| Section A: Microwave Technology and Related Topics |
| Manuscript Title: Reconfigurable Patch Slot Antenna for Circular Polarization Diversity |
| Manuscript Id: IJMOT-2007-4-245 |
| Abstract: A novel design of a microstrip patch
antenna incorporated by two orthogonal L-shaped
switchable slots is proposed to achieve circular
polarization. Two pin diodes are inserted in to these
L-shaped slots and by making these two pin diodes
ON and OFF the antenna will radiate with either
right handed circular polarization or left handed
circular polarization with wide bandwidth. This
antenna can be used in Unlicensed & licensed
WiMAX (IEEE802.16a), future planetary missions
and satellite link. Further it has better return losses
when compared to traditional “Reconfigurable
patch antenna with switchable slots for polarization
diversity”. |
| Authors: S.Raghavan,D.Sriram Kumar, M.S.Kishore Kumar |
Category: Microwave Technology Submitted On: 6/27/2008 Full Text [PDF] Pg.Nos: 419-425
|
| Manuscript Title: Reduced Size Koch Fractal Hybrid Coupler for IEEE 802.11b/g Wireless Applications |
| Manuscript Id: IJMOT-2007-12-284 |
| Abstract: A new miniaturized Koch Fractal Hybrid
coupler is proposed using Koch Fractal curve. In
order to validate the results, the miniaturized Koch
Fractal Hybrid Coupler is designed, fabricated and
measured using Microstrip transmission line at
operating frequency 2.44 GHz. The measured results
verify the 182o phase difference between two output
ports. Also it has effectively improved bandwidth of
the return loss and isolation. Further more size of
the Conventional Hybrid Coupler is reduced while
keeping the performance unchanged. Experimental
results also show good consistent with the simulation
results. This Koch Fractal Hybrid coupler can be
used for IEEE 802.11b/g WLAN and Bluetooth
wireless applications. |
| Authors: K.Annaram, Deepak Ram Prasath , Dr.S.Raju, Dr.V.Abhaikumar |
Category: Microwave Technology Submitted On: 4/9/2008 Full Text [PDF] Pg.Nos: 426-431
|
| Manuscript Title: A CAD Oriented Model of Elevated Coplanar Waveguide for Millimeter Wave Applications |
| Manuscript Id: IJMOT-2008-1-291 |
| Abstract: In this paper the closed form analysis of Computer Aided Design oriented model for the characteristic impedance (z0) and the effective dielectric constant (εreff) of Elevated Coplanar Waveguide structures are obtained and performances are predicted using theoretical analysis. Numerically efficient and accurate formulae based on the conformal mapping method for the analysis of elevated coplanar waveguide structures are presented. Accurate closed form analysis formulas for Elevated Coplanar Waveguides are derived and verified with Matlab (7.0). These results have been compared with low loss MMIC rate race hybrid using Elevated Coplanar Waveguides. |
| Authors: T.Shanmuganantham ,S.Raghavan |
Category: Microwave Technology Submitted On: 3/28/2008 Full Text [PDF] Pg.Nos: 432-437
|
| Manuscript Title: A Circularly Polarized Rectangular Patch Antenna on a Cylindrical Surface |
| Manuscript Id: IJMOT-2007-12-286 |
| Abstract: The aperture method is used to examine the effect of (i) aspect ratio and curvature on polarization, and (ii) curvature on the radiation pattern for thin substrate cylindrical rectangular microstrip antenna. Numerical computations of the E(theta) and E(phi) for different modes for different cylinder radii and aspect ratios have been carried out. At aspect ratio 1.038, the phase difference within the operating bandwidth is found to range from about 85.40 to 88.10 degree. The optimal center operating frequency is 2196.5 MHz and the 3 dB bandwidth is found to be 27.7 MHz. Optimal aspect ratio decreases with an increase in the radius, and approaches a limiting value for a radius greater than about 35 cm. The half power bandwidth is almost constant with curvature radius. For a curvature radius of few wavelengths the pattern looks almost like a planar case, except for the radiation near 90 degree. |
