交叉缝隙馈电双频圆极化介质谐振器天线.doc

文档介绍：
交叉缝隙馈电双频圆极化介质谐振器天线#
张萌,李斌**
(北京理工大学信息与电子学院,北京 100081)
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摘要:本文对一种交叉缝隙馈电双频带圆极化矩形介质谐振器天线进行了研究。该介质天线
的长宽比为 :1,基模 TE111,高次模 TE121 和 TE131 的谐振频率相互靠近。通过交叉缝隙馈
电,三个圆极化模式被激励起来。模式 TE111 和 TE121 融合在一起,组成了低频带;模式 TE131
构成了高频带。低频带和高频带的 3-dB 轴比带宽分别为 % (- GHz)和 %
(– GHz)。有趣的是,在低频带,主极化是左旋圆极化;而在高频带,主极化是右旋
圆极化。为了验证仿真的正确性,对天线进行了测量,测量结果和仿真结果合理吻合。
关键词:介质谐振器天线;单馈;双频带;圆极化
中图分类号:TN826
Cross-slot-coupled Dual-band Circularly Polarized
Rectangular Dielectric Resonator Antenna
ZHANG Meng, LI Bin
(School of Information and Electronics, Beijing Institute of Technology, Beijing 100081)
Abstract: A cross-slot-coupled dual-band circularly polarized (CP) rectangular dielectric resonator
antenna is investigated in this letter. The rectangular DRA has a aspect ratio of :1, which makes
the resonant frequencies of the fundamental TE111 mode, the higher-order TE121 and TE131 modes
close to each other. By feeding the DRA with a cross-slot, three CP modes are excited. The CP
modes TE111 and TE121 merge together, composing the lower band, while TE131 poses
the upper band. The simulated 3-dB axial ratio (AR) bandwidths (AR< 3dB) are % ( -
GHz) and % ( – GHz) for the lower and upper bands, respectively. Interestingly,
it is found that the left-handed CP field is excited in the lower band, while the right-handed CP