基于ADS的微带线不连续性分析与应用

Analysis and Application of Discontinuity of Microstrip Based on ADS

射频电路印制电路板(PCB)中出现的微带线拐角是微带线不连续结构之一,而微带线的不连续性会影响信号传输质量。为降低微带线不连续性对信号传输质量的影响,利用ADS(Advanced Design System)软件对不同拐角进行仿真,从两个角度分析了它们对电路性能的影响。在此基础上,将研究结果应用于5.8 GHz RFID(Radio Frequency Identification)阅读器射频电路中,取得了较为理想的效果。结果表明:45°外斜切直角拐角和圆弧拐角均能对传输线的不连续性进行补偿,其中,45°外斜切直角拐角存在最佳斜切率M,使拐角处信号的传输特性(即回波损耗和插入损耗)最优。该研究对降低微带线不连续性对信号传输质量的影响具有一定的指导意义。

The bend of the microstrip is one of the discontinuous structures in radio frequency （RF） PCB （Printed Circuit Board）, and the discontinuity of a transmission line will influence the quality of signal transmission. To reduce the damage, this paper uses ADS （Advanced Design System） software to simulate and analyze the influence of different bends on the circuit performance. And the research results have been successfully applied to the 5.8GHz RFID （Radio Frequency Identification） reader RF circuits. The results show that both the 45 degree out miter and circular arc bend can compensate the discontinuity. Especially, the 45 degree out miter bend has an optimum percentage miter M, which can optimize the return loss and insert loss at the microstrip bend. The study has certain guidance on reduction of the effect of the discon-tinuous structure on the quality of signal transmission.