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Sudipta Chattopadhyay

Bio: Sudipta Chattopadhyay is an academic researcher from Mizoram University. The author has contributed to research in topics: Microstrip antenna & Patch antenna. The author has an hindex of 12, co-authored 58 publications receiving 522 citations. Previous affiliations of Sudipta Chattopadhyay include Siliguri Institute of Technology.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a simple rectangular microstrip antenna on slot-type defected ground plane is proposed for reduced cross-polarized (XP) radiation and justified theoretically, which will reduce the XP radiation field compared to a conventional micro-strip antenna without affecting its copolarised (CP) radiation characteristics.
Abstract: A simple rectangular microstrip antenna on slot-type defected ground plane is proposed for reduced cross-polarized (XP) radiation and justified theoretically. This will reduce the XP radiation field compared to a conventional microstrip antenna without affecting its copolarized (CP) radiation characteristics.

69 citations

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TL;DR: In this paper, a rectangular microstrip patch on a composite substrate is theoretically and experimentally investigated, and the proposed configuration shows as much as 75% increment in beam width in its H-plane and nearly 10% in E-plane, indicating peak gain of the order of 8 dBi.
Abstract: A rectangular microstrip patch on a composite substrate is theoretically and experimentally investigated. Considerably wide radiation beamwidth along with high gain is experimentally demonstrated. Compared to a conventional microstrip patch, the proposed configuration shows as much as 75% increment in beam width in its H-plane and nearly 10% in E-plane, indicating the peak gain of the order of 8 dBi.

63 citations

Journal ArticleDOI
TL;DR: In this paper, a compact rectangular microstrip antenna with a shorted nonradiating edge was proposed and experimentally investigated for signifi cant suppression of cross-polarized (XP) radiation compared to maximum co-Polarized gain.
Abstract: A straightforward and compact rectangular microstrip antenna with a shorted nonradiating edge was proposed and experimentally investigated for signifi cant suppression of cross-polarized (XP) radiation compared to maximum co-polarized gain, without affecting the co-polarized radiation pattern. The proposed antenna was thoroughly studied using simulation and experimental results. A modifi ed cavity model (MCM) was also demonstrated to understand the behavior of the cross-polarized radiation and the complete resonance behavior for the new structure. The proposed theory helps to germinate a real and clear view of the observed phenomena. The proposed idea was experimentally confi rmed with the present structure on three different substrate materials, with different dielectric constants. The new approach presented here provides an insightful visualization-based understanding of cross-polarized suppression with the present structure.

57 citations

Journal ArticleDOI
TL;DR: The resonant modes and characteristics of a rectangular microstrip with a variable air gap were theoretically and experimentally examined in this article, and the effect of varying width to length ratio was addressed and a computer aided design was presented.
Abstract: The resonant modes and characteristics of a rectangular microstrip with a variable air gap are theoretically and experimentally examined. Effect of varying width to length ratio is another important aspect addressed and a computer aided design is presented. Thorough experiments are presented, a few of which are reported for the first time. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 169–173, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24025

47 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of the air gap along with the varying patch width in changing the patch impedance is thoroughly examined, and an efficient computer aided design formulation is developed and used for this study, and the computed results are experimentally verified.
Abstract: The input impedance of a rectangular microstrip patch with a variable air gap has been studied theoretically and experimentally. Unlike earlier investigations, the influence of the air gap along with the varying patch width in changing the patch impedance is thoroughly examined. An efficient computer aided design formulation is developed and used for this study, and the computed results are experimentally verified. Superiority of the present theory compared to some earlier models is also indicated.

