Split-Ring Resonator Structure Electrically Small Antenna
Date Issued
2011
Date
2011
Author(s)
Chiou, Min-Da
Abstract
This paper proposes two antenna designs of planar split ring resonator (SRR) structure fed by coplanar grounded waveguide. In the first design, we use a small loop to feed the SRR structure antenna, so the bandwidth and efficiency are improved from the precious design. In order to eliminate ground size effect, we propose another design, using a slot to present SRR structure. Both designs were designed to match to 50 ohms, and the geometric dimensions are both at about (1⁄20) λ_0×(1⁄20) λ_0.
To compare with well-proposed designs, we use the quality factor and the Chu-limit to analyze various electrically small antennas which work on separate frequency; therefore, we obtain the advantage of our design comparing to the well-proposed designs. Since various definitions of Quality factor and various derivations of Chu-limit under different assumptions have been considered at previous works, we direction different researches, and unify the definition on quality factor to their results. Moreover, by summarizing these results, we illustrate the physical meaning of these hypotheses, thus some novel perspectives on designing electrically small antenna are proposed.
Subjects
Electrically small antenna
slot antenna
Type
thesis
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