| Section A: Microwave Technology and Related Topics |
| Manuscript Title: A CAD Neural Model for Quasi – Static Analysis of CPW Synthesis |
| Manuscript Id: IJMOT-2008-2-293 |
| Abstract: In recent years, Computer – Aided Design (CAD) approach based on ANN has been introduced to microwave modeling, simulation & optimization. In this work, closed form synthesis formulae (quasi static analysis) for Coplanar Waveguides (CPWs) have been analyzed with the use of ANN Models. The neural models were trained with Levenberg – Marquardt (LM) learning algorithm and that was found to be the best algorithm among all. This conclusion is inferred from the error calculation of four methods. A comprehensive comparison has been made with the Quasi – Static results. This has facilitated the usage of ANN models. The notable benefits are simplicity & accurate determination of the characteristic parameters of CPW’s. The greatest advantage is lengthy formulas can be dispensed with. |
| Authors: P. Thiruvalar selvan, S. Raghavan and S. Suganthi |
Category: Microwave Technology Submitted On: 10/2/2008 Full Text [PDF] Pg.Nos: 1-8
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| Manuscript Title: Analysis of an Electromagnetically Coupled Stacked Cylindrical-Rectangular Microstrip Patch Antenna |
| Manuscript Id: IJMOT-2008-5-305 |
| Abstract: Detail theoretical formulation and results for an electromagnetically coupled stacked rectangular-cylindrical microstrip patch antenna have been presented. Theory of input impedance is based on cavity model while its radiation pattern is derived on the basis of aperture model. Resonant frequency, bandwidth, VSWR and radiation pattern of the structure have been studied. The results are found in good agreement with experimental results. A large bandwidth is found when the dielectric material is separated by air gap spacing. |
| Authors: Pradyot Kala, Reena Pant, S. S. Pattnaik, R. C. Saraswat |
Category: Microwave Technology Submitted On: 12/29/2008 Full Text [PDF] Pg.Nos: 9-17
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| Manuscript Title: Wall loss and thermal analysis of 200kW (CW), 42GHz Gyrotron cavity |
| Manuscript Id: IJMOT-2008-7-330 |
| Abstract: Abstract - Gyro-devices like Gyrotrons are used in the TOKAMAK system for plasma heating. Hence thermal temperature distribution of Gyrotron is so important. Mainly the Magnetron Injection Gun (MIG), interaction cavity and collector deals with high thermal loading. The operating mode of 200kW CW, 42GHz Gyrotron is TE0,3 . Thermal analysis of this Gyrotron cavity has been carried out using ANSYS software and discussed in the paper. Heat generated at inner cavity wall due to cavity Ohomic wall loss has been cooled using liquid turbulent flow at 290K. Water has been used as coolant liquid for cooling purposes. After cooling of the cavity, thermal distributions along with cavity structure are shown. Calculated wall loss at the cavity wall is less than critical limit i.e. less than 1x104 kW/m2. Cooling arrangement of this cavity has been suggested with fins on the outer surface of the cavity.
Index Terms - Cooling arrangement, gyro-device gyrotron, ohmic wall loss, thermal analysis. |
| Authors: Jyotirmoy Koner and A K Sinha |
Category: Microwave Technology Submitted On: 10/20/2008 Full Text [PDF] Pg.Nos: 18-20
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| Manuscript Title: Design of Compact Coplanar Waveguide Fed Slot Antenna for RFID Applications |
| Manuscript Id: IJMOT-2008-6-326 |
| Abstract: Abstract:- In this paper analysis and design of
compact capacitive fed Coplanar waveguide slot
antenna is proposed for RFID applications.
Antenna is fabricated using FR4 substrate with
dielectric constant of 4.4. The fundamental
parameters of the antenna such as bandwidth,
return loss, gain, radiation pattern and
polarization are obtained. All meets the acceptable
antenna standards. Simulation tool, based on the
method of moments (ZELAND IE3D version 12.0)
has been used to analyze and optimize the antenna
and inductive fed Coplanar Waveguide slot
antenna also discussed. |
| Authors: T.Shanmuganantham, S.Raghavan |
Category: Microwave Technology Submitted On: 9/14/2008 Full Text [PDF] Pg.Nos: 21-26
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| Manuscript Title: Modeling of Wave Penetration through Cylindrical Aperture Using WCIP Method |
| Manuscript Id: IJMOT-2008-8-381 |
| Abstract: Abstract- The coupling of electromagnetic (EM)
wave through multilayered cylindrical apertures is
analyzed by a transverse wave method called Wave
Concept Iterative Process (WCIP).Diffraction
operators describing the coupling between the
studied structure and the free space are defined
and expanded in a cylindrical modal basis
functions. The iterative process is generated by two
equations defined in the spatial domain .The
efficiency and accuracy of the proposed technique
are validated by illustrative examples in both TE
and TM polarizations. |
| Authors: Noemen Ammar, Taoufik Aguili and Henri Baudrand |
Category: Microwave Technology Submitted On: 9/25/2008 Full Text [PDF] Pg.Nos: 27-34
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| Manuscript Title: SAR Analysis in a Spherical Inhomogeneous Human Head Model Exposed to Radiating Dipole Antenna for 500 MHz – 3 GHz Using FDTD method |
| Manuscript Id: IJMOT-2008-10-404 |
