| Section A: Microwave Technology and Related Topics |
| Manuscript Title: A Stacked Structure Broadband Circular Polarization Microstrip S-Ring Antenna |
| Manuscript Id: IJMOT-2006-8-207 |
| Abstract: A single-feed S-Ring Antenna (SRA) by stacked substrate structure for circularly polarized application was studied in this paper. The antenna is designed for Left-Hand Circular Polarization (LHCP) at a center frequency of 2.1GHz. The design of the proposed antenna is aimed at obtaining wider bandwidth and better circular polarization (CP) Axial-Ratio (AR) for Global Positioning System (GPS) applications. By a mixed stacked different dielectric substrate structure to enhance the bandwidths of the impedances and other characteristics such as including AR bandwidth, CP gains and antenna efficiency of the proposed antenna has been compared and analyzed. The experimental results verify that the antenna has an impedance bandwidth (VSWR.≦ 2) of 23.5% and a 3-dB AR bandwidth more than 23%. |
| Authors: Huan-Cheng Lien, Huei-Chiou Tsai |
Category: Microwave Technology Submitted On: 11/4/2006 Full Text [PDF] Pg.Nos: 1-4
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| Manuscript Title: Full-Wave Analysis of a Millimeter Wave Microstrip Junction Circulator |
| Manuscript Id: IJMOT-2006-7-205 |
| Abstract: In this paper millimeter wave microstrip junction circulator is analyzed by a full wave method, which combines mode expansion and finite element method (FEM) based on Helmholtz equation weak form. The scattering parameters of the circulator calculated are presented and compared with that of experiments, and agreement has been found. The loss of the microstrip substrate and ferrite disk is also analyzed. For the first time, the electric field distribution in the ferrite disk is calculated to depict the circulating process of the microstrip junction circulator. |
| Authors: F Yang, H C Wu, W B Dou |
Category: Microwave Technology Submitted On: 7/29/2006 Full Text [PDF] Pg.Nos: 5-13
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| Manuscript Title: Simple Technique for a Quick Evaluation of HBT Temperature-Dependant DC Model Parameters in Forward Active Regime |
| Manuscript Id: IJMOT-2006-8-208 |
| Abstract: This paper presents a simple parameter-extraction technique for an HBT temperature-dependant equivalent-circuit DC model, in the forward active regime. The proposed approach is characterized by its ease of implementation. It was applied to predict the DC characteristics of a 1x10 μm2 emitter-area InGaP/GaAs HBT device. |
| Authors: Louay Degachi, Fadhel M. Ghannouchi |
Category: Microwave Technology Submitted On: 8/10/2006 Full Text [PDF] Pg.Nos: 14-17
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| Manuscript Title: Analysis of Frequency Behavior of Microstrip Lines on Anisotropic Substrates with Slots in Ground Plane |
| Manuscript Id: IJMOT-2006-8-209 |
| Abstract: This paper analyzes the effects on the frequency behavior of the microstrip lines with defected ground plane structures (DGS) on anisotropic substrates. An improvement in the losses at attenuation poles and sharpness factor of LPF based on DGS on anisotropic substrates has been reported.
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| Authors: Sachin Singh, Banmali S. Rawat |
Category: Microwave Technology Submitted On: 8/11/2006 Full Text [PDF] Pg.Nos: 18-27
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| Manuscript Title: Systematic Extraction Method for the Determination of HBT Temperature-Dependant DC Model Parameters |
| Manuscript Id: IJMOT-2006-8-213 |
| Abstract: This paper presents a systematic parameter extraction method for an HBT temperature-dependant equivalent-circuit DC model. A reliable procedure was developed for determining the HBT thermal resistance, requiring only forward Gummel data at different temperatures and collector-emitter bias voltages. The extraction method was applied to predict the DC characteristics of a 2x25 μm2 emitter-area InGaP/GaAs HBT device. |
| Authors: Sami Bousnina, Louay Degachi, Fadhel M. Ghannouchi |
Category: Microwave Technology Submitted On: 8/24/2006 Full Text [PDF] Pg.Nos: 28-34
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| Manuscript Title: Modal Characteristics of Quadruple-Clad Planar Waveguides with Double Negative Metamaterials |
| Manuscript Id: IJMOT-2006-9-215 |
| Abstract: A theoretical investigation of quadruple-clad dielectric waveguides containing double negative metamaterials but with arbitrary index profiles is presented. Characteristic equations and cutoff conditions for fast-wave and slow-wave modes are derived. This investigation reveals some results with new characteristics not observed in double negative slab waveguides. In particular, it is shown that, unlike double negative slab waveguides in which fast-wave fundamental transverse electric and transverse magnetic modes do not exist, quadruple-clad waveguides containing double negative materials can support these modes. For the case where the inner cladding layers are double negative, the odd and even modes are out of order in a manner not seen in double positive waveguides or even the double negative slab waveguide. Other unique modal characteristics are also observed. |
| Authors: Jeffrey R Clark, Ahmad Safaai-Jazi |
Category: Microwave Technology Submitted On: 9/1/2006 Full Text [PDF] Pg.Nos: 35-44
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| Manuscript Title: A Reflection-Type Vector Modulator with Balanced Loads |
| Manuscript Id: IJMOT-2006-8-206 |
