非同轴射频器件测试夹具引入误差的研究

Research on the Errors Introduced by Non-coaxial RF Device Test Fixture

随着射频器件的快速发展,对射频器件S参数测试技术的要求越来越严苛,测试用的矢量网络分析仪的测试连接一般为同轴接口,而器件的输入/输出端口一般不是同轴的。针对于此,一般设计相应的测试夹具,而非同轴射频测试夹具引入的误差较大,不容忽视。在对非同轴测试夹具校准时,必须考虑其引入的误差,因此,对非同轴射频测试夹具引入的误差进行研究是非常有意义的。从矢量网络分析仪的工作原理出发,分析了测试夹具引入的误差来源;研究了反射参数误差模型和传输参数误差模型,通过误差信号流图,分别得出了相应的数学模型,为改善非同轴射频测试夹具的校准技术提供了理论依据。

With the rapid development of RF devices, the rquirements for the testing technology of S parameter of RF devices are becoming more and more stringent. The test connection of the vector network analyzer for testing is generally a coaxial interface, but the input/output port of the device is generally not coaxial. In view of this, it is generally necessary to design a corresponding test fixture, but the error introduced by the non-coaxial RF test fixture is large and cannot be ignored. When calibrating a non-coaxial test fixture, the error introduced by it must be considered. Therefore, it is very meaningful to study the error introduced by the non-coaxial RF test fixture. Based on the working principle of vector network analyzer, the error sources introduced by test fixture are analyzed. And the error model of reflection parameters and the error model of transimission parameters are studied. Besides, the corresponding mathematical models are obtained respectively through the error signal flow diagram, which provides a theoretical basis for improving the calibration technology of the non-coaxial RF test fixture.