A composite dual-aperture feeding technique for conventional cylindrical dielectric resonator antenna (CDRA) has been proposed to design dual-band antenna using HEM11δ and HEM11δ modes. These two modes with similar kind of electric field patterns have been excited simultaneously in a CDRA with 7 dBi and 9.4 dBi peak gains respectively. This was achieved at two operating frequency bands showing improved radiation pattern with reduced cross-polarized field levels. This technique should find suitable applications in modern dual-band wireless communications. © 2018 IEEE.

DEBATOSH GUHA

Radio Physics and Electronics

P GUPTA

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

New Aperture Coupling Technique for Dielectric Resonator Antenna to Reduce Cross-Polarized Fields

2018 IEEE Indian Conference on Antennas and Propagation, InCAP 2018

A new and physically realizable feed employing a dielectric resonator (DR) has been conceived and demonstrated for HEM12δ mode in a cylindrical dielectric resonator antenna (CDRA). This indeed enables in realizing an improved version of dual-band dual-mode dielectric resonator antenna (DRA) with attractive broadside radiation along with wide bandwidth characteristics. It comprises of a two-element stacked geometry, where the lower element is excited by an aperture and the upper element is excited by the lower DR. The upper element is responsible for generating the higher mode (HEM12δ), whereas the lower mode (HEM11δ) resonates in the entire composite mass. The conjecture has been verified with an S/C-band design using simulated and measured results indicating three different variants. The most improved geometry comprising of a "cone on top of a cylinder" promises 6.5 and 10.3 dBi gains in the lower and upper operating bands with, respectively, 8.3% and 13% matching bandwidth. This newly addressed technique can be of potential use for newer innovations in DRA feed and design. © 2016 IEEE.

IEEE Transactions on Antennas and Propagation

Dielectric Resonator Working as Feed as Well as Antenna: New Concept for Dual-Mode Dual-Band Improved Design

A composite aperture has been conceived to excite cylindrical dielectric resonator antenna (CDRA) simultaneously with two different modes, resulting in broadside radiations at two adjacent bands. Threefold objectives of this investigation includes: (i) to realize HEM12δ mode in a practical CDRA without involving any unwanted hybrid mode; (ii) to explore composite aperture type feed, which serves as equivalent magnetic and electric dipoles to launch HEM11δ mode and HEM12δ mode, respectively; and hence (iii) to achieve a dual-mode dualband CDRA without compromising in any enlargement of antenna dimension. HEM12δ mode is a recent introduction by the present authors as a broadside radiating mode in a CDRA, although this investigation demonstrates a practically feasible application for the first time. Systematic study of newly proposed composite aperture is followed by experimental investigation with a set of prototypes operating at S and C bands. As much as 6 dBi gain with 7-8% matching bandwidth for each operating band has been experimentally demonstrated. © 2014 IEEE.

Dualband cylindrical dielectric resonator antenna employing HEM11Î´ and HEM12Î´ modes excited by new composite aperture

Higher-order {\rm HEM}12 \deltamode has been experimentally realized in a cylindrical dielectric resonator antenna (CDRA) very recently revealing broadside radiation like the dominant {\rm HEM}11 \deltamode. The primary challenge is the excitation of the mode in a practical DRA sitting on a metal ground plane, which was first resolved by introducing a floating feed as an equivalent current ribbon. In this letter, yet another technique has been explored using a conventional probe-fed CDRA placed on a metal plate. Only a new trough-shaped air cavity has been introduced in the ground plane just beneath the DRA to simulate a special boundary condition, which enunciates desired modal fields. Such a technique may be improvised for other potential applications. The proposed concept has been verified using both simulated and experimental results. © 2002-2011 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