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351 Papers Found. Displaying page 1 of 71:

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List of Papers:
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: MicrowaveTechnology:              Submitted On: 6/27/2008              Full Text  [PDF]      Pg.Nos: 419-425
Manuscript Title:  A New Regressor for Calculation of the Bandwidth of Rectangular Microstrip Antenna
Manuscript Id: IJMOT-2008-9-397
Abstract:  Microstrip antennas (MSAs) offer a number of unique advantages over other types of antennas. In MSA designs, it is important to determine the bandwidth of the antenna accurately because the bandwidth is a critical parameter of a MSA. For calculating the bandwidth of the rectangular microstrip antennas with thin and thick substrates, we present a new method based on the support vector regression (SVR) and Fuzzy C-Mean (FCM). The support vector regression (SVR) is a statistical learning method that generates input-output mapping functions from a set of training data. The bandwidth results obtained by using SVR and new proposed SVR are in excellent agreement with the experimental results available in the literature.
Authors:  Hadi sadoghi yazdi, Mehri sadoghi yazdi and Abedin Vahedian
Category: MicrowaveTechnology:              Submitted On: 9/16/2008              Full Text  [PDF]      Pg.Nos: 328-337
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: MicrowaveTechnology:              Submitted On: 1/4/2009              Full Text  [PDF]      Pg.Nos: 263-269
Manuscript Title:  Frequency- and Time-Domain Simulation of Microstrip Squares by Using 2D-FDTD Electromagnetic Analyses
Manuscript Id: IJMOT-2010-1-101
Abstract:  The time- and frequency-domain electromagnetic analyses of various microstrip squares were performed in order to know how the high-speed interconnects and the quarter-wave impedance-matching elements behave when used on printed circuit boards and integrated circuits. Both the characteristic impedance and physical length properties of these squares, seen from a steady-state in-frequency perspective are analyzed. Also, the step propagation characteristics in a single microstrip line, seen from a transient-behavior in-time standpoint, are investigated. A general equation expressing the propagation in the microstrip as a function of both, the phase velocity in the microstrip itself and the phase velocity in the dielectric, is used as the lengthening factor to compensate the shift in the resonant frequency.
Authors:  Alejandro Dueñas Jiménez
Category: MicrowaveTechnology:              Submitted On: 12/1/2009              Full Text  [PDF]      Pg.Nos: 1-6
Manuscript Title:  Compact Tunable and Dual band Circular Microstrip Antenna for GSM and Bluetooth Applications
Manuscript Id: IJMOT-2008-11-407
Abstract:  A Circular Microstrip Antenna with slot cut in it for tunable and dual band operation has been presented. The existence of an electrically small slot along the feed axis or the perpendicular axis changes the resonant frequency of the patch leading to tunability. If both slots co-exist and are of comparable lengths, which equals to greater than half of the radius, dual frequency operation is obtained. A design has been proposed for obtaining dual band operation for GSM 1800/1900 - Bluetooth 2450 MHz. Experiments have been performed to validate the theoretical results.
Authors:  K P Ray, S Nikhil, A Nair
Category: MicrowaveTechnology:              Submitted On: 3/28/2009              Full Text  [PDF]      Pg.Nos: 205-210
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