New Aperture Coupling Technique for Dielectric Resonator Antenna to Reduce Cross-Polarized Fields
01 Dec 2018-
TL;DR: In this paper, a composite dual-aperture feeding technique for conventional cylindrical dielectric resonator antenna (CDRA) has been proposed to design dual-band antenna using $\mathbf{HEM}_{11\boldsymbol{\delta}}$ and $\mathBF{Hem}_{ 11\mathbf{\Delta}}$ modes.
Abstract: A composite dual-aperture feeding technique for conventional cylindrical dielectric resonator antenna (CDRA) has been proposed to design dual-band antenna using $\mathbf{HEM}_{11\boldsymbol{\delta}}$ and $\mathbf{HEM}_{11\mathbf{\Delta}}$ 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.
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TL;DR: In this article, a dual-mode cylindrical DRA was proposed for both linearly and circularly polarized cases, where the covariance matrix adaptation evolutionary strategy (CMA-ES) was used to determine the dimensions of the DRA.
Abstract: Linear-/circular-polarization designs of the dual-/wide-band cylindrical dielectric resonator antennas (DRAs) are presented. The HEM111 and HEM113 modes of the cylindrical DRA are utilized to design the dual-mode cylindrical DRA. A wideband antenna can be obtained by merging the two resonant modes. To facilitate the designs, new engineering formulas that determine the dimensions of the dual-mode cylindrical DRA are found for the first time. They are obtained by using the covariance matrix adaptation evolutionary strategy (CMA-ES). Design examples for the dual-/wide-band cylindrical DRAs are given for both the linearly and circularly polarized cases. Ansoft HFSS was used to simulate the DRAs and the simulations were verified with our measurements. Good agreement between the measured and simulated results is observed.
137 citations
TL;DR: In this paper, an investigation on increasing the bandwidth of dielectric resonator antennas by changing the radius to height and length to height ratios for cylindrical and rectangular geometries, respectively, was conducted.
Abstract: An investigation is conducted on increasing the bandwidth of dielectric resonator antennas by changing the radius-to-height and length-to-height ratios for cylindrical and rectangular geometries, respectively. A bandwidth of 30% is experimentally verified
67 citations
TL;DR: In this paper, a new and physically realizable feed employing a dielectric resonator (DR) has been conceived and demonstrated for the 12-Delta mode in a cylindrical DRA, which enables in realizing an improved version of dual-band dual-mode DRA with attractive broadside radiation along with wide bandwidth characteristics.
Abstract: A new and physically realizable feed employing a dielectric resonator (DR) has been conceived and demonstrated for ${\rm HEM}_{12\delta}$ 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 $({\rm HEM}_{12\delta})$ , whereas the lower mode $({\rm HEM}_{11\delta})$ 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.
34 citations
01 Jan 2015
17 citations
"New Aperture Coupling Technique for..." refers background in this paper
...Cylindrical dielectric resonator antenna (DRA) plays an important role in designing these kinds of antennas using suitable modes [1]-[5]....
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