A method to measure the voltage standing wave ratio of a component with nonstandard interface

A method to precisely measure the voltage standing wave ratio(VSWR) of a component with nonstandard interfaces, named directional coupler method, is put forward in the paper. The measurement principle of the method is presented, and the errors by the method are analyzed. The errors relate to the directivity of the coupler and the VSWR of the component.The method is used to measure a matching load with nonstandard interfaces. The experimental results(VSWR value is less than 1.2) are achieved. The results prove that the method is feasible. The method has eased the problems of measuring the VSWR of a component with nonstandard interfaces, which is commonly involved in the researches of high power microwave.