Superdirective Magnetic Dipole Array as a First-Order Probe for Spherical Near-Field Antenna Measurements

被引：56

作者：

Kim, Oleksiy S. ^{[1
]}

Pivnenko, Sergey ^{[1
]}

Breinbjerg, Olav ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Elect Engn Electromagnet Syst, DK-2800 Lyngby, Denmark

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2012年 / 60卷 / 10期

关键词：

Electrically small antennas; first-order probe; magnetic dipole; spherical near-field antenna measurements; superdirectivity; supergain array;

D O I：

10.1109/TAP.2012.2207363

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：

The theory as well as numerical and experimental results are presented for a superdirective array composed of closely spaced electrically small resonant magnetic dipole elements. The array operates on a metal ground plane and can exhibit a maximum directivity of 11.5 dBi, 15.2 dBi, and 17.8 dBi (including 3 dB due to the ground plane), for 2, 3, and 4 magnetic dipoles, respectively. The array is self-resonant and is directly excited by a 50-ohm coaxial cable through the ground plane. The array radiates essentially the vertical bar mu vertical bar = 1 spherical modes, which, despite a narrow bandwidth, makes it an excellent first-order probe for spherical near-field antenna measurements at low frequencies.

引用

页码：4670 / 4676

页数：7

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