| Manuscript Title: | 3D FDTD Design and Comparison Performance of Power Dividers/Combiners in Different Configurations |
| Manuscript Id: | IJMOT-2018-2-1502 |
| Abstract: | This paper presents a technique to dividing and combining power in microwave circuits with an improvement of the structure and the electromagnetic characteristics. Different configurations of structures have been simulated with finite difference time domain method FDTD. We have used a microstrip circuits to design and modélize multiway power divider. First we design a two-way power divider/Combiners in two different configurations, then we implement an algorithm to extend the structure to modélize a four-way power dividers with different configurations. These circuits are reciprocal devices, they can also be used like power combiners to combine the power when used in reverse. It is shown that the proposed power dividers with different configurations has good performances in terms of return loss, insertion loss and amplitudes, the return loss reveals better than –34 dB at 16 GHz for the 2-way divider, and –40 dB for the 4- way Power Divider at 12.5 GHz with a minimum insertion loss. The proposed power Dividers/Combiners has potential application in microwave system, that are well suited for wide band communication systems. |
| Authors: | Mustapha Bouayad, Lotfi Merad |
| Submitted On: | 18/2/2018 |
| Pages: | 377-385 |
| Action: | [Full Paper]
No. of Downloads: 103 |
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| Manuscript Title: | Investigation on Radiation Characteristics of µ- Negative Material Array Loaded Planar Resonator |
| Manuscript Id: | IJMOT-2018-3-1513 |
| Abstract: | In this article, a radiation characteristic of µ-negative material loaded planar microstrip resonator is examined. This antenna resonates at 3.5 GHz and 5.8 GHz frequencies with return loss of 38.12 dB and 15.83dB respectively. The substrate dimension of proposed resonator is 0.505? x 0.6? at lower frequency and 0.84? x 1.0? at higher frequency. An engineered partial ground plane is utilized to improve impedance bandwidth of the resonator. The design incorporates homogenous square shaped Split Ring Resonator (SRR) array, which possesses µ-negative characteristics, are loaded on the back side of planar resonator. Enhancement of gain at antenna bore sight and radiation efficiency of antenna is achieved using Split Ring Resonators. A cost effective FR-4 substrate has been selected for design. The resonator prototype has been fabricated and measured results are presented. Measured results have good agreement with simulated results. The proposed design presents optimized dimensions for target resonance frequencies for fair value of bandwidth and gain compared to other antennas proposed in literature. |
| Authors: | Upesh Patel, Trushit Upadhyaya |
| Submitted On: | 14/3/2018 |
| Pages: | 386-392 |
| Action: | [Full Paper]
No. of Downloads: 38 |
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| Manuscript Title: | A Dual Band Patch Antenna for Bluetooth and Wireless Local Area Networks Applications |
| Manuscript Id: | IJMOT-2018-4-1537 |
| Abstract: | In this article, the design and development of a novel rectangular patch antenna for dual band applications that operates at 2.4 GHz and 5.8 GHz is presented. The dual band antenna consists of a rectangular patch which is fed by the coaxial probe feeding technique. The ground plane is loaded with two rectangular strip slots and one elliptical slot to drive the antenna into dual mode and to enhance its bandwidth. The proposed antenna is designed and simulated using CST microwave studio software. The antenna with optimized dimensions is fabricated and measured. The various antenna parameters such as the return loss, gain, directivity, E-plane and H-plane radiation patterns etc are presented and discussed. The return loss plot of the dual band antenna both in simulation and in measurement conforms the dual band characteristics. The size of the proposed dual band antenna is compact and suitable for compact wireless devices. The antenna is low cost and provides high gain and high directivity. The maximum gain and maximum directivity of the proposed antenna are 7.398 dB and 7.923 dBi, respectively. The proposed antenna is designed using transmission line model and is suitable for use in the Bluetooth and wireless local area networks (WLANs) applications. |
| Authors: | M. Mabaso, P. Kumar |
| Submitted On: | 10/4/2018 |
| Pages: | 393-400 |
| Action: | [Full Paper]
No. of Downloads: 99 |
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| Manuscript Title: | Design and Analysis of Periodic Split Ring Resonator Array Inspired Defected Ground Plane Antenna |
| Manuscript Id: | IJMOT-2018-4-1549 |
