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Debi Dutta

Bio: Debi Dutta is an academic researcher from University of Calcutta. The author has contributed to research in topics: Microstrip & Ground plane. The author has an hindex of 1, co-authored 5 publications receiving 3 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors explored a novel technique to minimize cross-polarized (XP) fields of a microstrip patch across all radiation planes, i.e., around the diagonal plane of radiation.
Abstract: This letter explores a novel technique to minimize cross-polarized (XP) fields of a microstrip patch across all radiation planes. This inherent issue is more challenging to mitigate over the skewed, i.e., around the diagonal plane of radiation. A possible way to address this specific challenge by controlling the ground plane (GP) current has been discussed. Strategic but simple engineering has been demonstrated with a representative S-band rectangular patch. It shows the possibility of removing as much as 45% metal from the GP cladding, maintaining its impedance and the primary radiations unaltered. The targeted reduction in XP fields has been experimentally demonstrated by a maximum of 10 dB over the diagonal planes and 13 dB in H-plane. This approach should find potential applications in adaptive arrays and space antennas where three-dimensional (3-D) coverage with reduced XP values is an important requirement.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a strategic metal pole has been introduced to control the modal current of an orthogonal higher mode (TM02) but leaving the fundamental radiating mode untouched, and the pole height can be reduced by 40% −63% by accepting a tradeoff in XP suppression by 3 dB.
Abstract: This letter explores a new concept for the first time to control a specific unwanted higher mode in a microstrip patch with a target to reduce its cross-polarized (XP) radiation over the orthogonal plane. A strategic metal pole has been introduced to control the modal current of an orthogonal higher mode (TM02) but leaving the fundamental radiating mode (TM10) untouched. The conjecture has been successfully verified in S -band. The approach is the simplest of all explored earlier, requiring no multiparameter optimization or fabrication complexity except requiring an additional vertical space. Antenna impedance and primary radiations are insensitive to this technique but it ensures 11dB XP suppression over the orthogonal plane. The pole height can be reduced by 40%–63% by accepting a tradeoff in XP suppression by 3 dB.

12 citations

Proceedings ArticleDOI
01 Dec 2019
TL;DR: In this paper, a wideband shorted differentially fed patch antenna has been explored based on the composite aperture concept, and two λ g /4-folded S-band patches are placed on a compact ground plane which promises 200° wide symmetrical radiation patterns over the principal planes along with 50% operating bandwidth.
Abstract: In this paper, a wideband shorted differentially fed patch antenna has been explored based on the composite aperture concept. Two λ g /4-folded S-band patches are placed on a compact ground plane which promises 200° wide symmetrical radiation patterns over the principal planes along with 50% operating bandwidth. 7 dBi peak gain has been recorded with more than 45 dB co-to-cross-polarized isolation spanning over 360° angular range.

2 citations

Journal ArticleDOI
TL;DR: In this paper , the authors address a concern of aperture coupled microstrip patch which is commonly overlooked and propose a simple strategic approach to reform the same for a rectangular patch, which achieves an overall XP discrimination by nearly 27dB from the perspective of 3D radiation scenario.
Abstract: This work addresses a concern of aperture coupled microstrip patch which is commonly overlooked. Such feeding configuration is typically believed to be immune to high cross-polar (XP) radiations, which indeed is a paradox. It actually offers considerably low XP only across H-plane, but concerning high XP over its diagonal or skewed planes (azimuth $\approx 45^{\circ }$ -70°). An aperture feed, therefore, hardly reveals any advantageous feature in terms of the overall XP discrimination. Such a major shortcoming of aperture-fed microstrip, to the best of our knowledge, has been addressed and successfully resolved in this article for the first time. It explores a way of mitigating near field issues based on theoretical analysis and has proposed a simple strategic approach to reform the same for a rectangular patch. A representative design, theoretical justification, and experimental studies with an S-band prototype have been presented. XP suppression by 11dB has been experimentally achieved in the diagonal (D-) plane with no considerable changes in its H- or E-plane. That eventually attains an overall XP discrimination by nearly 27dB from the perspective of 3D radiation scenario. The proposed technique hardly affects the co-polar radiations or gain of its traditional design. Moreover, this is satisfactorily functioning for a $2\times 2$ sub-array with a remarkable co-to-cross isolation by about 34dB over the entire radiation planes.
Proceedings ArticleDOI
05 Jul 2020
TL;DR: In this article, a kind of metallic perturbation on the ground plane of a microstrip patch has been examined indicating some interesting as well as useful features, such as a strategic geometry, its location, and dimension can magically improve the pattern symmetry and also the cross-polarized (XP) level.
Abstract: A kind of metallic perturbation on the ground plane of a microstrip patch has been examined indicating some interesting as well as useful features. A strategic geometry, its location, and dimension can magically improve the pattern symmetry and also the cross-polarized (XP) level. A pair of metallic posts in an X-band rectangular patch demonstrates the same indicating about 20 dB improvement in the XP radiations. This design is free from fabrication tolerance and other high frequency related issues.

