| Section A: Microwave Technology and Related Topics |
| Manuscript Title: A Modified Transmission-Line Model for Analyzing a Bow-Tie Microstrip Patch Antenna |
| Manuscript Id: IJMOT-2008-10-401 |
| Abstract: A more accurate and numerically efficient Transmission Line model is proposed for a bow-tie microstrip patch antenna to include the effect of flare angle of nonradiating edges on the antenna characteristics. A comparison between MoM, Moussakhani Transmission Line model and proposed Transmission Line model show that the results of VSWR, return loss and resonant frequency obtained from the proposed model has a better agreement with results obtained by Advance Design System which uses MoM even for large range of flare angles compared to Moussakhani Transmission Line model. |
| Authors: Pradyot Kala, Reena Pant |
Category: Microwave Technology Submitted On: 1/4/2009 Full Text [PDF] Pg.Nos: 263-269
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| Manuscript Title: Rectangular Microstrip Array Antenna on Biased Polycrystalline Ferrite Substrate as Signal to Noise Enhancer |
| Manuscript Id: IJMOT-2008-10-402 |
| Abstract: This document describe a rectangular microstrip array printed on synthesized LiTi ferrite, work as a signal to noise enhancer in X-band of microwave frequency. This array antenna consists of 16 rectangular patches and magnetically biased externally. This array has been designed on substituted LiTi ferrite substrate which works on the principle of inverse dynamic nonlinearity of Magnetostatic waves in ferrite substrates. The calculated electric and magnetic properties are also presented which shows the significance of substitution for the tunability of antenna. The proposed antenna structure is suitable for mobile communication system. |
| Authors: Naveen Kumar Saxena, Nitendar Kumar, and P.K.S. Pourush |
Category: Microwave Technology Submitted On: 10/9/2008 Full Text [PDF] Pg.Nos: 270-275
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| Manuscript Title: Novel Design of Compact Low Pass Filter using Defected Ground Structure |
| Manuscript Id: IJMOT-2008-12-411 |
| Abstract: Abstract-This paper presents a novel design method of compact low pass filter using defected ground structure (DGS). The proposed design method is then applied to design five pole low pass filters (LPF) with Chebyshev response for 1GHz and 2.5 GHz cut off frequencies. This design method is useful to design low pass filters using defected ground structure for desired cut off frequency. The proposed design gives simple structure, small size (50% of a conventional LPF), less discontinuities, without high impedance lines, and high power handling capabilities are obtained through the proposed filters. |
| Authors: Ashwani Kumar, A.K.Verma |
Category: Microwave Technology Submitted On: 12/9/2008 Full Text [PDF] Pg.Nos: 276-282
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| Manuscript Title: Design, analysis and Related Applications of Shunt Varactor Loaded Reconfigurable Metamaterial Transmission Line |
| Manuscript Id: IJMOT-2008-12-414 |
| Abstract: The unit cell of the traditional metamaterial line is modified by including an additional shunt capacitor loading. The extra shunt capacitor gives a better control over the band-pass response of the periodic structure and also provides a way to tune the frequency response of the line in the desired operating range. Design equations are developed to synthesize a generalized metamaterial line with arbitrary impedance, phase, and band-pass response characteristics. To illustrate the concept, two compact reconfigurable microwave devices including a Wilkinson power divider with a tunable band-pass response and a tunable phase shifter were designed and fabricated |
| Authors: Omar F. Siddiqui, Ashraf S. Mohra, and Majeed A. Alkanhal |
Category: Microwave Technology Submitted On: 12/29/2008 Full Text [PDF] Pg.Nos: 283-292
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| Manuscript Title: Impedance and Loss Analysis of Cu Interconnections on Non Conventional Dielectrics for High Frequency VLSI Application |
| Manuscript Id: IJMOT-2009-1-423 |
| Abstract: VLSI interconnections for microwave frequency range of operation are analyzed for low resistivity metallic Cu deposited on composite dielectric formed by a thin layer of Si3N4 and SiO2 on Si substrate. The problem is formulated by considering it as a boundary value problem in terms of hybrid mode representation. To find characteristic impedance, conductor loss and dielectric loss of the interconnections, the resulting equations are transferred to spectral domain by using Fourier transform. Conductor loss and dielectric loss are calculated up to 20 GHz for different doping concentrations of Si substrate using Spectral Domain Galerkin’s technique. Conductor losses are also calculated against the variation of interconnect width. |
| Authors: M G Tiary, Bhaskar Gupta and A K Aditya |
Category: Microwave Technology Submitted On: 1/29/2009 Full Text [PDF] Pg.Nos: 293-301
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| Manuscript Title: An Optimal Design of Compact CPW-Fed Slot Antenna for Broadband Applications |
| Manuscript Id: IJMOT-2009-3-434 |
