Manufacture method of hemispherical luneberg lens antenna

Abstract

The invention discloses a manufacture method of a hemispherical luneberg lens antenna. Hollow cavities are distributed in the hemispherical luneberg lens antenna; the hemispherical luneberg lens antenna is provided with a hemispherical surface and a bottom plane, and the bottom plane passes by a sphere center. The manufacture method is characterized by comprising steps as follows: (1), a material used for manufacturing the hemispherical luneberg lens antenna is selected; (2), structure parameters of the hemispherical luneberg lens antenna are determined; (3), a hemispherical luneberg lens antenna three-dimensional digital model with the structure parameters is manufactured; (4), the hemispherical luneberg lens antenna is manufactured according to the three-dimensional digital model with a material increase manufacturing method; (5), a metal foil layer is attached to the bottom plane. The shape, the size and distribution of hollow cavity structures in the manufactured hemispherical luneberg lens antenna are adjustable and controllable, the average dielectric constant of concentric layers is accurately controlled, and different design requirements can be met; the manufacturing materials are wide, the production process is simple, the rate of finished products is high, interlayer gaps are avoided, and the product quality is 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 f

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