| Abstract: Analysis of specific absorption rate (SAR) generated by half wave radiating dipole antenna inside a spherical inhomogeneous human head model at the frequency range 500 MHz to 3 GHz using finite difference in time domain (FDTD) method is presented in this paper. The human head is modeled as an inhomogeneous sphere of 19 cm diameter consisting of a uniform core representing human brain, surrounded by two spherical shells representing skull and skin with their respective electromagnetic properties. Maximum local SARs are obtained for the distance between head and antenna in the range of 1.0 cm to 3.0 cm using a dipole antenna of length 14.5 cm. As the distance is increased over 1.0 cm then the value of maximum local SAR induced in the head goes below FCC and IEEE’s upper safety limit for input power of 0.6 Watt. Resonant dipole antennas of appropriate length corresponding to several spot frequencies have also been used to observe the maximum local SARs at their resonance frequencies. |
| Authors: Md Faruk Ali, Sudhabindu Ray |
Category: Microwave Technology Submitted On: 10/24/2008 Full Text [PDF] Pg.Nos: 35-40
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| Manuscript Title: Harmonic Suppressed Reduced Size Koch Fractal Hybrid Coupler for WLAN Wireless Applications Using Complimentary Split Ring Resonators |
| Manuscript Id: IJMOT-2008-9-398 |
| Abstract: Abstract— In this paper a new harmonic suppressed reduced size Koch fractal hybrid coupler is proposed using Complimentary Split Ring Resonators (CSRR). In order to validate the results, CSRR Koch fractal hybrid coupler is designed, fabricated and measured using Microstrip transmission line at operating frequency 2.44 GHz. Also CSRR Koch fractal hybrid coupler results are compared with the conventional Koch fractal hybrid coupler. The measured results verify the 173.25o phase difference between two output ports. Also it has effectively improved the coupling loss and isolation. Further more 3rd order harmonics of operating frequency is suppressed by adding CSRR on the ground plane of the Koch fractal hybrid coupler. Experimental results shows good consistent with the simulation results. This CSRR Koch fractal hybrid coupler can be used for WLAN wireless applications. |
| Authors: K.Annaram, Dr.S.Raju ; Dr.V.Abhaikumar |
Category: Microwave Technology Submitted On: 9/24/2008 Full Text [PDF] Pg.Nos: 41-46
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| Manuscript Title: A Novel Technique for the Temperature Dependent Studies of Materials Using a Microwave Resonant Cavity |
| Manuscript Id: IJMOT-2008-10-399 |
| Abstract: This study presents a linearization technique for transducers by using software solutions programmed into a microcontroller. Existing data acquisition systems linearize nonlinear transducer characteristics in real time using analog linearizing circuitry, which are susceptible to errors due fluctuations in power supply voltage, temperature, and interference from correlated and uncorrelated noise sources in the system. The goal of this work is to replace analog hardware techniques for linearization using software solutions provided by microcontrollers, which also has inherent capabilities for performing signal conditioning and data acquisition among others. The methodology for linearization is the piecewise-linear software approximation technique using the one-sixth and five-sixth operating points on each segment, and results show an improvement over the end point approximations. This technique is successfully used in an existing microcontroller to monitor the temperature of a microwave resonant cavity. The resonant cavity is used to study the microwave dielectric response of different materials as a function of temperature and frequency. |
| Authors: R. Athinarayanan, J. N. Dahiya, A. Anand, J.A. Roberts |
Category: Microwave Technology Submitted On: 10/2/2008 Full Text [PDF] Pg.Nos: 47-51
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| Section B: Optical Technology and Related Topics |
| Manuscript Title: Optical MEMS Based Signal Processor for smart antenna in Mobile broad-band communications |
| Manuscript Id: IJMOT-2008-7-335 |
| Abstract: Design and simulation of a MEMS based
Optical Signal Processing Beam former for cellular
network base station is reported in this paper. The
optical signal destined for a mobile terminal is split
into eight equal-intensity signals .Each signal is
complex weighted by controlling the phase and
amplitude using a pair of micromirrors driven by
electrostatic comb drive actuators. The processed
optical signal is heterodyned with phase locked
local optical signal .The resulting weighted
microwave signal is then fed to the corresponding
element of the 1x 8 antenna array. The complex
weights are computed using Maximum Directivity
(MD) algorithm for specified directions of arrival
of signals and interferences. The radiation patterns
of the proposed multi beam forming network were
simulated using MATLAB & SIMULINK for
different sets of look directions and null directions.
The beam steering was found to be satisfactory in a
120 degree sector. |
| Authors: A.P. Kabilan, P. Elizabeth Caroline , X. Susan Christina |
Topic: Optical Technology Submitted On: 7/15/2008 Full Text [PDF] Pg.Nos: 52-59
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| Manuscript Title: High Performance Optical Networks – An Overview |
| Manuscript Id: IJMOT-2007-11-281 |
| Abstract: Traditional ring- or star-based metro networks are costly to scale up to high speed and cannot recover from multiple failures, while backbone solutions are too expensive to fit into the cost-sensitive metro market. This paper proposes a high performance optical network architecture for metro networks to provide high-performance node-to-node all-optical transportation. The architecture emulates a fully connected network by providing optical channels between node pairs without intermediate buffering, and thus realizes single-hop transportation and avoids expensive packet routers. |
| Authors: KVSSSS SAIRAM, Dr. TJ RAO , Dr. P.V.D. SOMASEKHAR RAO |
Topic: Optical Technology Submitted On: 11/29/2007 Full Text [PDF] Pg.Nos: 60-66
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