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Near-field testing method for reconstructing antenna array far-field directional diagram in radiating near-field region

A test method and antenna array technology, applied in directions such as antenna radiation patterns, can solve the problems of difficult phase calibration in near-field testing, unsuitable for massive MIMO antenna array measurement, etc., and achieve the effect of shortening test distance and reducing complexity

Active Publication Date: 2018-09-28
TSINGHUA UNIV
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Problems solved by technology

However, in the massive MIMO antenna array test, the phase calibration of the near-field test is relatively difficult, so the traditional near-field test scheme based on the near-field-far-field conversion technology is not suitable for the measurement of the massive MIMO antenna array.

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  • Near-field testing method for reconstructing antenna array far-field directional diagram in radiating near-field region
  • Near-field testing method for reconstructing antenna array far-field directional diagram in radiating near-field region
  • Near-field testing method for reconstructing antenna array far-field directional diagram in radiating near-field region

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Embodiment Construction

[0014] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0015] A near-field testing technique for reconstructing the far-field pattern of an antenna array in the radiating near-field region. According to the design schematic, a specific embodiment of a 20-element one-dimensional line antenna array measurement and a pointing θ=60° are given, The specific embodiment that has the two-dimensional surface antenna array measurement of 20 * 20 units of direction, is described below in conjunction with accompanying drawing:

[0016] refer to figure 2 (a), a 20-unit one-dimensional line antenna array is included in this embodiment, and the maximum radiation direction is in the side-firing direction The spacing between the antenna elements is λ / 2, and the far-field test distance is 200λ. Figure 2(b) shows the compensation phase distribution on each antenna element required by this scheme. This phase dis...

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Abstract

The invention discloses a near-field testing method for reconstructing an antenna array far-field directional diagram in a radiating near-field region, and belongs to the technical field of antenna measurement. The method comprises the steps: carrying out the phase correction of all antenna units in a to-be-detected antenna array; and reconstructing the antenna array far-field directional diagramin the radiating near-field region under a given distance, wherein the phase correction indicates that the beam pointing direction (shown in the description) of the antenna array far-field directionaldiagram and a near-field testing distance R jointly determine the phase distribution of all antenna units. According to the invention, a far-field directional diagram of a large-scale MIMO antenna array is directly reconstructed at a position with the testing distance R in the radiating near-field region, and the method does not need the near-field to far-field conversion. Afterwards, the methodcan achieve the direct measurement of the far-field directional diagram at the near-field testing distance R. Therefore, the method shortens the testing distance of the large-scale MIMO antenna array,and also reduces the complexity of a near-field measurement system.

Description

technical field [0001] The invention belongs to the technical field of antenna measurement, relates to antenna array near-field measurement, in particular to a near-field test method for reconstructing the antenna array far-field pattern in the radiation near-field area. Background technique [0002] In the case of increasingly tight wireless spectrum resources, massive MIMO (Massive MIMO) will be the core technology in 5G mobile communications in order to increase the spectral efficiency of wireless mobile communications by another order of magnitude. In a massive MIMO system, a base station will be equipped with a large number of antennas, usually hundreds or even thousands of antennas, which is 1 to 2 orders of magnitude more than the number of antennas in existing MIMO systems. However, with the sharp increase in the number of antennas, the size of the radiation aperture of the antenna array also increases. In the radiation field area of ​​the antenna, the radiation are...

Claims

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Application Information

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IPC IPC(8): G01R29/10
CPCG01R29/10
Inventor 刘培钦张志军李越
Owner TSINGHUA UNIV
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