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Near-field measurement method for antenna array of virtual feed network

A technology of feeding network and antenna array, applied in the direction of antenna radiation pattern, etc., can solve the problems of huge experimental cost and huge radio frequency system, achieve high dynamic range and save measurement time

Inactive Publication Date: 2013-10-23
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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AI Technical Summary

Problems solved by technology

As the number of elements in the antenna array increases, the RF system will become large and the cost of experimentation will be very large

Method used

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  • Near-field measurement method for antenna array of virtual feed network
  • Near-field measurement method for antenna array of virtual feed network
  • Near-field measurement method for antenna array of virtual feed network

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Embodiment Construction

[0020] Taking planar near-field measurement as an example, both spherical near-field and cylindrical near-field can be carried out by referring to this scheme. The concrete implementation method of the present invention is:

[0021] 1. The size of the antenna array with the number of known units N is L, the number of measurement frequency points Fn within the operating frequency range is taken, and the plane near-field measurement distance D is 3 to 10 times the maximum wavelength of the antenna’s operating frequency range. Considering the plane The error caused by the limited scanning surface of the near-field measurement, if the maximum credible far-field angle is ±θ, then the sampling range of the plane near-field measurement is the minimum (See figure 1 ).

[0022] 2. In the sampling range not less than L, the number of sampling points is evenly set to K according to the sampling interval not greater than 1 / 2 of the minimum wavelength of the antenna operating frequency ...

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Abstract

The invention belongs to a near-field measurement method for an antenna array of a virtual feed network. The method includes the steps of firstly, setting a near-field measurement area which accords with antenna array beam scanning ranges and meets sampling theorems, secondly, obtaining near area electromagnetic field vector data of each antenna radiating element sequentially on the same sampling position, and connecting other units not to be measured with matched load, thirdly, after measurement on all units is completed, carrying out vector superposition on measured data of all antenna radiating elements sequentially on the same sampling position according to arbitrary weighting laws, virtualizing a feed network so as to obtain near area electromagnetic field data of the antenna array under the virtual feed network, and lastly, computing electrical characteristics of a far-field area through strict near-field and far-field mathematical manipulation to analyze and estimate performance indexes of the antenna array.

Description

technical field [0001] The invention relates to the technical field of antenna near-field measurement and phased array beamforming. On the basis of near-field measurement, a virtual feeding network method is used to analyze and evaluate the performance indexes of the antenna array under various functions. Background technique [0002] The invention is used for the near-field measurement of the antenna array of the virtual feed network. [0003] The antenna array is the most commonly used antenna type for phased array radar. The performance of the antenna array is determined by the performance of the antenna radiating unit itself, the matching characteristics between the units and the performance of the feeding network, and the antenna radiating unit and the feeding network are often Design is carried out separately in the development process. The performance of the feed network can be directly measured by a network analyzer, and the performance of the antenna unit itself an...

Claims

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Application Information

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IPC IPC(8): G01R29/10
Inventor 朱平常德杰简玲袁洪石磊
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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