The impedance matchingnetwork 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。
2
Antenna power Input an FCC term for the RF peak or RMS power supplied to the antenna from its associated transmission line and matchingnetwork.
天线功率输入FCC术语，由天线相关发射线路及匹配网络提供给天线的射频峰值功率或均方根功率。
3
Balanced micro-strip line is utilized as feed line, printed dipole is adopted as radiation element, and a matchingnetwork is employed for tuning the input impedance of the antenna.