A new defected ground structure (DGS) consisting of concentric circular rings in different configurations is experimentally studied to examine the stopband characteristics. Unlike previous DGS designs, a metallic shielding is introduced at the back of the DGS to suppress any leakage or radiation, and this would be advantageous for microwave circuit applications. A wide stopband is demonstrated with a set of prototypes designed for X-band. Its application to suppressing mutual coupling in microstrip patch arrays is demonstrated. © 2006 IEEE.

DEBATOSH GUHA

Radio Physics and Electronics

JAWAD SIDDIQUI

S BISWAS

M BISWAS

Y M M ANTAR

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

Concentric Ring-Shaped Defected Ground Structures for Microstrip Applications

IEEE Antennas and Wireless Propagation Letters

Truncated-corner probe-fed (TCPF) patches are popular for their simple design that provides circularly polarized (CP) radiation with a very low axial ratio (AR). For a thin substrate (∼ 0.026λ), this antenna provides approximately 0.3% CP bandwidth (BW) (AR 3 dB along with S11 -10 dB). However, as the substrate thickness is increased for enhancing the matching BW, an offset among the frequencies featured with minimum AR and optimum S11 is observed. This degrades the effective BW, with an overlapping of both S11 &amp;lt;-10 dB and AR &amp;lt; 3 dB. © 1990-2011 IEEE.

IEEE Antennas and Propagation Magazine

Application-Friendly Improved Designs of Single-Fed Circularly Polarized Microstrip Antenna [Antenna Applications Corner]

This communication proposes a new idea of compensating spurious radiations usually occurring from the sharp transitions at patch to feed and feed to impedance transformer junctions which result in added cross-polarized (XP) fields in planar microstrip-fed patches. A strategic design and deployment of defected ground structure (DGS) have been explored successfully as a potential means to resolve such long-standing radiation issues. The quantum of radiations from the feed has been theoretically estimated. These along with the main source of XP fields (higher order mode) have been addressed by introducing a composite type of DGS. The experimental validation executed at the C-band establishes this simple low-cost solution with a promise of 10 to 14 dB improvement in the H-plane XP fields. It is also ensured that the proposed technique is equally useful in realizing dual-fed dual-polarized configurations without affecting the primary radiation and antenna performance. © 1963-2012 IEEE.

IEEE Transactions on Antennas and Propagation

Simultaneous Compensation of Microstrip Feed and Patch by Defected Ground Structure for Reduced Cross-Polarized Radiation

Defected ground structure (DGS) integrated microstrip array has been explored and demonstrated here for the first time with the primary aim of achieving improved polarization purity. A shaped DGS with variable configuration has been conceived and designed for rectangular arrays. This unleashes new potential of DGS design by reducing the etched out area by 50%. A 2 × 2 DGS integrated array has been designed and experimentally demonstrated in X-band showing 12 dB improvement in the isolation between the copol and cross-pol radiations. © 2002-2011 IEEE.

Defected ground structure integrated microstrip array antenna for improved radiation properties

A new technique to characterize an isolated defected ground structure (DGS) is explored. The technique is used to optimize the dimensions of a compact partial-ring DGS to suppress mutual coupling between two E-plane coupled cylindrical dielectric resonator antennas. The optimized design is verified experimentally using a set of fabricated prototypes operating in S-band. A suppression up to 6-7 dB, showing good agreement with the predicted values, is experimentally demonstrated. © 2012 Elsevier GmbH. All rights reserved.

AEU - International Journal of Electronics and Communications

Stop-band characterization of an isolated DGS for reducing mutual coupling between adjacent antenna elements and experimental verification for dielectric resonator antenna array

Journal	Data powered by TypesetIEEE Antennas and Wireless Propagation Letters
Publisher	Data powered by TypesetIEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
ISSN	1536-1225
Open Access	No