小型整体径向传输线的设计与实验

Design and experiment of small monolithic radial transmission line

设计了一个小型整体径向传输线并对其传输特性进行了实验研究。该传输线由两块相距1cm的铝合金平板组成,其特征阻抗采用双曲线型。1个输出端口位于传输线中央,20个输入端口均匀分布在传输线的外圆周上,最多可供20路脉冲同时注入。此传输线浸没于去离子水中,其单向传输时间为15ns。负载由20个154Ω的电阻并联而成,以保证输出端的阻抗匹配。实验测得的输出电压波形与3维电磁场仿真结果非常接近。此外,还通过实验研究了不同驱动脉冲路数情况下小型整体径向传输线的输出电压,发现在驱动脉冲路数较少的情况下,输出电压的幅值几乎正比于驱动脉冲的路数。

An experimental system of a small monolithic radial transmission line is established.This line with hyperbolic characteristic impedance is composed of 2aluminium-alloy plates with a distance of 1cm.One output port is placed at the center,while 20 input ports are placed uniformly at the outer circumference.Therefore,the maximum number of input pulses of this line is 20.The line is entirely immersed into deionized water,which makes its one-way transmit time 15 ns.The matched load is composed of 20 154Ωin parallel.The output voltage obtained in experiment is very close to the result of 3-dimensional electromagnetic simulation.Moreover,by investigating the output voltage with different numbers of input pulses,it is found that the amplitude of the line's output voltage is nearly proportional to the number of input pulses when the number of input pulses is small.