| Section A: Microwave Technology and Related Topics |
| Manuscript Title: Analysis of Dual Frequency Equilateral Triangular Microstrip Patch Antenna with Shorting Pin |
| Manuscript Id: IJMOT-2007-10-272 |
| Abstract: The effects of position of shorting pin and feed-probe in an equilateral triangular microstrip patch antenna are theoretically taken into account using transmission line model. At ds/dh =0.33, frequency ratio (FR) of upper resonant frequency to lower resonant frequency is minimum. It is observed that the minimum FR decreases if substrate permittivity increases and it varies from 2.81–1.68 for relative permittivity 1.0 to 9.8. While the FR increases if the distance of the shorting pin from that point (ds/dh =0.33) increases. Maximum FR is observed at the triangle tip. The maximum FR varies from 5.43–5.07, and it decreases if substrate permittivity increases. It is also observed that the resonance frequencies are almost constant with probe position. |
| Authors: Reena Pant, Pradyot Kala, R. C. Saraswat, S. S. Pattnaik |
Category: Microwave Technology Submitted On: 3/31/2008 Full Text [PDF] Pg.Nos: 62-68
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| Manuscript Title: A Circularly Polarized Annular-ring Patch Antenna with a Groundplane EBG Annular-slot Array |
| Manuscript Id: IJMOT-2007-10-275 |
| Abstract: The effects of tuning the parameters of an annular-ring circular patch antenna with a cross-slot are analyzed and discussed. Then, based on this structure, a novel antenna with an electromagnetic bandgap cell system, which consists of a 4×4 annular-slot array in the groundplane, is designed and both numerically and experimentally evaluated. When compared to the annular-ring patch antenna on a groundplane of the same size without EBG structure, the proposed antenna presents a significant increase in the impedance bandwidth, axial-ratio bandwidth and gain. On the other hand, the insertion of the EBG structure allows a 10% reduction of the centre frequency when compared to the annular-ring patch antenna on a conventional groundplane. The simulated and measured results are in good agreemen |
| Authors: X.L. Bao, G. Ruvio, M. J. Ammann |
Category: Microwave Technology Submitted On: 10/18/2007 Full Text [PDF] Pg.Nos: 69-75
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| Manuscript Title: Antenna diversity using Particle Swarm Optimization |
| Manuscript Id: IJMOT-2007-11-279 |
| Abstract: Particle swarm optimization technique is a soft computing approach and has many Engineering applications. In this paper the optimization technique viz., Particle swarm optimization is used to calculate separation between antennas. Space diversity method is based upon the principle of using two or more antennas in order to receive uncorrelated radio signal. By doing this, there is a possibility of combining the antenna outputs so that the fading can be avoided. To minimize fading of a signal and calculating antennas spacing we use Particle swarm optimization. |
| Authors: Rajesh Kumar, Dr.S.S.Pattnaik and Swapna Devi |
Category: Microwave Technology Submitted On: 11/16/2007 Full Text [PDF] Pg.Nos: 76-79
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| Manuscript Title: Analysis of U-slot loaded Patch for Dualband Operation |
| Manuscript Id: IJMOT-2007-11-280 |
| Abstract: The analysis of U- slot loaded patch is carried out using equivalent circuit concept. The antenna exhibits dual resonance and the separation between two resonances is sensitive to the dimension of the slot. The theoretical results are compared with the simulated data using IE3D software which are in close agreement. Further radiation pattern is found to be invariant with the slot dimensions. |
| Authors: J A Ansari, Satya Kesh Dubey, Prabhakar Singh, R. U. Khan and Babau R. Vishvakarma |
Category: Microwave Technology Submitted On: 4/3/2008 Full Text [PDF] Pg.Nos: 80-84
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| Manuscript Title: Foster reactance theorem in fractional dual guiding structures |
| Manuscript Id: IJMOT-2006-10-226 |
| Abstract: We have addressed the issue of Foster reactance theorem for
fractional dual guiding structures. It is found that for each
value of fractional parameter, Foster reactance theorem is
satisfied. That is for each value of fractional parameter,
fractional dual reactance and fractional dual susceptance are
increasing function of frequency. |
| Authors: Musarat Abbas and Sajid Abbas Naqvi |
Category: Microwave Technology Submitted On: 4/23/2007 Full Text [PDF] Pg.Nos: 85-87
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| Manuscript Title: Stop Band Characteristics for Periodic Patterns of CSRRs in the Ground Plane and its Applications in Harmonic Suppression of Band Pass Filters |
| Manuscript Id: IJMOT-2007-2-235 |
| Abstract: Stop band filters are designed by etching periodic patterns of complementary split ring resonators (CSRRs) in the ground plane of a microstrip line. CSRRs, being sub-wavelength resonators, their size are much smaller than the conventional microstrip resonators. It has been observed that single CSRR has a very high Q and gives high attenuation in the stop band. It has also been observed that the period of the CSRR loaded microstrip line can be made as small as λ/10 of the operating wavelength. With the increased number of CSRRs etching and decreased period of the periodic structure loaded with CSRRs, the stop band width increases and the rejection level in the stop band increases. It has been observed for the first time that combining capacitive stub loading along with CSRRs completely suppresses the nearby harmonic passbands of band pass filters and the out-of-band performance improves without compromising the in-band filter performance. |
| Authors: R. S. Kshetrimayum, S. Kallapudi, S. S. Karthikeyan |
Category: Microwave Technology Submitted On: 5/23/2007 Full Text [PDF] Pg.Nos: 88-95
