The circuit design is carried out by taking chip of RF-ID U2270B as core, including power module, frequency module, antenna module and data input;
采用以射频卡U2270B器件为核心完成支撑电路设计，包括电源模块、频率模块、天线模块和数据输入；
Combination of ladder approach method and equivalent circuit model of slot antenna had been used to analyze its input impedance. Finally, GTD had been used to calculate the radiation pattern.
利用阶梯近似方法结合缝隙天线电路模型分析其输入阻抗，最后采用GTD方法计算该种天线的辐射方向图。
Combination of ladder approach method and equivalent circuit model of slot antenna had been used to analyze its input impedance. Finally, GTD had been used to calculate the radiation pattern.
利用阶梯近似方法结合缝隙天线电路模型分析其输入阻抗，最后采用GTD方法计算该种天线的辐射方向图。
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