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Time filter

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Durgāpur, India

Sarkar P.,Indian National Institute of Engineering | Ghatak R.,National Institute of Technology Durgapur | Pal M.,NFET | Poddar D.R.,Jadavpur University
IEEE Microwave and Wireless Components Letters | Year: 2012

In this letter, an ultra-wideband (UWB) bandpasss filter with multiple notch bands is presented. The UWB bandpass characteristic is achieved using a modified distributed highpass filter (HPF) and suppressing higher order harmonics of the HPF by realizing defected stepped impedance resonator. The dual band notches at 5.75 and 8.05 GHz are obtained by embedding two open stubs on the main microstrip line. The in band and out of band performance obtained from fullwave electromagnetic simulation, equivalent circuit model and measurement are in good agreement. © 2001-2012 IEEE. Source


Sarkar P.,North - Eastern Hill University | Pal M.,NFET | Ghatak R.,National Institute of Technology Durgapur | Poddar D.R.,Ja davpur University
Progress in Electromagnetics Research Letters | Year: 2013

In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upper stopband is presented. The ultrawide passband characteristic is achieved using a microstrip to slot line transition, and a wide upper stop band is realized using an elliptical lowpass filter. The dual band notches at 5.46 GHz and 8.04 GHz are obtained by incorporating defected microstrip structure in the input and output sections. A prototype of the proposed UWB bandpass filter is fabricated and measured. The equivalent circuit of the proposed filter is also presented. A good agreement between the measured, EM simulated and circuit simulated responses is obtained. Source


Gorai A.,KIIT University | Karmakar A.,Netaji Subhash Engineering College | Pal M.,NFET | Ghatak R.,National Institute of Technology Durgapur
Progress In Electromagnetics Research C | Year: 2013

A super-wideband antenna based on a propeller shaped printed monopole with a CPW feed is presented in this paper. The enhanced bandwidth is obtained by modifying the disk of a conventional circular disk monopole to resemble a propeller. This design produces an extremely wide impedance bandwidth from 3 to 35 GHz with an impedance bandwidth ratio of 11.6: 1. The gain of the proposed antenna varies from 4 dBi to 5.2 dBi. The antenna has fairly stable radiation characteristics throughout its operating band. The developed prototype is fabricated and measured. Simulation and experimental results are in good agreement. Source


Ghatak R.,National Institute of Technology Durgapur | Pal M.,NFET | Goswami C.,Asansol Engineering College | Poddar D.R.,Jadavpur University
Microwave and Optical Technology Letters | Year: 2013

In this article, a novel design of complementary spiral resonators as miniaturized metamaterial particles based on Moore curve fractal shape is presented. The proposed design of metamaterial unit cell is investigated using a microstrip line loaded with series gap discontinuities and implementing fractal shape complementary spiral resonator in ground plane that behaves as a composite right left hand transmission line. It is observed that Moore curve fractal-shaped spiral resonator provides 49% size reduction as compared to conventional split ring resonators. An equivalent lumped element circuit model of the proposed composite right left handed transmission line is developed to analyze the proposed topology. A close agreement between electromagnetic simulation, circuit simulation, and measurement is obtained. Copyright © 2013 Wiley Periodicals, Inc. Source


Gorai A.,National Institute of Technology Durgapur | Karmakar A.,Netaji Subhash Engineering College | Pal M.,NFET | Ghatak R.,National Institute of Technology Durgapur
Journal of Electromagnetic Waves and Applications | Year: 2013

A planar elliptical shape band-notched UWB antenna with multiple fractal-shaped slots and a Sierpinski fractal curve-shaped ring resonator at the back of the substrate is introduced in this paper. The proposed antenna exhibits a triple-band notch characteristic. Koch fractal slot etched from the radiator is responsible for creating notched band centred at 5.5 GHz for wireless local area network rejection. The Minkowski fractal slots in the ground planes create rejection characteristics at 8.1 GHz to avoid interference with X-band uplink satellite communication systems. The RFID rejection band centred at 6.8 GHz is achieved by using a Sierpinski fractal curve-shaped ring resonator at the back of the substrate. Sierpinski fractal slot of third iteration on the radiator contributes to an impedance bandwidth of 2.8-12 GHz with VSWR > 2 by improving matching at lower frequencies except at three notched bands. The antenna gain varies from 1.5 to 4 dBi over the band. Stable radiation patterns are obtained throughout its operating frequency. The antenna has a compact size of 41 mm × 45 mm. © 2013 Taylor & Francis. Source

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