一种基于RLC串联谐振的甚低频天线阻抗测量方法

Measurement Method for the Very Low Frequency Transmitting Antenna Impedance Based on the RLC Series-resonant Circuit

为了准确测量甚低频发射天线在实际工作环境和工作频点上的输入阻抗,提出了一种基于RLC串联谐振的甚低频发射天线输入阻抗测量方法,推导了甚低频天线输入阻抗、电容、电感和输入电阻的测量公式;这种测量方法可以通过提高测量电压来提高测量的信噪比和测量精度;并且,测量系统谐振于被测天线的工作频点或其附近,使甚低频发射天线输入阻抗的测量值更接近天线在实际工况下的真实值。试验表明,这种测量方法简单可行,具有较高的精度和稳定性,并对甚低频发射天线输入阻抗的现场测量提供了一定的理论和实验指导。

In order to measure the input impedance of a very low frequency（VLF）transmitting antenna in the practical working environment and at the working frequency,a new measurement method based on a RLC series resonant circuit is proposed,and the derivation process of the measuring formulas for the input impedance,the capacitance,the inductance and the input resistance is also described in this paper.The signal-to-noise ratio and the measurement accuracy is improved by improving the measuring voltage,and as the antenna is in resonance at the working frequency point or near it in the measurement system,the measured value of the antenna＇s input impedance is closer to the real one under the practical working condition.The experimental results show that the measuring method is not only simple and feasible,but of higher precision an stability,which provides a certain theoretical and experimental guidance for the input impedance measurement of the VLF transmitting antenna on the spot.