| Abstract: A compact coplanar waveguide(CPW) fed slot antenna is developed and presented,in this paper.The proposed antenna has a simple structure consisting of rectangular slot,semicircular feeding structure and notch in the ground plane.The introduction of notch in the ground plane improves the impedance bandwidth and matching.The analysis of the designed structure is investigated using MoM based electromagnetic solver, IE3D.The designed antenna is fabricated using FR4 substrate with 1.6mm thickness.The returnloss and VSWR of the developed antenna are measured, compared with the simulated results and are found to be almost similar.The overall dimension of the antenna comes around 19×20×1.6mm3 and the impedance bandwidth of the antenna is about 69% with return loss better than -10 dB over the frequency range of 5GHz to 10.3GHz.It is also shown that the proposed antenna has relatively stable omni directional radiation pattern in the H-plane and bidirectional radiation pattern in the E-plane. |
| Authors: J William and R Nakkeeran |
Category: Microwave Technology Submitted On: 3/30/2009 Full Text [PDF] Pg.Nos: 302-308
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| Manuscript Title: Thermal and Structural Analysis of Electron Gun Assembly for a C-band 60W Space TWT |
| Manuscript Id: IJMOT-2009-6-442 |
| Abstract: Thermal and structural analysis of the electron gun assembly for an in-house designed C-band 60W space Traveling Wave Tube (TWT) has been carried out for optimizing the design of cathode support structure and cathode heat shield. M-type tungsten dispenser cathode of disc diameter 3.20mm has been used. Thermally efficient cathode support structure with heat shield has been designed in order to achieve the required cathode operating brightness temperature (~ 9500CB) at heater power around 3.5W. Dimensional deformations in the gun assembly due to thermal expansion of various parts of the cathode assembly have been estimated under hot operating conditions. Also, cathode support assembly and heat shield have been designed for their lowest modal frequency more than 1000 Hz, as specified for the space application. Performance of the gun assembly, designed and developed with due considerations for thermal and structural requirements, has been evaluated experimentally. This paper presents thermal and structural analysis of the electron gun assembly for the C-band 60W space TWT. |
| Authors: RK Sharma, A Bera and V Srivastava |
Category: Microwave Technology Submitted On: 6/9/2009 Full Text [PDF] Pg.Nos: 309-314
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| Manuscript Title: Effect of Air Gap width on the Performance of a Stacked
Square Electronic Band Gap Antenna |
| Manuscript Id: IJMOT-2009-6-443 |
| Abstract: A Stacked Square Microstrip Antennawith shorting post is designed which is backed withelectromagnetic band gap (EBG) structure on theother side of the substrate, acting as ground plane.One such EBGMSA is discussed with square holesin the ground plane. A reflector plane is used at adistance of 8.5mm. The air gap between thisreflector and EBG ground plane is varied and itseffect on the antenna parameters is studied. |
| Authors: N. S. Raghava, Asok De |
Category: Microwave Technology Submitted On: 6/9/2009 Full Text [PDF] Pg.Nos: 315-317
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| Section B: Optical Technology and Related Topics |
| Manuscript Title: Spectroscopy Properties of Epoxy Novolak Resin Doped with Rare Earth Ions |
| Manuscript Id: IJMOT-2008-9-388 |
| Abstract: In this paper we report about new spectroscopy properties of rare earth doped epoxy novolak resin polymer. The polymer samples were doped with rare earths like praseodymium, neodymium, samarium, europium or dysprosium. The samples were fabricated by spin coating on silicon substrates or by pouring the polymers containing the rare earth into bottomless molds placed on quartz substrates. Infrared spectroscopy was used for checking the presence of the O-H stretching vibration in the samples and how they were subsequently affected by various concentrations of the doping rare earth salts. Typical bands corresponding to the rare earth ions in the region from 350 nm to 2900 nm of the absorption spectra were studied in order to find optimal concentrations of the particular dopants. |
| Authors: Vaclav Prajzler, Ivan Huttel, Oleksiy Lyutakov, Jarmila Spirkova, Vladimir Machovic, Jiri Oswald, Vitezslav Jerabek |
Topic: Optical Technology Submitted On: 9/3/2008 Full Text [PDF] Pg.Nos: 318-323
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| Manuscript Title: Ultrahigh Birefringent Photonic Crystal Fiber- An Improved Design |
| Manuscript Id: IJMOT-2008-9-391 |
| Abstract: An improved design of Photonic Crystal Fiber with extremely high birefringence and ultralow confinement loss is proposed and analyzed by full- vector finite-element method with uniaxial perfectly matched layers. Numerical results confirm that the proposed structure provides extremely high birefringence (~0.022) and ultralow confinement loss (<0.001dB/km). |
| Authors: Anshu D Varshney and R.K.Sinha |
Topic: Optical Technology Submitted On: 9/10/2008 Full Text [PDF] Pg.Nos: 324-327
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