| Authors: Reena Pant, Pradyot Kala, S. S. Pattnaik and R. C. Saraswat |
Category: Microwave Technology Submitted On: 3/17/2008 Full Text [PDF] Pg.Nos: 438-444
|
| Manuscript Title: 3 D Inductor for RF application |
| Manuscript Id: IJMOT-2008-1-292 |
| Abstract: For high frequency radar applications in the millimeter wave range, small standard planar spiral inductors are used. A 3 D inductor is presented where more distance is created structurally between the turn segments that carry currents in opositive direction. As compared to standard planar spiral inductor of identical dimensions, this structure provides an improvement in quality factor by 23-25 % with added improvement in inductance by 19 -23 %. This inductor is useful for radar applications in the frequency band 30-100 GHz. This inductor is realized using standard Taiwan Semiconductor Manufacturing Co. Ltd (TMSC) 0.25 meter, one poly and four metal CMOS process technology parameters. Results are presented using SONNET EM simulator (Evaluation). |
| Authors: A N Chandorkar ,N Bheema Rao |
Category: Microwave Technology Submitted On: 1/17/2008 Full Text [PDF] Pg.Nos: 445-450
|
| Manuscript Title: Compact surface-mountable LTCC-BGA antenna package for X-band applications |
| Manuscript Id: IJMOT-2008-1-287 |
| Abstract: This paper describes the design, modeling and implementation of a compact surface-mountable LTCC-BGA antenna package for use in X-band wireless communication. A stacked patch microstrip antenna is embedded on the top side of the LTCC package, while the electromagnetically shielded bottom side is used for RF signal routing. The complete BGA antenna package with dimensions of 12 mm x 12 mm x 1.4 mm was mounted on the PCB using standard surface-mounted device (SMD) assembly processes. The measured antenna characteristics of the package assembly showed a 10-dB impedance bandwidth of 5.8 % and a maximum gain of 4 dBi at 10 GHz. Moreover, an accurate circuit model for the BGA package was developed for use in efficient co-design of RF transceiver systems. Finally, the thermal fatigue reliability of the reflow soldered BGA assemblies was tested under harsh cycling conditions. |
| Authors: Mikko Komulainen, Tero Kangasvieri, Jyri Jantti, Heli Jantunen |
Category: Microwave Technology Submitted On: 1/5/2008 Full Text [PDF] Pg.Nos: 451-459
|
| Manuscript Title: Dual Band Ring Couplers Using T and П Sections |
| Manuscript Id: IJMOT-2008-3-294 |
| Abstract: New rat-race couplers that can be operated at two separate frequency bands are presented. The design is accomplished by transforming the lengths and impedances of the conventional rat-race into dual band T or П shaped sections. Simple design equations are used for basic design geometries. Then the rat-race coupler geometries are analyzed using a full wave electromagnetic (EM) simulator and then realized at 0.9425 and 1.96 GHz for global system of mobile communication (GSM) bands. Excellent agreement between simulated and measured results demonstrates the performance of the proposed couplers. Both ring structures have a wide frequency operation range in addition to the significant reduced-size of the П-section based coupler. |
| Authors: Majeed A. S. Alkanhal, Ashraf S. Mohra |
Category: Microwave Technology Submitted On: 3/9/2008 Full Text [PDF] Pg.Nos: 460-466
|
| Manuscript Title: Miniaturized Broadband Circularly Polarized Microstrip Antenna for WLAN |
| Manuscript Id: IJMOT-2008-1-294 |
| Abstract: Abstract- The design of a proximity coupled microstrip antenna, for the application in Wireless Local Area Network (WLAN) are reported here. This miniaturized circularly polarized microstrip antenna has required wide bandwidth for practical application. The simulated results using IE3D software, agree well with the measured results. |
| Authors: Jibendu Sekhar Roy, Milind Thomas and Jayanta Ghosh |
