Mode-Based Information Channels in Closely Coupled Dipole Pairs

被引:42
作者
Lee, Tzung-I [1 ]
Wang, Yuanxun Ethan [1 ]
机构
[1] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA
基金
美国国家科学基金会;
关键词
Beamforming; mode-based; multiple input multiple output (MIMO); mutual coupling; supergain antennas;
D O I
10.1109/TAP.2008.2007379
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
Information channels supported by two orthogonal radiation modes in a pair of closely spaced dipole antennas are investigated. The radiation impedances of the two modes are closely related to the coupling behavior of the 2-element array as a function of the antenna spacing. Through a multiport impedance matching network, the common and difference modes of the coupled antenna system can be separated into different driving ports. Conjugate match can thus be independently performed for each port, resulting in a fully matched 2-element array. Such a 2-element array with closely spaced antennas can potentially offer a significant array gain or an ideal 2 x 2 multiple input multiple output channel capacity. Full-wave simulations of a pair of half-wave dipoles with 0.1 lambda spacing have demonstrated the feasibility of the approach for narrowband applications. By combining the common mode and difference mode, approximately 3 times of the gain of a single half-wave dipole can be achieved. Experimental validation with a test bed consisting of two lambda/4 monopoles and a rat-race coupler has been carried out. The concept may be extended onto closely coupled antenna systems with different numbers of elements.
引用
收藏
页码:3804 / 3811
页数:8
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