Cited by
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Journal ArticleDOI
TL;DR: In this paper, a strategic metal pole has been introduced to control the modal current of an orthogonal higher mode (TM02) but leaving the fundamental radiating mode untouched, and the pole height can be reduced by 40% −63% by accepting a tradeoff in XP suppression by 3 dB.
Abstract: This letter explores a new concept for the first time to control a specific unwanted higher mode in a microstrip patch with a target to reduce its cross-polarized (XP) radiation over the orthogonal plane. A strategic metal pole has been introduced to control the modal current of an orthogonal higher mode (TM02) but leaving the fundamental radiating mode (TM10) untouched. The conjecture has been successfully verified in S -band. The approach is the simplest of all explored earlier, requiring no multiparameter optimization or fabrication complexity except requiring an additional vertical space. Antenna impedance and primary radiations are insensitive to this technique but it ensures 11dB XP suppression over the orthogonal plane. The pole height can be reduced by 40%–63% by accepting a tradeoff in XP suppression by 3 dB.

12 citations

Journal ArticleDOI
TL;DR: In this article, a simple and miniaturized design of rectangular microstrip patch antenna (RMPA) is presented with improved cross-polarization (XP) purity, which is much more flexible to tune the resonance frequency of the antenna for its optimum performance.
Abstract: A simple and miniaturized design of rectangular microstrip patch antenna (RMPA) is presented with improved cross-polarization (XP) purity. This design approach is much more flexible to tune the resonance frequency of the antenna for its optimum performance. A complete design guideline based on theoretical analysis has been provided to estimate the antenna resonance frequency and corresponding resonant mode. The higher-order spurious mode, orthogonal to the co-polarized fields, has been identified as the source of XP radiation. The physical insight into the XP suppression has been thoroughly discussed and successfully applied for an optimum design. An improved antenna configuration has been realized without any perturbation in the radiating patch or the ground plane. Size, gain, and impedance matching of the proposed antenna have also been considered along with the suppression of XP value. This may be applicable to any conventional working RMPA by introducing very small possible changes. As much as 16 dB suppression of XP radiation is realized in the H-plane without affecting the co-polarized peak-gain value of 5.27 dBi. The proposed concept has been experimentally validated using a set of antenna prototypes. Measured results are closely corroborated with the simulated predictions.

11 citations

Book ChapterDOI
01 Jan 2022
TL;DR: This study examined to what degree performance on WAIS-IV verbal subtests predicts performance on executive functioning measures (Trails Making-B, Category, and Wisconsin Card Sort Test) and found Categories is the best predictor.
Abstract: The

7 citations

Journal ArticleDOI
TL;DR: In this article , the authors revisited the reasons behind the cross-polarized (XP) radiation in microstrip patches and focused on alleviating a long-standing deficiency in terms of a comprehensive knowledge about the same.
Abstract: This article revisits the reasons behind the cross-polarized (XP) radiation in microstrip patches and focuses on alleviating a long-standing deficiency in terms of a comprehensive knowledge about the same. This study has a twofold objective. First, it explores all possible components of the surface fields as the correlating factors over all of the radiation planes, especially across the diagonal or skewed axes. An extensive study involving varied patch geometries along with different feed networks has been executed. The resulting huge volume of data has been analyzed to identify the ideal surface field requirements for the best possible XP performance.

5 citations

Journal ArticleDOI
TL;DR: In this article , the surface current distribution in a rectangular microstrip patch is modified to reduce the H-plane cross-polarized (XP) radiations along with minimizing the backside radiation to some extent.
Abstract: This work explores an idea of modifying surface current distribution in a rectangular microstrip patch which contributes to reducing its H-plane cross-polarized (XP) radiations along with minimizing the backside radiation to some extent. A pair of grounded spikes has been strategically used and the physics behind its operation in weakening the XP generating TM02 mode has been thoroughly discussed. The vertical height of the spike is typically $\lambda $ /4 and a further investigation demonstrates shortening of its effective height by folding the same by 90°. A set of prototypes has been experimentally studied to ensure the predicted characteristics viz. the 12 dB consistent suppression of XP level over the whole range of elevation in H-plane and an average of 5–7 dB suppression in backside radiation. These achievements are also associated with more than 1 dB improvement in peak gain. The design is straightforward, low cost, and commercially viable. The nonplanar feature restricts its use only to those applications where antenna front is open or can accommodate the vertically extended or 90° bent spikes.

5 citations