This type of antenna measurements can be translated into measuring the inputimpedance of two-port network.
而这类天线可以等效成相参激励下二端口网络来进行输入阻抗的测量。
2
The impedance matching network of changeable load and wide-belt is required because the inputimpedance 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。
3
Balanced micro-strip line is utilized as feed line, printed dipole is adopted as radiation element, and a matching network is employed for tuning the inputimpedance of the antenna.