A method of manufacturing a hemispherical Lunberg lens antenna

Abstract

The invention discloses a manufacturing method of a hemispherical Lunberian lens antenna. The hemispherical Lunberian lens antenna is distributed with cavities, has a hemispherical surface and a bottom plane, and the bottom plane is a plane passing through the center of the sphere; it is characterized in that the Described method comprises the steps: (1) select the material that is used to manufacture hemispherical Lunberg lens antenna; (2) determine the structural parameter of hemispherical Lunberg lens antenna; (3) make the hemispherical Lunberg lens antenna with described structural parameter A three-dimensional digital model; and (4) manufacturing the hemispherical Lunberg lens antenna according to the three-dimensional digital model by using an additive manufacturing method; and (5) pasting a metal foil layer on the bottom plane. The shape, size and distribution of the cavity structure in the hemispherical Lunberg lens antenna produced by the present invention are adjustable and controllable, which realizes the precise control of the average dielectric constant of the concentric layer and can meet different design requirements; and the production materials are widely used , The production process is simple, the yield is high, and there is no gap between layers, which makes the product quality more stable and reliable.

Description

technical field [0001] The invention relates to the communication field, and more specifically, relates to a hemispherical Lunberg lens antenna. Background technique [0002] The basic shape of the Lunberg lens antenna is a sphere (sometimes referred to as a Lunberg sphere in this paper), which is a concept proposed by R.K. Lunberg in 1944 based on the geometrical optics method. A Luneberg lens antenna is a lens antenna that focuses electromagnetic waves to a focal point through a dielectric. It is a sphere made of dielectric material that can focus electromagnetic waves coming from all directions to a corresponding point on the surface of the lens. In the part infinitely close to the surface of the sphere, the dielectric constant of the material=1 (that is, the same as the dielectric constant of air), and the dielectric constant=2 at the center of the sphere. The dielectric constant of the material from the surface to the center of the sphere changes gradually, and its va...

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Problems solved by technology

However, when the foam density reaches the expected value during foaming, it only means that the macroscopic average dielectric constant of the whole foam reaches the expected value. Due to the characteristics of the foaming process, it is difficult to ensure that the material is uniform at the micro level. There are a large number of bubbles that are too large or too small, so that the dielectric constant fluctuates microscopically, causing product performance to deviate from expectations, and the degree of performance deviation of different batches of products is also different. In addition, according to the scattering effect, when the foam When the diameter of the inner bubble is greater than one-third of the incident wavelength, it will also cause a significant decrease in the performance of the Lunberg lens

At the same time, the foaming method may cause secondary foaming of the beads during the molding process, making it difficult to control the dielectric constant and reduce the uniformity

In addition, the foam material shrinks after the mold cools, resulting in an air gap between adjacent spherical shells during assembly, which has a greater impact on the performance of the lens

Therefore, the foaming method has problems that are difficult to control the tolerance of the dielectric constant and the interior is not easy to be uniform.

[0013] As a dielectric passive device, Lunberg lens antenna has the advantages of small size, light weight, large radar cross-sectional area, large pattern and wide spectrum width, but its manufacturing process is difficult, tedious, time-consuming, costly, and consistent. Poor performance, which limits its promotion and application

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