Method for measuring circular polarization antenna axial ratio by utilizing linear polarization antenna

Abstract

The invention relates to a method for measuring a circular polarization antenna axial ratio by utilizing a linear polarization antenna. The method is characterized in that the linear polarization antenna with a known polarization direction is selected to be an auxiliary antenna in a microwave unreflected chamber, polarization states of the linear polarization antenna are sequentially enabled to be the same with four polarization directions of x, y, u and v, the antenna directional graph measuring is carried out on a to-be-measured circular polarization antenna in four polarization states of the auxiliary antenna, radiation values of Ex (theta), Ey (theta), Eu (theta), Ev (theta) of the to-be-measured antenna are obtained, an inclination angle of the to-be-measured circular antenna is calculated, and an axial ratio AR (theta) of the to-be-measured polarization antenna is obtained. According to the method, a linear polarized horn antenna is adopted to be the auxiliary antenna, the polarization direction of the linear polarized horn antenna is easily determined, the measuring time is reduced, and the test difficulty is lowered; and the auxiliary antenna is in a static state, so that the affects from uncontrollable factors are reduced, and the obtained information of the circular polarization antenna axial ratio is enabled to be realer and more reliable.

Description

technical field [0001] The invention belongs to the field of antenna testing, and in particular relates to a method for measuring the axial ratio of a circularly polarized antenna by using a linearly polarized antenna. Background technique [0002] In the circularly polarized antenna test, it is necessary to measure the axial ratio of the circularly polarized antenna to judge whether the degree of circular polarization of the circularly polarized antenna meets the design requirements. The rotating source method uses a linearly polarized antenna that can rotate rapidly in the same polarization plane as an auxiliary antenna, and at the same time adjusts the azimuth turntable where the circularly polarized antenna to be tested to an appropriate speed, so that a more realistic axial ratio can be obtained. information. However, because the rotary joint of the polarization turntable cannot completely eliminate the amplitude and phase changes caused by the cable jitter caused by t...

AI Technical Summary

Problems solved by technology

However, because the rotary joint of the polarization turntable cannot completely eliminate the amplitude and phase changes caused by the cable jitter caused by the rotation, especially in the high frequency band, this phenomenon is particularly obvious, which will bring errors to the test

At the same time, because the standard circularly polarized antenna is not easy to manufacture, the circularly polarized antenna is usually not used as an auxiliary antenna for accurate measurement

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