to more than 11 GHz frequency. It has overall dimensions of 16 mm × 21 mm× 1.6 mm with a compact size. Negligible distortion is observed from...
The combined effort of the Universiti Kebangsaan Malaysia and the Kyushu Institute of Technology (KYUTECH) to develop
a small-satellite antenna is presented in this paper. Microstrip antennas offer an ideal solution to satellite communication
requirements due to their light weight and low profile. In this paper, a compact single-layer coaxial-probe-fed
circularly polarized high-gain patch antenna...
The aim of this paper is to investigate the effects of the distance between the human head and internal cellular device antenna on the specific absorption rate (SAR). The effects of the metal-glass casing of mobile phone on the SAR values were observed in the vicinity of the human head model. Additionally, the reflection coefficients were investigated in all cases to evaluate antenna performance....
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