A method for measuring the complex cross-polarization ratio using two identical antennas under test

Abstract

The invention discloses a method for measuring a complex cross polarization ratio by using two identical to-be-measured antennas, and relates to a method for measuring the cross polarization ratio ofan antenna. A first to-be-measured antenna (10) and a second to-be-measured antenna (11) which have the same structure and performances, a measuring instrument (20) and a cable (21) are used. A test is carried out in a microwave anechoic chamber (3). The first to-be-measured antenna (10) and the second to-be-measured antenna (11) are arranged in a far field area; the measuring instrument (20) is connected to the first to-be-measured antenna and the second to-be-measured antenna through the cable (21); the second to-be-measured antenna is used as a receiving antenna, a plurality of attenuationfactors are acquired during polarization matching and polarization orthogonality, and a plurality of cross polarization ratios of the second to-be-measured antenna are calculated according to the attenuation factors; the to-be-measured antennas are taken as receiving antennas, the complex cross polarization ratio of the first to-be-measured antenna is measured, and a measurement value of the complex cross polarization ratio through averaging. According to the method, a reference antenna is omitted, the measurement is simplified, and errors caused by the environment are reduced through multiple times of measurement.

Description

technical field [0001] The invention relates to an antenna measurement method, in particular to a measurement method using the cross polarization ratio of two identical antennas to be tested. Background technique [0002] As a parameter of the antenna, the cross-polarization ratio plays a key reference role in the application design of multiple-input multiple-output antenna arrays, dual-polarized antennas, and polarization multiplexing systems. Measuring the antenna cross-polarization ratio is a non-negligible step when measuring antennas with high polarization isolation. But in the actual antenna measurement, the antenna with low cross-polarization ratio is difficult to measure accurately due to the small cross-polarization component. Existing cross-polar ratio measurement methods require a reference antenna. In order to ensure measurement accuracy, the cross-polarization ratio of the reference antenna is required to be much lower than that of the antenna under test. [...

AI Technical Summary

Problems solved by technology

[0003] In this existing antenna cross-polarization ratio measurement method, when the cross-polarization ratio of the reference antenna is higher than that of the antenna under test, the cross-polarization ratio of the antenna under test cannot be accurately measured.

If the cross-polarization performance of the antenna under test is excellent, it is difficult to find a reference antenna with a smaller cross-polarization than the antenna under test in the same frequency band, and its cost is also high, which increases the difficulty of measurement and the complexity of the measurement system.

At the same time, when the cross-polarization of the antenna under test is small, the imperfection of the darkroom environment and the measurement device will have a great impact on the measurement accuracy

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