输入电抗器可滤谐波保护变频器。

The choke protects the converter input.

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同时研究了引线及顶线的各项参数变化对天线的有效高度、增益、输入电抗、辐射电阻及静电容的影响。

The affection of parameter variation of down lead wires and top loading wires on effective height, radiation pattern, input reactance, radiation resistor and static capacitance is discussed.

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研究表明，增加引线数目、引线间距和加长顶线长度均可以增加天线系统的静电容，减小输入电抗的模值，并使天线的增益有所改善。

It is hold that one can increase static capacitance, reduce mode of input reactance and enhance the antenna gain by increasing down lead wires, their distances or lengthening the top loading wires.

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