基于定向耦合器的高动态范围矢量阻抗测量模块设计

Design of High-Dynamic-Range Vector Impedance Measurement Module Based on Directional Coupler

针对高动态范围矢量阻抗测量模块的设计难点,文中采用定向耦合器结合高动态范围射频(Radio Frequency,RF)对数放大器,设计了一种基于定向耦合器的矢量阻抗测量模块。设计给出了软硬件设计框架,推导了该模块的数学原理,完成了模块实验验证与测试。该设计充分利用了定向耦合器的特点,所实现的测试系统体积小且可扩展性好,测试速度快、效率高。该设计也可扩展为监控测量模块,应用于通信设备中,作为通信发射机的天线监测部件或功率强度控制部件。在实验验证后,利用此设计方案开发了多款实际应用。利用文中设计的高动态范围覆盖了从20~400 W的使用场景,取得了良好的应用效果,证明所提设计具有良好的应用与扩展性以及较高的实用价值。

In view of the design difficulties of the vector impedance measurement module with a high dynamic range,this study designs a vector impedance measurement module based on the directional coupler using the directional coupler combined with the high-dynamic-range RF(Radio Frequency)logarithmic amplifier.The hardware and software design framework is given,the mathematical principle of the module is deduced,and the experimental verification and testing of the module are completed.The design makes full use of the characteristics of directional coupler,and the test system is small in size,good in scalability,fast in test speed and high in efficiency.The design can also be extended to a monitoring and measuring module,which can be used in communication equipment as an antenna monitoring component or power intensity control component of communication transmitter.After the verification,a number of practical applications have been developed using this design scheme.The high dynamic range of the proposed designed covers the application scenarios from 20~400 W,and obtains good application effect,which proves that the proposed design has good application,expansibility and high practical value.