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An equivalent radiation modeling method based on spherical near-field measurement and spherical mode source

A mode and near-field technology, applied in the field of effective radiation modeling, can solve problems such as inability to improve accuracy in a short period of time, low model accuracy, and lack of flexibility, achieving short modeling time, high model accuracy, and reduced calculations the effect of time

Active Publication Date: 2018-12-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In the existing modeling method, the model is composed of multiple ideal dipoles, such as the literature "M. Serhir, P. Besnier, M. Drissim," Anaccurate equi valent behavioral model of antenna radiation using a mode-matching technique based on sph erical near field measurements, "IEEETrans.Antennas Propag., vol.56, no.1, pp.48-57, J an.2008", where the position and excitation of each ideal dipole is determined, etc. However, the position of the ideal dipole is determined according to the empirical formula, and its spatial distribution is unchanged for different antennas to be tested, which lacks flexibility and the accuracy of the model is low; and due to the inherent defects of this method , optimizing the spatial distribution of ideal dipoles will consume a lot of time and cannot improve the accuracy in a short time

Method used

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  • An equivalent radiation modeling method based on spherical near-field measurement and spherical mode source
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  • An equivalent radiation modeling method based on spherical near-field measurement and spherical mode source

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Embodiment 1

[0091] This embodiment takes the binary patch antenna array working at 3GHz as an example to model; the relative dielectric constant of the antenna dielectric substrate is 2.2, and the thickness of the dielectric substrate is 2.87mm; the antenna size is L1=80mm, L2=46.648mm , W1=100mm, W2=31.1807mm, d1=16.1mm, d2=40mm, d3=9.4096mm, d4=16.676mm; Feed phase difference is ninety degrees; Equivalent model is established by the present invention by 12 spherical patterns source composition, which can be equivalently transformed into 72 ideal dipoles, such as image 3 Shown is the radiation field comparison diagram of the antenna array and its equivalent model, the root mean square error is 6.01%, and the computer modeling time (excluding spherical near-field test time) is 303 seconds; Figure 4 Shown is the radiation field comparison diagram of the original antenna, the traditional model, and the model of the present invention; the root mean square error of the traditional model is ...

Embodiment 2

[0093] In this embodiment, a half-wave antenna placed next to the metal block is used as an example to model, and its operating frequency is 5GHz; this embodiment aims at simulating the antenna radiation characteristics affected by the environment; the equivalent model is established by the present invention by 12 The ball mode source is composed of 72 ideal dipoles, such as Image 6 Shown is the comparison diagram of the radiator and its equivalent model radiation field, the root mean square error is 5.04%, and the computer modeling time (excluding spherical near-field test time) is 263 seconds; Figure 4 Shown is the comparison diagram of the radiation field of the original antenna, the traditional model, and the model of the present invention; the root mean square error of the traditional model is 13.52%; it can be seen that the accuracy of the model of the present invention is greatly improved, and the modeling time is short.

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Abstract

The invention belongs to the technical field of antenna measurement, and provides an equivalent radiation modeling method based on spherical near-field measurement and a spherical mode source, which is used for overcoming the problems of invariant spatial distribution of ideal dipole, lack of flexibility, low model precision and the like in a conventional modeling method. The near-field measurement data of an antenna sphere to be tested is taken as a basis, the spherical mode source is taken as the basic unit of the equivalent model, spherical wave expansion and pattern matching are utilized,an equivalent model is established to make the model possess the radiation characteristics similar to the antenna to be measured, and the azimuth and elevation angles of the spherical mode source areseparated from each other, and the azimuth angles are optimized only for the spherical mode source. The precision of the model can be improved in a short time by this one-dimensional optimization method, which is of practical value in engineering.

Description

technical field [0001] The invention belongs to the technical field of antenna measurement, and specifically provides an equivalent radiation modeling method based on spherical near-field measurement and a spherical mode source. Background technique [0002] In the field of antenna testing, two methods, near-field testing and far-field testing, are mainly used. Far-field testing requires a pure space electromagnetic environment and a test distance for the far-field conditions of the antenna to be tested. There are many difficulties in the implementation process. The near-field measurement is within the near area of ​​the antenna, and is not affected by the distance effect and the external environment in the far-field test. It has the advantages of high test accuracy, strong confidentiality, and all-weather work; Transformation, antenna diagnosis, electromagnetic interference prediction and calculation of near-field shielding effectiveness are of great significance. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 李睿明胡皓全包永芳刘开琦林志鹏杨伟雷世文唐璞何子远陈波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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