| Abstract: In this contribution a new vector modulator topology is presented. The new VM allows the reduction of the resulting chip area occupation by using 7 couplers only, as contrasted to traditional reflection-type balanced vector modulators with 9 couplers, and exhibiting comparable performance. A W Band test vehicle adopting such new topology has been designed in monolithic form with 0.13 µm pHEMT technology, resulting in a die size 2.2 x 1.5 mm2. The approach to the novel topology and relevant performances of the test vehicle are described in the following. |
| Authors: Franco Di Paolo, Mauro Ferrari, Franco Giannini,Ernesto Limiti |
Category: Microwave Technology Submitted On: 8/8/2006 Full Text [PDF] Pg.Nos: 45-50
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| Manuscript Title: Circular Wavegides On-Periphery Filled with Ultralow-Index Artificial Materials |
| Manuscript Id: IJMOT-2006-9-220 |
| Abstract: Characteristics of TE- and TM-polarized modes in circular waveguides with on-periphery placed coaxial inserts made of ultralow-index artificial material are studied. The emphasis is put on the effect of varying permittivity, permeability and thickness of the insert. It is shown that electromagnetic characteristics can substantially be changed in comparison with a hollow waveguide even in case of a very thin insert. At certain conditions, the transverse wavenumbers corresponding to the different polarizations change their locations with respect to each other. |
| Authors: A E Serebryannikov, A L Teplyuk, and K Schuenemann |
Category: Microwave Technology Submitted On: 9/15/2006 Full Text [PDF] Pg.Nos: 51-57
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| Manuscript Title: Study of the "Sierpinski’s Carpet" fractal planar antenna by the renormalisation method |
| Manuscript Id: IJMOT-2006-9-219 |
| Abstract: We are interested, in this work, with the application of the method of renormalisation in electromagnetism by studying the radiation of fractal planar antennas. Our study relates, more particularly, to the Sierpinski’s Carpet antenna, where we combine the surface impedance model with the renormalisation method to find out very interesting results in particular concerning computing time and memory resources use compared to MoM. This new method, as far as we know, is the only method able to study this type of antennas on infinite scales (or iterations) thanks to the concept of fixed point that guarantees the convergence of the results towards this point when the scale rises indefinitely. |
| Authors: C. LARBI , T. BEN SALAH , T.AGUILI , A.BOUALLEGUE, H.BAUDRAND |
Category: Microwave Technology Submitted On: 9/19/2006 Full Text [PDF] Pg.Nos: 58-65
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| Manuscript Title: A Novel Planar 2-D Unit Structure of Double Negative Material |
| Manuscript Id: IJMOT-2006-9-217 |
| Abstract: Abstract — A novel unit of planar distributed
structure with double negative materials (DNM) is
proposed. The new unit consisted of microstrip
line is of composite structure only on single-layer
but not two layers as did in the literature. The
new structure greatly debases the left-handed
frequency by using inter-digital capacitor instead
of the old mushroom capacitor as well as with
conductive coil as an inductance to the ground
rather than the old conductive cylinder. In
addition, a new method to extract parameters of
the structure is presented. And the equivalent
circuit parameters have been extracted from
full-wave simulation and composite
right/left-handed transmission line (CRLH-TL)
theory. |
| Authors: Tao Lu,Shanjia Xu |
Category: Microwave Technology Submitted On: 9/7/2006 Full Text [PDF] Pg.Nos: 66-72
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| Section B: Optical Technology and Related Topics |
| Manuscript Title: Concatenated Error Control Coding Applied to WDM Optical Communication Systems for Performance Enhancement |
| Manuscript Id: IJMOT-2006-4-5 |
| Abstract: Long haul incoherent optical multichannel communication systems employing N × N Wavelength Division Multiplexing (WDM) in presence of Stimulated Raman Scattering (SRS) and other receiver noises including channel and Amplified Spontaneous Emission (ASE) beat noises is analyzed. Concatenated error control coding techniques are employed to counter system degradation due to these limiting factors. It is shown that the Bit Error Rate (BER) of the order of 10-9 can be achieved for large values of N (=270) at link length of 200km without crossing SRS threshold of 1dB. Also power penalty due to multiplexer crosstalk effectively comes down from 5.5dB to 0.14dB for a 64 channel WDM system. |
| Authors: Mruthyunjaya H.S., Umesh G, M.Sathish Kumar |
Topic: Optical Technology Submitted On: 7/23/2006 Full Text [PDF] Pg.Nos: 73-79
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| Manuscript Title: Extended Transfer Matrix Formalism Applied to Active Mach-Zehnder Interferometers with Built-in Semiconductor Optical Amplifiers |
| Manuscript Id: IJMOT-2006-7-195 |
| Abstract: We use an enlarged (5x5) Transfer Matrix Formalism to describe the linear and nonlinear properties of Mach-Zehnder Interferometers with built-in Semiconductor Optical Amplifiers. The active medium is subject to carrier saturation through both signal and Amplified Spontaneous Emission. |
| Authors: Yann G BOUCHER, Abdel-Fattah FARES |
Topic: Optical Technology Submitted On: 9/8/2006 Full Text [PDF] Pg.Nos: 80-86
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