This paper address some unwanted effect caused by the defects in the defected ground structure (DGS) integrated antennas those are popular for suppressed cross-polarized (XP) radiations. An innovative design with asymmetric-arc-DGS has been explored which results in better performance over the earlier reported designs. Some increase in the back radiation is also associated with DGS integrated antennas. A novel configuration of parallel electric walls has been proposed to take care of these back radiations. Detail investigations have been carried out at X-band using simulated results. The proposed DGS provides about 18 dB suppression in the peak XP radiations. The side-walls provides about 10 dB suppression in the radiations towards the backside of the antenna. With this configuration, the XP radiations is found to be 30 dB below the co-polarized peak over the complete azimuth range in both the principal planes. © 2018 IEEE.

DEBATOSH GUHA

Radio Physics and Electronics

C KUMAR

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Unwanted Effects of Defects Used in Microstrip Antenna Designs and Possible Solutions

2018 IEEE Indian Conference on Antennas and Propagation, InCAP 2018

Experiments with probe-fed circular patches using conventional and defected ground planes flashed some interesting features relating to cross-polarized (XP) electric fields and associated radiations before the present authors. Those led to a series of new investigations for understanding the nature of XP fields and to deal with them using defected ground structure (DGS) for improved XP performance. In the first phase of investigation, the XP radiations of a probe-fed circular patch with conventional ground plane have been critically studied as a function of the radial probe location. Remarkably significant effect is experimentally demonstrated. New information about orthogonal resonant fields and its importance in designing an antenna is provided. In the second phase of investigation, limitations of dot-shaped DGS in reducing XP level are experimentally studied. As its improved variants, two new DGS geometries such as annular ring and circular arcs have been explored. The arc-DGS appears to be highly efficient in terms of suppressing XP fields. Suppression by 10-12 dB has been experimentally demonstrated. Each design has been experimented in both C- and X-bands to earn confidence on the measured data. © 2006 IEEE.

IEEE Transactions on Antennas and Propagation

Nature of cross-polarized radiations from probe-fed circular microstrip antennas and their suppression using different geometries of defected ground structure (DGS)

Microstrip and Printed Antennas: New Trends, Techniques and Applications

Defected Ground Structure for Microstrip Antennas

A defected ground structure (DGS) is proposed to reduce the cross-polarized (XP) radiation of a microstrip patch antenna. The proposed DGS pattern is simple and easy to etch on a commercial microstrip substrate. This will only reduce the XP radiation field without affecting the dominant mode input impedance and co-polarized radiation patterns of a conventional antenna. The new concept has been examined and verified experimentally for a particular DGS pattern employing a circular patch as the radiator. Both simulation and experimental results are presented. © 2005 IEEE.

Journal	Data powered by Typeset2018 IEEE Indian Conference on Antennas and Propagation, InCAP 2018
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open Access	No