Balanced gain for a square metaloop antenna
Balanced gain for a square metaloop antenna
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DOI：
10.1051/epjam/2018010
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发表时间：
2019
影响因子：
1.6
通讯作者：
H. Nakano;Ittoku Yoshino;T. Abe;J. Yamauchi
中科院分区：
文献类型：
--
作者：
H. Nakano;Ittoku Yoshino;T. Abe;J. Yamauchi
讨论了使用超材料线（称为金属环）实现的方形环形天线。当环周长等于一个导波波长时，金属环会辐射反向圆偏振 (CP) 宽边光束。增益的频率响应显示两个不同的最大值：频率fGLmax处的左手CP波的增益GLmax和频率fGRmax处的右手CP波的增益GRmax，其中GLmax小于GRmax。为了增加 GLmax，同时尽可能不影响原始 GRmax（即平衡增益），在金属环上方的高度 Hpara 处放置一个周长为 fGLmax 处的一个自由空间波长的寄生自然导电环（paraloop）。发现通过选择合适的Hpara可以减小增益的差异。 fGLmax 处的辐射方向图因平行环路而变窄，而 VSWR 并未受到显着影响。
A square loop antenna implemented using a metamaterial line, referred to as a metaloop, is discussed. The metaloop radiates a counter circularly polarized (CP) broadside beam when the loop circumference equals one guided wavelength. The frequency response of the gain shows two different maximum values: gain G Lmax for a left-handed CP wave at frequency fGLmax and gain GRmax for a right-handed CP wave at frequency fGRmax, where GLmax is smaller than GRmax. In order to increase GLmax, while not affecting the original GRmax as much as possible (i.e. balance the gain), a parasitic natural conducting loop (paraloop), whose circumference is one free-space wavelength at fGLmax, is placed at height Hpara above the metaloop. It is found that the difference in the gains can be reduced by choosing an appropriate Hpara. The radiation pattern at fGLmax is narrowed by the paraloop, while the VSWR is not remarkably affected.