Antenna cover electric property forecasting method based on distant field
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A performance prediction, radome technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of large amount of calculation, inaccurate calculation results, and no consideration of radome block bolts, etc., to reduce the amount of calculation. , high precision effect
Inactive Publication Date: 2012-07-18
XIDIAN UNIV
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The disadvantage of this method is: for the electric large-scale covered antenna, due to the large amount of calculation, it is often impossible to obtain the result within the required time in practical applications, and som
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Embodiment 1
[0069] refer to figure 1 , the implementation steps of the present invention are as follows:
[0070] Step 1, establish the geometric model of the parabolic antenna.
[0071] Obtain the antenna aperture D and focal length f, and build a paraboloid in commercial electromagnetic analysis software. The apex of the paraboloid is taken at the origin of the coordinate system, and the antenna aperture plane is perpendicular to the z-axis. After the modeling is completed, obtain the antenna operating frequency freq and the speed of light c. formula Calculate the wavelength λ, and then mesh the paraboloid, and set the grid side length to
[0072] Step 2, establish the geometric model of the feed source as the excitation of the antenna.
[0073] In this example, adding excitation to the antenna is realized by establishing the geometric model of the feed source. The establishment of the feed source is to first construct a line segment with a length of 1 / 2 wavelength, the midpoint a...
Embodiment 2
[0115] Step 1, establish the geometric model of the parabolic antenna
[0116] Obtain the antenna aperture D and focal length f, and build a paraboloid in commercial electromagnetic analysis software. The apex of the paraboloid is taken at the origin of the coordinate system, and the antenna aperture plane is perpendicular to the z-axis. After the modeling is completed, obtain the antenna operating frequency freq and the speed of light c. formula Calculate the wavelength λ, and then mesh the paraboloid, and set the grid side length to
[0117] Step 2, add the far field value of the feed source as the excitation
[0118] Save the known far-field value of the feed source as a ".dat" file and import it into the focal point of the parabola. The file format has six columns of data, separated by spaces, and each column of data represents the vertical circumferential angle, Angle in the horizontal circumferential direction, electric field amplitude in the vertical circumferentia...
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Abstract
The invention discloses an antenna cover electric property forecasting method based on a distant field. The problems in the prior art of large calculation amount and inaccurate modeling can be mainly solved. According to the technical scheme, the antenna cover electric property forecasting method comprises the following steps of: establishing an antenna model and a feed source model in electromagnetic analysis software or giving a feed source distant field in a file manner; solving an antenna two-dimensional distant field value under feed source excitation, drawing a directional diagram and extracting electric property indexes; establishing a bolt model and solving a three-dimensional distant field under bolt influence; establishing an antenna cover model, solving a two-dimensional distant field value under three-dimensional distant field excitation, drawing a directional diagram and extracting electric property indexes; comparing the two-dimensional direction diagrams before and after additionally arranging the antenna cover; if a result meets requirements, outputting the two-dimensional direction diagrams before and after additionally arranging the antenna cover, an electric property variation value and structural parameters; and otherwise, modifying the antenna cover model and repeating an analysis process until the result meets the requirements. According to the antenna cover electric property forecasting method provided by the invention, the calculation amount is reasonably controlled, and the electric property of the large-size electric antenna cover is forecasted more accurately.
Description
technical field [0001] The invention belongs to the technical field of radar antennas, and in particular relates to a far-field-based method for predicting the electrical performance of a radome, which is used to predict the electrical performance of an electrically large-sized covered antenna system whose product of the working frequency GHz and the antenna aperture m is greater than 100. technical background [0002] A radome is an enclosure that protects an antenna from the elements, a covering made of natural or man-made dielectric material, or a specially shaped electromagnetic window formed by a truss-supported dielectric shell. A well-designed radome, in addition to functions such as protection, conductivity, reliability, concealment and decoration, can also prolong the service life of each part of the entire system, reduce life costs and operating costs, and simplify Design, reduce maintenance costs, ensure the accuracy of the antenna surface and position, and create...
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