宽带高性能SMA匹配负载的研制

本文介绍一款高性能SMA匹配负载的设计、制作及测试。匹配负载制作难点在于高性能微波电阻选型、过渡段匹配设计及电阻段外导体渐进线设计。本文应用CST仿真软件对产品结构进行整体仿真，优化得到合理结构。仿真中应用TDR模块“看见”结构找到不匹配点。产品测试达到设计目标：DC～18GHz，驻波比小于1.07。测试结果验证设计方法有效性。

Design of a Wideband High Performance SMA Load

This article presents the design and manufacture of a novel SMA wideband load with high performance, and then test it. The emphases of the wideband load design are the choice of the resistance, the match of transition segment, the design of the tractrix of the outer conductor of resistance segment. The structure is simulated using CST software. TDR (Time Domain Reflection) computation is well known from measurement. In simulation the TDR module is the only possibility to “look into a structure” and locate mismatches. It is very precision to design coaxial component. The final structure of this SMA load is fabricated and tested. The measured VSWR of the SMA load is less than 1.07. A good agreement between the simulated and measured results validates the design.