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Ahmadābād, India

Alad R.H.,Dharmsinh Desai University | Chakrabarty S.B.,Antenna Systems Group
Progress In Electromagnetics Research B | Year: 2012

This paper presents comparative studies on different types of basis and testing functions used in Method of Moments (MoM) in terms of analytical complexity, convergence and condition number of the co-efficient matrix when applied to electrostatic problem of evaluating capacitance and charge distribution of conducting bodies. A thin conducting cylinder of finite length has been taken as a representative case study to evaluate the capacitance and charge distribution. The basis and testing functions which have been studied for this problem are pulse-delta, pulse-pulse, triangular-delta, triangular-pulse and triangular-triangular functions respectively. Numerical data on capacitance and charge distribution has been presented for each set of basis and testing functions in terms of condition number and convergence. Source


Alad R.H.,Dharmsinh Desai University | Chakrabarty S.,Antenna Systems Group
IEEE Transactions on Plasma Science | Year: 2015

This paper presents the evaluation of a capacitance matrix and the temporal body potential of an artificial orbiting satellite considering a metallic cuboid, parabolic reflector antennas, and solar panels. Integral equations are formed by relating the unknown charge density on the metallic conductor and are solved using the method of moments, in which the pulse functions are used as basis functions and the delta functions are used as testing functions. The surfaces of the conducting structure are meshed using nonuniform triangular subareas. The matrix equations are solved using an iterative generalized minimum residual algorithm. The numerical data on the capacitance matrix and the charge distribution of these structures have been presented. The validity of this analysis has been established by comparing the data on capacitance available in the literature for the metallic cuboid with the data on capacitance computed by the present method for similar structures. The temporal behavior of body potential of the satellite is computed for different cases. © 2015 IEEE. Source


Bhattacharya A.,University of Burdwan | Jyoti R.,Antenna Systems Group
2015 IEEE 2nd International Conference on Recent Trends in Information Systems, ReTIS 2015 - Proceedings | Year: 2015

In this paper the design of an X-band frequency reconfigurable patch antenna has been demonstrated using PIN diode. A square slot has been introduced in order to realize PIN diode effect in antenna parameters. The tuning of frequency is realized by changing its effective electrical length, which is controlled by different mode of the PIN diode by applying different bias voltages across it along the slot of the antenna. An annular slot rectangular patch antenna is used and a gap of 2mm is used to attach PIN diode. When the PIN diode is forward biased i.e gap is closed by PIN diode and current will flow along the outer ring. ±60 MHz (1.34 %) tuning of frequency has been obtained by applying the bias voltage of 3 volt. The structure has been simulated in ADS software. Simulated and measured performances are presented. Results are used to demonstrate that there is good agreement between the simulated and measured results. The match between simulation and measured results suggests that proposed candidate can be used as a frequency reconfigurable antenna. © 2015 IEEE. Source


Alad R.H.,Dharmsinh Desai University | Chakrabarty S.B.,Antenna Systems Group
Indian Journal of Radio and Space Physics | Year: 2015

The paper presents the evaluation of capacitance matrix of an artificial orbiting satellite considering a composite metallic structure of a parabolic reflector antenna with cuboid and plates. Integral equations are formed by relating the unknown charge density on the metallic conductor and are solved using the Method of Moments (MoM) in which the pulse functions are used as basis functions and the delta functions are used as testing functions. The surfaces of the conducting structure are meshed using non-uniform triangular patches. The matrix equations are solved by iterative generalized minimum residual (GMRES) algorithm. The numerical data on the capacitance matrix and charge distribution of these structures have been presented. The capacitance of a metallic cuboid is computed to validate the approach. Source


Bhattacharya A.,University of Burdwan | Sahu L.K.,University of Delhi | Jyoti R.,Antenna Systems Group
IEEE MTT-S International Microwave and RF Conference 2014, IMaRC 2014 - Collocated with Intemational Symposium on Microwaves, ISM 2014 | Year: 2015

A zigzag shaped, single band, small size Planar Inverted F antenna (PIFA) at 2.45 GHz is introduced and investigated. Total size of the antenna is 15mm × 6 mm which complies easily for integration with other devices viz. USB dongle. S11 of-32 dB at 2.45 GHz with-10 dB bandwidth of 4.2% has been obtained. Gain of the antenna is-1.82 dBi and pattern is omnidirectional. For proper matching with 50 Ω source, a transformer has been integrated at feeding point. The structure has been simulated using commercial available Ansys HFSS simulator. There is good agreement between simulated and measured results. The patterns are omni-directional which proves that the antenna is a good candidate for wireless communications. © 2014 IEEE. Source

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