天线输入阻抗是个极易变化的参数，而传统的手工匹配技术很难对动态负载做到实时、快速的匹配，限制了RFID技术在很多领域的应用。
Traditional manual matching technology is difficult to statify dynamic load impedance immediately and fast, which largely limit the RFID technology applications in many fields.
由于该天线的输入阻抗随频率而变化，需要用一个宽带变负载阻抗匹配网络来实现天线与电台之间的匹配。
The impedance matching network of changeable load and wide-belt is required because the input impedance of spiral antenna changes with frequency.
由于该天线的输入阻抗随频率而变化，需要用一个宽带变负载阻抗匹配网络来实现天线与电台之间的匹配。
The impedance matching network of changeable load and wide-belt is required because the input impedance of spiral antenna changes with frequency.
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