Metamaterial-Based Low-Profile Broadband Mushroom Antenna
Metamaterial-Based Low-Profile Broadband Mushroom Antenna
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DOI：
10.1109/tap.2013.2293788
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发表时间：
2014-03-01
影响因子：
5.7
通讯作者：
Qing, Xianming
中科院分区：
文献类型：
--
作者：
Liu, Wei;Chen, Zhi Ning;Qing, Xianming
提出了一种基于超材料的宽带低轮廓蘑菇天线。所提出的天线由蘑菇单元阵列和地平面组成，并由微带线馈电，通过在地平面上切割的槽来馈电。当馈电槽位于蘑菇细胞之间的中心缝隙正下方时，双共振模同时被激发，用于在瞄准镜下进行辐射。应用传输线模型结合左右手复合蘑菇结构的色散关系对模式进行了分析。该天线的低剖面为0.06lambda(0)(lambda(0)为自由空间的工作波长)，地平面为1.10lambda(0)x 1.10lambda(0)，在5 GHz频段获得了25%的测量带宽(垂直条S-11垂直条)，平均增益为9.9dBI。在整个带宽上，天线效率大于76%，交叉极化电平小于-20分贝。
A metamaterial-based broadband low-profile mushroom antenna is presented. The proposed antenna is formed using an array of mushroom cells and a ground plane, and fed by a microstrip line through a slot cut onto the ground plane. With the feeding slot right underneath the center gap between the mushroom cells, the dual resonance modes are excited simultaneously for the radiation at boresight. A transmission-line model integrated with the dispersion relation of a composite right/left-handed mushroom structure is applied to analyze the modes. The proposed dielectric-filled (epsilon(r) = 3.38) mushroom antenna with a low profile of of 0.06 lambda(0) (lambda(0) is the operating wavelength in free space) and a ground plane of 1.10 lambda(0) x 1.10 lambda(0) attains 25% measured bandwidth (vertical bar S-11 vertical bar < -10dB) with 9.9-dBi average gain at 5-GHz band. Across the bandwidth, the antenna efficiency is greater than 76%, and cross-polarization levels are less than -20 dB.