Antenna plane near-field test scanner

Abstract

An antenna plane near-field test scanner adopts a brand-new design and is composed of a direct drive motor (a linear motor for short) serving as a drive element and an industrial personal computer and a position measurer serving as control units, as well as a probe and a PC (personal computer) serving as data sampling units. In an antenna plane near-field test, in particular a millimeter wave antenna test, a space plane is scanned with high precision at a high speed and antenna near-field amplitude-phase data is sampled at the same time. The linear motor is used as the drive element for driving the scanner to move in X and Y directions, a screw rod, a gear wheel, a rack and a speed reducer are not used, a load is directly driven, and an error such as a back clearance is eliminated. The advantage of closed-loop control is brought into fully play, accurate and high-speed positioning is realized, and the needs of the millimeter wave antenna near-field test can be well met.

Description

technical field [0001] The invention relates to a scanning device for antenna plane near-field testing, which can be used in general wave bands, and is especially suitable for millimeter-wave antenna near-field testing, and is a high-precision, high-efficiency antenna plane near-field testing scanner. Background technique [0002] At present, with the continuous development of microwave technology, especially the wide application of millimeter wave, higher requirements are put forward for the scanner in the antenna near-field test: to achieve fast response while ensuring high-precision positioning. Since the wavelength (λ) of the millimeter wave is only 1-10mm, and the sampling point spacing of the planar near-field scanning is required to meet the sampling rate ≤λ / 2, when the scanning area is large, it is necessary to obtain a large amount of dense sampling data. The stepper and servo motor drive methods have deficiencies both in terms of positioning accuracy and sampling s...

AI Technical Summary

Problems solved by technology

[0003] Using stepping or servo motors as the drive requires the use of motion conversion mechanisms such as screw, guide rail, gear, rack, and reduction box, which are likely to cause system errors and need to be corrected by interpolation to further improve accuracy and speed. difficult to achieve

[0004] Using the stepper motor drive method, because the closed-loop control cannot be realized, the improvement of positioning accuracy is limited

In addition, the speed response of the stepping motor is not high, and it is difficult to achieve fast start and stop

[0005] Using the servo motor drive method, although closed-loop control can be realized and the response speed is also high, but the motion conversion process is required, so there is a backlash problem, and the system construction will be more complicated to achieve high-precision positioning control

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