| Abstract: | In this paper, a radiation characteristic of µ-negative material inspired defected ground plane microstrip antenna is examined. Defected ground plane structure (DGS) is the prominent technique to improve bandwidth and gain of the antenna whereas negative refractive index materials have shown extraordinary electromagnetic properties. The overall size of proposed antenna is kept fixed, while homogenous array of split ring resonators are implemented as defected ground structures. The antenna size is 51mm x 43mm which makes it electrically compact being operated in IEEE S-band. Standard low loss FR-4 laminates of 1.6 mm thickness were used for the design. The antenna resonates at multiple frequencies in IEEE S-band and it can be utilized for specific wireless applications, however, key important focus of the paper is to analyze the antenna radiation properties for varied periodic defects in ground plane. The resonance modes, impedance bandwidth and gain are presented in the paper. Antennas were fabricated to verify the simulated results which show good agreement with measured results. |
| Authors: | Upesh Patel, Trushit Upadhyaya |
| Submitted On: | 19/4/2018 |
| Pages: | 401-407 |
| Action: | [Full Paper]
No. of Downloads: 52 |
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| Manuscript Title: | A Novel Coplanar Waveguide Antenna with a Circular Sierpinski Radiating Patch for UWB Applications |
| Manuscript Id: | IJMOT-2018-4-1554 |
| Abstract: | This paper presents an achieved coplanar waveguide (CPW) antenna by using two electromagnetic solvers which are CST of Microwave Studio and ADS of Agilent. The radiating patch of the proposed structure has been chosen circular with a fractal geometry obtained by etching the radiator three times by triangle shapes with different sizes. The feed line with the ground planes are in the top side of the substrate and the printed antenna has been designed to be matched at 50_ in term of input impedance. The overall dimensions of the proposed antenna is 34 x 43 mm2, the substrate is an Epoxy FR4 with a relative dielectric permittivity of 4.4, loss tangent of 0.025, a thickness of 1.6mm and a metallic thickness of 35µm. The CPW antenna has been manufactured by using the photolithographic method in order to perform the measurement of the coefficient of reflection with the Vector Network Analyzer and the Radiation Pattern in the Anechoic chamber. |
| Authors: | Akram El Hamdouni, Abdelali Tajmouati, Jamal Zbitou, Ahmed Errkik, Mohamed Latrach,\r\nLarbi Abdellaoui |
| Submitted On: | 22/4/2018 |
| Pages: | 408-414 |
| Action: | [Full Paper]
No. of Downloads: 58 |
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| Manuscript Title: | A Reconfigurable Compact Size Fractal Antenna for UWB RF Energy Harvesting |
| Manuscript Id: | IJMOT-2018-4-1557 |
| Abstract: | A unique fractal printed patch antenna with defected EBG structured ground is presented for UWB reconfigurable applications. The antenna structure is modeled with influencing properties of fractal structure in association with dominating modes of ground deformities. This association is being observed for electromagnetic band gap patterns. This enables antenna to resonate in to the more eigen mode of excitations. In primary concern, designed structure has a very small dimension 18x21x1.6 mm3 and it is printed on commercially available FR4 substrate with dielectric constant 4.4 and thickness 1.6 mm. The designed structure is found resonating in wide range of frequency from 2.0 to 9.67 GHz. for suitable application of wireless Bluetooth communication (2.4 GHz), Wi-MAX (3.5/5.5 GHz), WLAN (5.2/5.8 GHz) and ISM (5.725/5.82 GHz). The antenna geometry is modeled and simulated on High Frequency Structure Simulator; the simulation results provide sustainable outcomes for the design validation of proposed structure. This paper gives prodigious explanation to the basic modeling and fabrication of the proposed structure. The return loss, VSWR parameters and radiation patterns are measured to make antenna feasible for reconfiguration over UWB applications. This helps antenna for an additional prominent feature of RF energy harvesting. |
| Authors: | Pankaj Kumar Goswami, Garima Goswami, Sudhir Kr. Sharma |
| Submitted On: | 24/4/2018 |
| Pages: | 415-423 |
| Action: | [Full Paper]
No. of Downloads: 67 |
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| Manuscript Title: | An Accurate UWB Technique for Breast Cancer Detection using Microwave Specific Absorption Rate |
| Manuscript Id: | IJMOT-2018-5-1573 |
| Abstract: | A microwave technology is the most safety and accuracy method for breast cancer detection in the early stages. This paper proposes a novel method for detecting and locating a tumour by measuring the energy absorbed in normal tissue and malignant tissue. This method is based on the conception of an UWB biomedical system, especially an UWB microstrip antenna, which plays an important part in determining the system performances. In this contribution we proved the feasibility of detecting small breast tumours using SAR technique with high precision and efficiency. |
| Authors: | Nirmine Hammouch, Hassan Ammor |
| Submitted On: | 21/5/2018 |
| Pages: | 424-431 |
| Action: | [Full Paper]
No. of Downloads: 70 |
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