Low-Q Electrically Small Spherical Magnetic Dipole Antennas

被引：83
|
作者：
Kim, Oleksiy S. [1 ]
机构：
[1] Tech Univ Denmark, Dept Elect Engn, DK-2800 Lyngby, Denmark
来源：
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2010年 / 58卷 / 07期
关键词：
Chu limit; electrically small antennas; quality factor; magnetic dipole; split-ring resonator (SRR); surface integral equation; RADIATION Q; LIMITS;
D O I：
10.1109/TAP.2010.2048863
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Three novel electrically small antenna configurations radiating a TE10 spherical mode corresponding to a magnetic dipole are presented and investigated: multiarm spherical helix (MSH) antenna, spherical split ring resonator (S-SRR) antenna, and spherical split ring (SSR) antenna. All three antennas are self-resonant, with the input resistance tuned to 50 ohms by an excitation curved dipole/monopole. A prototype of the SSR antenna has been fabricated and measured, yielding results that are consistent with the numerical simulations. Radiation quality factors (Q) of these electrically small antennas (in all cases ka < 0.26) approach the limit of 3.0 times the Chu lower bound for a given antenna size, which is in line with a theoretical prediction made by Wheeler in 1958.
引用
收藏
页码：2210 / 2217
页数：8
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