Measurement method for insertion loss of two-port far reciprocal feeder that can reduce measurement error

Abstract

The invention discloses a method for measuring insertion loss of feeder line switching between two distant ports and enabling measuring errors to be smaller. The method is characterized in that only one port of a vector network analyzer is used for testing return loss caused when the tail end of a feeder line is connected with a matched load or a short-circuit or open-circuit module, then, return loss caused when the initial end of the feeder line is connected with a matched load is measured, and insertion loss of the feeder line is obtained through formula computing. Strict theoretical derivation is carried out on the method, the method has no theoretical errors, and measuring accuracy of the method depends on instrument accuracy. Devices used in cooperation with the method are the matched loads, and the short-circuit or open-circuit module, and the devices are the same as calibration parts of the vector network analyzer, do not need to be purchased separately, and are convenient to carry and use. The method can be integrated in the vector network analyzer, all the test intermediate quantities are stored in the vector network analyzer, then, formula computing is completed through the vector network analyzer, and finally the measuring result of insertion loss is directly output.

Description

technical field [0001] Feeder is a general term for transmission lines, components and networks that control electromagnetic signals. The invention relates to a method for measuring the insertion loss of a reciprocal two-port feeder, which is suitable for the measurement of the insertion loss of various reciprocal two-port feeders, and is especially suitable for the feeder ports that are far apart even when the two ports of a network analyzer cannot be directly measured. The case of port feeder insertion loss. The invention belongs to the field of microwave measurement. Background technique [0002] The feeder lines are complex and huge, such as sky-wave and ground-wave radar antenna-feeder lines can be laid for thousands of meters. Insertion loss is an important parameter to measure the electrical performance of the feeder. Generally, the dual-port of the network analyzer is used to measure the insertion loss of the two-port feeder. But for the reciprocity feeder whose t...

AI Technical Summary

Problems solved by technology

[0005] The present invention focuses on the method for reducing the insertion loss measurement error of a reciprocal feeder with two ports far away, so as to solve the problem of large error in the insertion loss measurement of two ports using a three-terminal circulator and a network analyzer

The method itself is applicable to various reciprocal two-port feeders

Images