宽带连续导体同轴线夹具的研制

Development of a Holder for Broadband Continuous-conductor Coaxial Transmission Line

为弥补现有设备无法满足材料电磁脉冲屏蔽效能测试要求的不足,使用粒子群优化算法结合CST电磁场仿真软件,研制了一种连续导体的宽带同轴线夹具测试装置。该装置采用阶梯过渡段,上限频率达10 GHz,其回波损耗在6.4 GHz以下<-20 dB。使用该装置对一种镀银纤维织物和一种掺金属丝织物进行了频域和时域屏蔽效能测试,并与1.62 GHz同轴线夹具的结果进行了对比。结果表明,使用宽带同轴线夹具测试时,测试样本仅需内径3 mm、外径41 mm的圆环材料,由耦合电容引入的误差更小;在频域测得的插入损耗曲线更平滑,在时域测得的波形受测试夹具的影响更小。

Existing equipment is incapable of measuring materials＇ shielding effectiveness （SE） against electromagnetic pulse in time-domain. Thus, we developed a testing device using broadband continuous-conductor coaxial transmission line holder （CCCH） based on the CST electromagnetic field simulation software and the particle swarm optimization al- gorithm. Adopting ladder transitions, the broadband CCCH has cutoff frequency up to 10 GHz, and return loss less than -20 dB in applications below 6.4 GHz. We used the broadband CCCH and a 1.62 GHz CCCH to measure the SEs by testing a silver-plated fabric and a conductive fabric doped with metal wires in both frequency domain and time domain, and then compared the results. The results reveal that, compared with the 1.62 GHz CCCH, the broadband CCCH requires smaller dimension of test sample, i.e. inside diameter of 3 mm and outside diameter of 41 mm, has smaller error caused by coupling capacitance, obtains smoother insertion loss curves in frequency-domain, and affects less in obtained wave- form in time-domain.