Category: Microwave Technology Submitted On: 1/21/2008 Full Text [PDF] Pg.Nos: 467-473
|
| Manuscript Title: Printed Monopole Antennas for Multiband Applications |
| Manuscript Id: IJMOT-2008-3-297 |
| Abstract: In this paper, we have investigated printed rectangular monopole antennas, which is basically a printed microstrip antenna with etched ground plane for multi-band applications. In particular, we have fabricated and tested printed rectangular monopole antennas for dual-band and penta-band applications. It has been observed that printed rectangular monopole antennas are small in size and simple in design and fabrication but its performance is very good for multiband applications. |
| Authors: Rakhesh Singh Kshetrimayum |
Category: Microwave Technology Submitted On: 3/17/2008 Full Text [PDF] Pg.Nos: 474-480
|
| Manuscript Title: Circularly Polarized Broadband Antenna with L-shaped Probe and Partly Covered Circular Wide-slot |
| Manuscript Id: IJMOT-2008-4-303 |
| Abstract: Abstract- A novel type of circularly polarized broadband antenna using a partly covered circular wide-slot is presented. This antenna consists of an aperture of the modified circular wide-slot and L-shaped feed probe. The circular wide-slot is covered partly to generate circular polarization with broadband characteristics in axial ratio. Variations in both axial ratio and S11 characteristics with dimensions of the structure are investigated. Furthermore, radiation patterns at several frequencies are presented.
|
| Authors: Takeshi Fukusako, Ryo Sakami and Kazuki Iwata |
Category: Microwave Technology Submitted On: 4/19/2008 Full Text [PDF] Pg.Nos: 481-486
|
|
| Section B: Optical Technology and Related Topics |
| Manuscript Title: Two-Users, 2.5 Gbps, Spectral Amplitude Direct Decoding OCDMA System Using High Power LED Source with MDW Codes |
| Manuscript Id: IJMOT-2007-10-271 |
| Abstract: This paper describes an experimental of 2.5 Gbps two users spectral-amplitude-coding optical code-division-multiple-access (SAC-OCDMA) system with spectral amplitude direct decoding technique using high power LED source. The optical coding is based on modified double weight (MDW) codes employing fiber Bragg grating encoder. A tunable bandpass filter decoder is tuned with a proper design on the basis of the correlation between the two users to totally eliminate the multiple access interference. Some preliminary experimental results as well as the transmission performances are presented in this paper. |
| Authors: M. D. A. Samad, Feras N. Hasoon, S. A. Aljunid, R. K. Z. Sahbudin, M. K. Abdullah, S. Shaari |
Topic: Optical Technology Submitted On: 10/9/2007 Full Text [PDF] Pg.Nos: 487-490
|
| Manuscript Title: MODELING TEMPERATURE DEPENDENT NONLINEARITY IN A LASER DIODE USING FUZZY LOGIC |
| Manuscript Id: IJMOT-2008-1-293 |
| Abstract: Modeling of non-linear behavior of a laser diode is carried out in this paper. A combined approach of fuzzy logic and neural network is used. An Adaptive Neuro-Fuzzy Inference System (ANFIS) based model is trained using experimental data. Theoretical analysis of temperature dependent nonlinearity becomes complex as it requires simultaneous consideration of mechanisms like Auger recombination, Inter Valence Band Absorption (IVBA), thermionic carrier emission out of the active region, lateral carrier spreading, passive layer absorption, spontaneous recombination within passive layers and optical gain reductions. An ANFIS based model presented in this paper accounts for this temperature dependent nonlinearity. Once the model is trained it computes the Total Harmonic Distortion (THD) and the power output for various drive currents and operating temperatures. The validation of the model using experimental data yields a Mean Squared Error (MSE) of 2.35x10-4 |
| Authors: N. Vijayakumar, Nisha S. Nair |
Topic: Optical Technology Submitted On: 8/11/2008 Full Text [PDF] Pg.Nos: 491-497
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