VOL.6, NO.5, SEPTEMBER 2011

A PUBLICATION OF ISRAMT, Electrical Engineering Department,
University of Nevada, Reno, NV 89557, USA.
SEPTEMBER 2011        VOLUME 6       NUMBER 5        IJMOT     ISSN: 1553-0396
Banmali S Rawat
Manuscript Title:On the Design of CPW-Feed Pentagonal-Cut UWB Fractal Antenna
Manuscript Id:IJMOT-2011-2-69
Abstract:The article presents the CPW-feed ultra wideband pentagonal cut fractal antenna. This planar monopole antenna has been design on low cost FR4 substrate of ɛr = 4.3 and thickness h=1.53mm. The proposed antenna has been fabricated with optimized dimension. The experimental result of this antenna exhibits the ultra wideband from 4.69 GHz to 15 GHz. The antenna has been simulated with the commercial software based on Finite Element method. The experimental and simulated results are in good agreement. The effects of various design parameters on impedance bandwidth have also been studied in detail. The nature of H and E – plane radiation patterns are omni directional and figure of eight respectively. The group delay, phase and power spectrum are also studied. This antenna can be useful for UWB system, Microwave Imaging and vehicular radar.
Authors:Raj Kumar and Prem Narayana Choubey
Submitted On:2/3/2011
[Full Paper]    No. of Downloads: 19

Manuscript Title:Multipactor Analysis in Coaxial RF Window for Space TWT
Manuscript Id:IJMOT-2011-2-70
Abstract:In this paper multipactor analysis of coaxial RF window has been carried out for a space TWT. A reliable model for multipactor analysis and power handling evaluation in co-axial waveguide and cylindrical waveguide has been developed. This paper describes the physical conditions that give rise to the multipactor failure mechanism, with special emphasis on power levels, frequency ranges, and gap widths likely to cause multipactor. We describe a procedure, based on the analytical model, for calculating the multipactor margin in coaxial RF window. Based on the calculation with real worst case assumptions and model showing more than 200 W allowed power. The techniques used to overcome multipaction are presented by this analysis.
Authors:MK Alaria,KS Parikh,AK Sinha and V Srivastava
Submitted On:2/11/2011
[Full Paper]    No. of Downloads: 23

Manuscript Title:A Common Neural Approach for Computing Different Parameters of Circular Patch Microstrip Antennas
Manuscript Id:IJMOT-2011-2-86
Abstract:This paper presents a single feed forward neural model for calculating the resonant frequency and radius of a circular patch. For calculating these two parameters, the proposed model is trained by Levenberg-Marquardt algorithm with the data sets of resonant frequency and radius simultaneously. The model has also been validated on some analytically generated data sets that are not included in training or testing of the neural model. The results obtained in the calculation of these two parameters from a common neural model are in conformity with the experimental results obtained by the conventional approaches.
Authors:Taimoor Khan and Asok De
Submitted On:2/22/2011
[Full Paper]    No. of Downloads: 13

Manuscript Title:Analysis of Circular Disk Patch Antenna Loaded with U- and V-shape slot for Broadband Operation
Manuscript Id:IJMOT-2011-3-91
Abstract:A broadband antenna is achieved by introducing two different shapes of slot in circular disk patch. In U- slot loaded disk antenna, typically 24.21 % bandwidth is obtained however in V- slot loaded patch antenna bandwidth improves up to 34.58 %. Variation of slot length (Ls), slot width (T), base length ( Lb) as well as V-arm angle ( ) are also studied to obtain the desired bandwidth and good matching. The theoretical results are also compared with IE3D simulation and experimental results.
Authors:N.P Yadav, J.A Ansari, A Mishra
Submitted On:3/5/2011
[Full Paper]    No. of Downloads: 15

