中文摘要：

Ba2Co1.8Cu0.2Fe12O22 (Co2Y ) 和 Ba3Co2Fe23.4Zn0.6O41 (Co2Z ) 的电磁的性质被测量散布参数的微波学习。在 Ba2Co1.8Cu0.2Fe12O22 的传播系列，一个禁止的乐队由于铁磁性的回声，和渗透愿望拐弯出现到在铁磁性的回声频率的附近否定。在 Ba3Co2Fe23.4Zn0.6O41 的复杂介电常数系列，否定介电常数能由于绝缘的回声被获得。因此， Co2Y 和 Co2Z 能被用来构造同时拥有否定渗透和否定介电常数的左手的材料。

英文摘要：

The electromagnetic properties of Ba2Co1.8Cu0.2Fe12O22 （Co2Y） and Ba3Co2Fe23.4Zn0.6O41 （Co2Z） were studied by measuring microwave scattering parameters.In the transmission spectra of Ba2Co1.8Cu0.2Fe12O22,a forbidden band emerges due to ferromagnetic resonance,and the permeability will turn to negative in the vicinity of the ferromagnetic resonance frequency.In the complex permittivity spectra of Ba3Co2Fe23.4Zn0.6O41,the negative permittivity can be obtained due to dielectric resonance.Therefore,Co2Y and Co2Z can be used to construct left-handed materials possessing negative permeability and negative permittivity simultaneously.