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| Manuscript Title: Design and Implementation of a 5.25GHz MIMO RF Transceiver |
| Manuscript Id: IJMOT-2007-11-278 |
| Abstract: This paper describes the design and implementation of an RF transceiver for a 2x2 MIMO testbed. The transceiver was built with off-the-shelf components on several printed circuit boards. It has a carrier frequency of the is 5.25GHz and a bandwidth of 25MHz. The design flow from the specification of the transceiver to the frequency plan, the RF architecture and the actual implementation are presented. Tradeoffs in designing the transceiver are discussed and solutions are evaluated and presented. The transceiver was fully calibrated and was deployed in a series of field measurements. Results from the calibration process are shown. Hardware impairments, in particular I/Q mismatch and phase noise, are discussed and optimized on hardware and in software. Results of these optimizations are also presented |
| Authors: Stephan Lang, Raghu Mysore Rao, Babak Daneshrad |
Category: Microwave Technology Submitted On: 11/12/2007 Full Text [PDF] Pg.Nos: 96-105
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| Manuscript Title: MINIMIZATION OF THE RELATIVE CONVERGENCE PHENOMENON |
| Manuscript Id: IJMOT-2007-2-238 |
| Abstract: In this paper a numerical study is carried out in order to establish a systematic convergence criteria for the Generalized Transverse Resonance (GTR) method. These criteria allow an optimum determination of the number of modes to be used in either side of a Finline Step Discontinuity under analysis. Applying the optimal modal ratio, and using basis functions incorporating the singular behavior of fields at edges and the efficient Singular Value Decomposition (SVD) technique, accurate results in the GTR method are obtained. |
| Authors: Jaber El Hadad, Antoni Barlabé, A. Comerón |
Category: Microwave Technology Submitted On: 2/8/2007 Full Text [PDF] Pg.Nos: 106-109
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| Manuscript Title: Short-Circuited Quarter Wavelength Cylindrical-Rectangular Microstrip Patch Antenna |
| Manuscript Id: IJMOT-2007-10-276 |
| Abstract: In this study we would like to take into account the problems of resonance and radiation of a short-circuited quarter wavelength cylindrical-rectangular microstrip patch antenna. Transmission line model is used to calculate the input impedance of the patch, while the combination of array theory and cavity model is used to calculate its radiation pattern. It is observed that the beam-width, resonant frequency, and resonant resistance decrease with cylinder radius. Peak radiated power increases with cylinder radius, but beyond the critical angle, radiated power decreases with cylinder radius. Critical angle increases with cylinder radius and substrate permittivity. The difference of peak radiated power decreases with substrate permittivity, and power radiation beyond 90 degree is possible for cylindrical rectangular patch. The bandwidth is not sensitive to curvature but it decreases as substrate permittivity increases. |
| Authors: Reena Pant, Pradyot Kala, S. S. Pattnaik, R. C. Saraswat |
Category: Microwave Technology Submitted On: 4/22/2008 Full Text [PDF] Pg.Nos: 110-118
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| Section B: Optical Technology and Related Topics |
| Manuscript Title: OBI Reduction Method in MOC-SCM Systems using Optical Carrier Suppression |
| Manuscript Id: IJMOT-2007-2-237 |
| Abstract: Optical Beat Interference (OBI) can adversely affect passive Optical Networks (PON) that employs Multiple Optical Carrier Subcarrier Multiplexing (MOC-SCM). The authors propose an OBI reduction method employing carrier suppressed MOC-SCM system. A mathematical model is developed and an experiment is carried out to analyze the performance of the proposed system. The experimental results are in agreement with the mathematical model, which demonstrate an improvement of 27.8 dB in the Carrier-to-Interference Ratio (CIR). |
| Authors: M. T. Al-Qdah, H. A. Abdul-Rashid, M. B. Tayahi, H. T. Chuah, M. K. Abdullah |
Topic: Optical Technology Submitted On: 2/3/2007 Full Text [PDF] Pg.Nos: 119-124
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| Manuscript Title: A Novel MEMS Micromirror Optical Switch |
| Manuscript Id: IJMOT-2007-9-270 |
| Abstract: A novel optical switch based on micro electro mechanical systems (MEMS) technology has been proposed. Two types of switch configurations have been analyzed. The collimating lenses used in other MEMS switches have been eliminated thus making the switch smaller in size and cheaper in cost. Theoretical analysis of the switch characteristics is compared with the experimental results |
| Authors: Rashmi Bahuguna, Steffen Kurth, Banmali S. Rawat, Thomas Gessner |
Topic: Optical Technology Submitted On: 9/26/2007 Full Text [PDF] Pg.Nos: 125-133
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| Manuscript Title: An experimental investigation of Er+3-doped optical amplifiers with very low 1480 nm pump power |
| Manuscript Id: IJMOT-2007-7-260 |
| Abstract: The paper presents an experimental investigation of the performance characteristics of erbium-doped fiber amplifiers (EDFAs) with very low 1480 nm pump power considering a double-pass configuration with suppressed amplified spontaneous emission (ASE). The suppressed ASE is achieved by implementing the tunable band pass filter (TBF). Both co- and counter-pumping schemes are considered in the experimental approach. The measured gain shows significant improvement compared to a single-pass and double-pass without ASE suppression with the same pump power. However, no significant improvement is achieved when co- and counter-pumping schemes are employed. |
| Authors: S. S. Pathmanathan, H. A. Abdul-Rashid, P. K. Choudhury |
Topic: Optical Technology Submitted On: 7/25/2007 Full Text [PDF] Pg.Nos: 134-138
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