Journal ArticleDOI
Comparison of the Radiation Efficiency for the Dielectric Resonator Antenna and the Microstrip Antenna at Ka Band
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TLDR
In this paper, the radiation efficiency of a dielectric resonator antenna (DRA) and a microstrip antenna (MSA) at the Ka band was investigated numerically and experimentally.Abstract:
The radiation efficiency of a dielectric resonator antenna (DRA) and a microstrip antenna (MSA) at Ka band is investigated numerically and experimentally. For direct comparison, one cylindrical DRA and one circular disk MSA were designed with similar feeding networks for operation at around 35 GHz. The efficiency of both devices was measured using the directivity/gain (D/G) method and the Wheeler cap method, in both of which the losses in the test system and the feeding structure were taken into account for calibration purposes. A good agreement between measured and simulated results for both methods is found, when considering the effect of the sampling interval and cross-polarization in the D/G method and the effect of the metallic cap size in the Wheeler cap method. It is finally demonstrated that the radiation efficiency of the DRA is significantly higher than that of the MSA at millimeter wave frequencies.read more
Citations
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Bandwidth-Enhanced Low-Profile Cavity-Backed Slot Antenna by Using Hybrid SIW Cavity Modes
TL;DR: In this paper, a low-profile substrate integrated waveguide (SIW) cavity-backed slot antenna is presented, where two hybrid modes, whose dominant fields are located in different half parts of the SIW cavity are two different combinations of the and resonances.
Journal ArticleDOI
Dielectric Resonator Antennas: From the Basic to the Aesthetic
TL;DR: The basic characteristics of dielectric resonator antennas are explained, with emphasis on the effect of the form factor on their resonance (operating) frequencies.
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Dielectric resonator nanoantennas at visible frequencies
Longfang Zou,Withawat Withayachumnankul,Charan M. Shah,Arnan Mitchell,Madhu Bhaskaran,Sharath Sriram,Christophe Fumeaux +6 more
TL;DR: The designed nonuniform planar DRA array on a metallic plane imparts a sequence of phase shifts across the wavefront to create beam deflection off the direction of specular reflection, and clearly demonstratesbeam deflection at 633 nm.
Journal ArticleDOI
Substrate-Integrated Millimeter-Wave and Terahertz Antenna Technology
TL;DR: Millimeter-wave and terahertz antenna technologies are overviewed including the conventional and nonconventional planar/nonplanar antenna structures based on different platforms with respect to theoretical and experimental results in connection with electrical and mechanical performances.
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A Novel Low-Cost Circularly Polarized Rotated Stacked Dielectric Resonator Antenna
TL;DR: In this paper, a low-cost method for generating circular polarization in a dielectric resonator antenna is proposed, which consists of four rectangular layers, each one being rotated by an angle of 30 degrees relative to its adjacent layers.
References
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Journal ArticleDOI
Planar negative refractive index media using periodically L-C loaded transmission lines
TL;DR: In this article, the authors proposed an alternate perspective on the design and function of such materials that exploits the well-known L-C distributed network representation of homogeneous dielectrics.
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The resonant cylindrical dielectric cavity antenna
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.
Journal ArticleDOI
Theoretical and experimental investigations on rectangular dielectric resonator antennas
TL;DR: In this paper, the resonant frequencies and radiation Q-factors of the lowest order "magnetic-dipole" modes are derived on the basis of a first-order theory.
Journal ArticleDOI
Resonant hemispherical dielectric antenna
M. McAllister,Stuart A. Long +1 more
TL;DR: In this article, an antenna consisting of a resonant dielectric hemisphere on top of a ground plane is investigated, with emphasis on the lowest-order mode that results in efficient radiation in the direction perpendicular to the ground plane.
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Comparison of three methods for the measurement of printed antenna efficiency
David M. Pozar,B. Kaufman +1 more
TL;DR: In this paper, three methods for the measurement of antenna efficiency are evaluated: (1) the Wheeler cap method, (2) the radiometric method, and (3) the directivity/gain method.