36 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a novel phased array is presented to extend array scanning range by using pattern reconfigurable antenna elements and weighted thinned synthesis technology, which is capable of reconfiguring its patterns from broadside to quasi-endfire radiation by shifting states of PIN diode switches integrated on parasitic strips.
Abstract: A novel phased array is presented to extend array scanning range by using pattern reconfigurable antenna elements and weighted thinned synthesis technology in this paper. The pattern reconfigurable microstrip Yagi antenna element is used as a basic element in array and it is capable of reconfiguring its patterns from broadside to quasi-endfire radiation by shifting states of the PIN diode switches integrated on parasitic strips. A weighted thinned linear array synthesis technique is analyzed and some interesting conclusions have been made. A linear array composed of eight pattern reconfigurable antenna elements is manufactured to demonstrate the excellent performance of the array. The active element pattern of each element is measured and pre-stored. Based on active element patterns and weighted thinned linear array synthesis technique, the pattern scanning performance of the novel array is synthesized. The results indicate that the array can scan its main beam from φ = -60° to φ = 60° in H-plane with gain fluctuation less than 3 dB while maintaining low side lobes, and the -3 dB beam width coverage is about from φ = -68° to φ = 68°. The performance is superior to the traditional phased array made of wide-beam elements.

183 citations

Journal ArticleDOI
TL;DR: In this article, an improved phased array using pattern reconfigurable antenna elements in this communication is proposed to realize wide-angle scanning performance with low gain fluctuation, where the antenna array is a microstrip Yagi antenna with its parasitic strips loaded with varactors.
Abstract: An improved phased array using pattern reconfigurable antenna elements in this communication is proposed to realize wide-angle scanning performance with low gain fluctuation. The pattern reconfigurable element is a microstrip Yagi antenna with its parasitic strips loaded with varactors. The reconfigurability of radiation pattern from the element is enabled by tuning the capacitive reactance of the varactors. Five elements were arranged in an equally spaced linear array, and the effects of several key parameter variations on the radiation characteristics of the array are provided. The proposed array is fabricated and experimentally verified. It is seen from the measured results that the main beam of the array can scan from $- 70^\circ $ to 70° in the $H$ -plane with a gain fluctuation less than 2 dB. Meanwhile, the coverage of 3-dB beamwidth of the array is from about $- 87^\circ $ to 87°. The agreement between simulated and measured results validates our design exhibiting a good performance of wide-angle scanning.

90 citations

Journal ArticleDOI
TL;DR: In this article, a defected ground structure (DGS) was used to control higher order modes up to third harmonic of the fundamental operating frequency in a microstrip line-fed patch antenna.
Abstract: Controlling higher order modes up to third harmonic of the fundamental operating frequency in a microstrip line-fed patch antenna has been successfully demonstrated. Harmonic rejection in the antenna has been achieved at its feed level using highly compact design of defected ground structure (DGS). Rejection characteristics have been improved adding an open stub to the feed line. All possible higher order modes occurring in between the fundamental and the 3rd harmonic have been identified. Relative suppression of radiated fields with and without DGS-control has been quantitatively measured and effective control of harmonics has been experimentally ensured. The area occupied by the proposed DGS has been compared with earlier designs and over 40-90% reduction in size has been documented.

88 citations

Journal ArticleDOI
TL;DR: In this paper, a wideband magnetoelectric (ME) dipole antenna with wide beamwidth both in the E-plane and H-plane is investigated, which is a differential one.
Abstract: In this paper, a wideband magnetoelectric (ME) dipole antenna with wide beamwidth both in the E-plane and H-plane is investigated The proposed antenna, which is a differential one, has a simple structure and can realize wide beamwidth in the E-plane and H-plane in whole operating bandwidth This antenna is easy to manufacture and low cost The antenna consists of a pair of $\Gamma$ -shaped metal plates, a $\Gamma$ -shaped fed line, and six metal columns The $\Gamma$ -shaped metal plates and metal columns change the current distribution which changes the radiation performance of the proposed antenna Some parameters, which effect on the performances of the antenna, are studied The proposed antenna achieves the impedance bandwidth (≤−10 dB) of about 811% (33–78 GHz) The half-power beamwidth (HPBW) of the proposed antenna is obviously broadened The HPBW is 215° in the E-plane and 186° in the H-plane at 55 GHz Besides, the cross polarization of the antenna is very low The antenna is fabricated and measured to verify the design The measured results are in good agreements with the simulated one Good radiation characteristics of the new ME dipole antenna have been obtained in the whole frequency band

70 citations