scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

A new feed conceived for exciting HEM12δ mode in a cylindrical DRA

TL;DR: In this article, a new feed to excite a cylindrical dielectric resonator antenna (CDRA) with HEM12δ mode has been conceived and demonstrated in this paper for the first time.
Abstract: A new feed to excite a cylindrical dielectric resonator antenna (CDRA) with HEM12δ mode has been conceived and demonstrated in this paper for the first time. This uses an aperture-fed dielectric resonator as a feed to a CDRA and results in much improved bandwidth along with attractive radiation characteristics. As much as 7.6 dBi peak gain has been documented. This investigation adds a new feeding technique satisfying the boundary condition required for the modal fields and appears as a superior alternative to the earlier feeding techniques.
Citations
More filters
Proceedings ArticleDOI
01 Aug 2017
TL;DR: In this article, the authors proposed a new feeding scheme for exciting a higher-order resonant mode in cylindrical dielectric resonator antennas, which comprises a nonresonant microstrip patch connected to a narrow microstrip line by means of an inset.
Abstract: This paper proposes a new feeding scheme for exciting a higher-order resonant mode in cylindrical dielectric resonator antennas. The proposed feeding structure comprises a nonresonant microstrip patch connected to a narrow microstrip line by means of an inset. Both the microstrip patch and line are located under the antenna radiating element (dielectric resonator). A parametric analysis of this feeding structure has been carried out using electromagnetic simulation. The results of this analysis indicate that the antenna impedance matching can be adjusted by changing the length of the inset, and that different values of directivity and impedance bandwidth can be obtained by using different microstrip patch sizes and inset lengths. An antenna prototype has been designed and fabricated to validate the proposed feeding structure using a dielectric resonator with a high dielectric constant. The measured resonance frequency and impedance bandwidth of this prototype are 6.20 GHz and 25.0 MHz (fractional bandwidth of 0.403%), respectively, showing good agreement between simulated and experimental results.

2 citations


Cites background from "A new feed conceived for exciting H..."

  • ...It shows a directional radiation pattern whose direction of maximum radiation is orthogonal to the ground plane, as expected for a cylindrical dielectric resonator antenna operating in the HEM12δ mode [4]–[11]....

    [...]

  • ...Some other feeding structures that are able to properly excite the HEM12δ mode have been reported [6]–[11]....

    [...]

Proceedings ArticleDOI
01 Apr 2017
TL;DR: In this article, a coaxial-probe (centered) excited stacked dielectric resonator antenna (DRA) structure is rigorously analyzed from the modal perspective, which can be used to explain the broadband nature of the coupling.
Abstract: In this paper, a coaxial-probe (centered) excited stacked dielectric resonator antenna (DRA) structure is rigorously analyzed from the modal perspective The design analyzed in this paper is a stacked structure with 3 boxes of different dielectric materials and dimensions out of which 2 boxes are placed adjacent and are stacked on the 3rd box Also, the modes of the DRA structure can be identified from the analysis, which can be used to explain the broadband nature of the coupling [1] The bandwidth enhancement is seen due to a combination of several DRA modes Frequency tuning of the antenna structure is also demonstrated by exciting the antenna at higher order modes, TM 01δ , HEM 11δ and HEM 12δ , maintaining the broadband characteristics of bandwidth 29GHz The radiation characteristics of the antenna are also investigated The obtained result shows, reflection coefficient of −20dB at a resonant frequency of 982GHz with a band gain of 9023dB

Cites background from "A new feed conceived for exciting H..."

  • ...This makes them suitable for integration into different planar technologies [3][4][5]....

    [...]

References
More filters
Journal ArticleDOI
TL;DR: In this article, an experimental investigation of the radiation and circuit properties of a resonant cylindrical dielectric cavity antenna has been undertaken, and a simple theory utilizing the magnetic wall boundary condition is shown to correlate well with measured results for radiation patterns and resonant frequencies.
Abstract: An experimental investigation of the radiation and circuit properties of a resonant cylindrical dielectric cavity antenna has been undertaken. The radiation patterns and input impedance have been measured for structures of various geometrical aspect ratios, dielectric constants, and sizes of coaxial feed probes. A simple theory utilizing the magnetic wall boundary condition is shown to correlate well with measured results for radiation patterns and resonant frequencies.

1,434 citations


"A new feed conceived for exciting H..." refers background in this paper

  • ...INTRODUCTION Ever since CDRA started its journey in 1983[1], it has become the most popular shape in use....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a cylindrical dielectric resonator antenna (CDRA) has been examined with a view for using it as another radiating mode with broadside radiation patterns.
Abstract: A resonant mode (HEM12δ), other than those ( HEM11δ and TM01δ) conventionally excited and used in a cylindrical dielectric resonator antenna (CDRA) has been examined with a view for using it as another radiating mode with broadside radiation patterns. Excitation of the mode, being the most challenging aspect, has been discussed and resolved by employing an innovative technique. The proposed concept has been successfully verified and experimentally demonstrated for the first time. More than 8-dBi peak gain with excellent broadside radiation has been obtained from a prototype shaped from a commercially available low-loss dielectric material with relative permittivity 10.

132 citations


"A new feed conceived for exciting H..." refers background in this paper

  • ...However nowadays researchers are searching for new higher order modes of practical interest; HEM12δ mode is one of the efficient one since 2012 [2]....

    [...]

Journal ArticleDOI
TL;DR: In this article, 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.
Abstract: 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 ${\rm HEM}_{{12\delta}}$ 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 ${\rm HEM}_{{11\delta}}$ mode and ${\rm HEM}_{{12\delta}}$ mode, respectively; and hence (iii) to achieve a dual-mode dualband CDRA without compromising in any enlargement of antenna dimension. ${\rm HEM}_{{12\delta}}$ 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.

64 citations

Journal ArticleDOI
TL;DR: In this paper, 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.
Abstract: Higher-order HEM12δ mode has been experimentally realized in a cylindrical dielectric resonator antenna (CDRA) very recently revealing broadside radiation like the dominant HEM11δ mode. 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.

59 citations


"A new feed conceived for exciting H..." refers methods in this paper

  • ...The limitations of HEM12δ mode were discussed in [3]-[4]....

    [...]

01 Jan 2015

17 citations


"A new feed conceived for exciting H..." refers methods in this paper

  • ...The limitations of HEM12δ mode were discussed in [3]-[4]....

    [...]