A design approach has been explored and successfully demonstrated to achieve an improved gain of a hybrid monopole maintaining its optimum achievable bandwidth. This challenge has been resolved based on the knowledge acquired in earlier investigations. A three-segment composite dielectric ring resonator (DRR) has been designed and fabricated. This, along with a vertical monopole, promises about 137% (5.4:1) matching bandwidth with consistent monopolelike radiation and 6-10-dBi gain over the entire band. Two sets of customized prototypes have been realized and experimentally validated to furnish the predicted characteristics in transmit and receive modes, both in frequency and time domain. © 2017 IEEE.

DEBATOSH GUHA

Radio Physics and Electronics

D GANGULY

S GEORGE

C KUMAR

M SEBASTIAN

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

A New Design Approach for a Hybrid Monopole to Achieve Increased Ultrawide Bandwidth [Antenna Designer's Notebook]

IEEE Antennas and Propagation Magazine

This article describes a new technique for determining an appropriate input pulse and its duration, which are important for time-domain studies of ultra-wideband (UWB) antennas. For such studies, the researchers normally prefer EM simulation tools, and use different types of input pulses. The basis of the choice of input pulse is a bit obscure in most of the reports appearing in the open literature. Antenna researchers indeed face a problem in having suitable guidelines for choosing the input pulse, a mathematical approach to generate it, and in estimating the pulse's duration. The width or duration of the input pulse cannot be arbitrary. This plays a significant role in determining the reliable time-domain response of the antenna in both transmitting and receiving modes. This is successfully addressed in this paper, taking a UWB monopole as the antenna under test. The proposed technique should accurately guide and help a researcher to perform the time-domain characterization of a UWB monopole/dipole antenna using mathematical tools and EM simulators commercially available. © 2014 IEEE.

Systematic approach to estimating monocycle pulse for time-domain studies of UWB antennas using numerical computations and simulation tools

Two geometries of dielectric ring resonator (DRR) have been investigated as new variants for designing ultrawideband hybrid monopole-DRAs (dielectric resonator antennas) with improved features. They are simply hemispherical and conical in shape and have been implemented individually. Hybrid monopole-DRA is actually a combined configuration using a grounded monopole surrounded by a small DRR touching the same ground plane. Compared to an earlier version using cylindrical DRR of same dielectric material, the proposed ones promise for about 25% larger impedance bandwidth maintaining identical gain and radiation properties. As much as 126% impedance bandwidth with consistent monopole type radiation and 2-4 dBi peak gain has been demonstrated using a set of prototypes shaped from dielectric rod with ε r = 10. Physical insight in to the ultrawideband operation along with a comprehensive design guideline is presented. © 2006 IEEE.

IEEE Transactions on Antennas and Propagation

Hybrid monopole-DRAs using hemispherical/conical-shaped dielectric ring resonators: Improved ultrawideband designs

A new pawn-shaped dielectric ring resonator (DRR) fed by a simple quarter-wave monopole has been investigated as a new variant of the hybrid monopole-dielectric resonator antenna (DRA). The new geometry, conceived intuitively, significantly improves the impedance bandwidth compared to all earlier versions reported in open literature. S11 &lt; - 10 dB occurring over 5.5-23 GHz has been experimentally demonstrated, indicating over 4:1 ratio bandwidth, i.e., more than 122% impedance bandwidth around the center of the band. The prototype has been shaped from a dielectric rod with εr = 10. Such ultrawideband (UWB) response is caused by multiple resonances occurring by the hybrid monopole-DRA structure. These resonances are identified through several experimental and simulation studies. Uniform monopole-type radiation occurring over the entire bandwidth has been confirmed using measured and simulated results. The peak gain varies from 4 to 6 dBi as a function of frequency. Such useful properties can be successfully used to realize UWB monopole antennas for wireless communications and as wideband electromagnetic interference (EMI) sensors. © 2009 IEEE.

IEEE Antennas and Wireless Propagation Letters

New pawn-shaped dielectric ring resonator loaded hybrid monopole antenna for improved ultrawide bandwidth

This letter examines in detail multiple resonance phenomenon responsible for the ultra wideband response of the hybrid monopole-dielectric resonator antenna (DRA). The physical insight gained by this investigation has lead to improved guidelines for designing the antennas for any specified frequency band. These simple guidelines are then verified using both simulated and measured data. © 2006 IEEE.

Journal	Data powered by TypesetIEEE Antennas and Propagation Magazine
Publisher	Data powered by TypesetIEEE Computer Society
ISSN	1045-9243
Open Access	No