基于阻尼振荡法的甚低频天线阻抗测量

Measurement Method for the Very Low Frequency Transmitting Antenna Impedance Based on the Damped Oscillation 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,本文提出了一种基于RLC阻尼振荡法的阻抗测量方法,并推导了天线阻抗、电容、电感和电阻的测量公式;该测量方法可通过提高测量电压来提高测量信噪比和测量精度;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,本文提出的测量方法简单可行,具有较高的精度和稳定性,可实现甚低频发射天线输入阻抗的现场测量。

In order to accurately measure the input impedance of very low frequency transmitting antenna in the actual working environment and working frequency point, this paper proposes a method of RLC impedance measurement method based on damped oscillation, and the measurement formula of antenna impedance, capacitance, inductance and resistance are deduced; the measuring method can improve the signal-to-noise ratio and to improve the measurement accuracy by measuring the voltage measurement system;resonance in the working frequency of the antenna under test or near the measured value very low frequency transmitting antenna input impedance is close to the antenna in the actual conditions of the real value. The experimental results show that the proposed method is simple and feasible,has high accuracy and stability, and can realize the field measurement of input impedance of very low frequency transmitting antenna.