Overcoming the Chu lower bound on antenna Q with highly dispersive lossy material
Overcoming the Chu lower bound on antenna Q with highly dispersive lossy material
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利用高色散有损材料克服天线 Q 值的 Chu 下限
DOI：
10.23919/eucap.2017.7928427
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
A. Yaghjian
中科院分区：
文献类型：
--
作者：
A. Yaghjian
本文通过电小天线的RLC电路模型证明，由“Q能量”得到的隔离谐振品质因数比“等效电路”或“电动”能量更准确地预测其带宽。此外，它被证实，Q-能量不能被认为是高色散损耗材料中的储能。尽管如此，使用含有高色散损耗材料的调谐元件，50%效率的电小偶极天线的带宽可以被设计为具有由Chu下限预测的50%效率天线的品质因数的带宽的两倍。
It is demonstrated by means of RLC circuit models of electrically small antennas that their isolated-resonance quality factors obtained from the “Q-energy” predicts their bandwidths with greater accuracy than the “equivalent-circuit” or the “elec-trodynamic” energies. Moreover, it is verified that the Q-energy cannot be considered stored energy in highly dispersive lossy material. Nonetheless, using tuning elements containing highly dispersive lossy material, the bandwidth of fifty-percent efficient electrically small dipole antennas can be designed with twice the bandwidth predicted by the Chu lower bound for the quality factor of fifty-percent efficient antennas.