Manuscript Title:Analysis of Various Parameter of Square Notch Patch Antenna Using Energy Band Gap and Defected Ground Structure
Manuscript Id:IJMOT-2011-3-103
Abstract:This paper presents comparison of various parameter of square notch patch antenna using energy band gap and defected ground structure and to optimize the performance of the final design. EBG method utilizes the inherent properties of dielectric materials to enhance the performance of microstrip antenna. DGS is an etched periodic or non-periodic cascaded configuration defect in ground of a planar transmission line which disturbs the shield current distribution in the ground plane cause of the defect in the ground. The theoretical performances are carried out using HFSS software. The proposed antenna is circularly polarized and operates at 4 to 6 GHz frequency band. Square notch patch antenna with energy band gap structure is having better radiation characteristics with return loss of -19.31db at resonant frequency of 4.64 GHz and having the gain of 11db and the directivity of 10db. Defected ground structure antenna is having 18-20% bandwidth greater than the EBG structure antenna and al
Authors:A.Sahaya Anselin nisha, T.Jayanthy
Submitted On:3/28/2011
[Full Paper]    No. of Downloads: 14

Manuscript Title:A Miniaturized Ultra Wideband Slot Antenna with Band Notched Characteristic
Manuscript Id:IJMOT-2011-6-185
Abstract:A Compact planar slot antenna is proposed and developed for Ultra Wideband Applications. The antenna has compact size of 28 x 31 x 0.8 mm3. The antenna is fabricated with FR4 substrate and it is fed by Coplanar Wave Guide. The antenna is investigated experimentally to obtain required return loss, gain and radiation pattern characteristics. The antenna operates over a band between 3.1 GHz and 11 GHz for return loss < -10 dB, removing the undesired band of 5.1- 5.85 GHz to avoid interference with WLAN and HIPERLAN/2. The design and analysis of the proposed antenna is made on the method of moments based IE3D Electro magnetic solver. The antenna has stable Omni directional pattern in E-plane and bi-directional radiation pattern in H-plane. The group delay of the antenna is less than 1 ns in operating bandwidth.
Authors:Akkala Subbarao, Dr.S. Raghavan
Submitted On:6/9/2011
[Full Paper]    No. of Downloads: 10

Manuscript Title:New Design Approach for Concurrent Dual-Band Low Noise Amplifiers
Manuscript Id:IJMOT-2011-7-196
Abstract:This paper presents a class of lumped element networks, which permit to synthesize impedance values at two frequencies. For each network, in order to infer the related synthesis formulae, mathematical expressions are provided, and for some topologies, the necessary feasibility conditions are defined. Moreover, to stress the usefulness of the presented topologies, a dual-band low noise amplifier is designed utilizing such networks, and the resulting amplifier performances are reported and compared.
Authors:Walter Ciccognani, Ernesto Limiti, Lucio Scucchia
Submitted On:7/12/2011
[Full Paper]    No. of Downloads: 9

Manuscript Title:Accurate Model for Single Bow-Tie Antenna Design
Manuscript Id:IJMOT-2011-2-72
Abstract:In this paper we propose a simple equivalent and accurate model for bow-tie single antenna modeling. This model uses the resistance of a square element that appears at the edges of the antenna (radiating slots). To test this model, two antennas were simulated and results were compared with those obtained by a rigorous method (moment’s method) of the simulator ADS/Momentum. The results confirm the validity of the proposed model
Authors:M. ABRI, H. DIB and A. S. E. GHARNAOUT
Submitted On:2/11/2011
[Full Paper]    No. of Downloads: 22

Manuscript Title:Optical RF Phase Shifter Design Employing Optical Phase Manipulation and Coherent Detection – Part I: Concept Proposal
Manuscript Id:IJMOT-2011-8-219
Abstract:An optical radio-frequency (RF) phase
Authors:Linh V. T. Nguyen
Submitted On:8/18/2011
[Full Paper]    No. of Downloads: 9

Manuscript Title:Optical RF Phase Shifter Design Employing Optical Phase Manipulation and Coherent Detection – Part II: Numerical Demonstration
Manuscript Id:IJMOT-2011-8-2191
Abstract:An optical radio-frequency (RF) phase shifter concept employing optical phase manipulation of a double-sideband (DSB) modulated optical signal and coherent detection has been previously proposed in Part I. In this paper, an industry-standard photonic simulator is utilized to numerically demonstrate this optical RF phase shifter concept and investigate its performance. Linear phase responses are successfully demonstrated over a frequency range of 10-50 GHz. Various noise artifacts inherent in the design are identified. A number of design trade-offs are investigated and discussed. A possible feed-forward solution to suppress common-mode low-frequency noise and secondorder harmonic artifacts is simulated.
Authors:Linh V. T. Nguyen
Submitted On:9/22/2011
[Full Paper]    No. of Downloads: 7

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