High-efficiency dielectric lens antenna based on novel open-celled structure

Abstract

The invention discloses a dielectric lens antenna applied to wireless satellite communication in a luneberg lens antenna system. The basic structure of the dielectric lens antenna comprises a metallic reflecting plate part, a feed-source bracket part, a dielectric lens part and a feed-source part. The metallic reflecting plate part mainly performs shielding and reflecting actions. The dielectric lens part is formed by drilling a cylindrical hole in polytetrafluoroethylene and fixed on the metallic reflecting plate. The feed-source bracket is fixed between the metallic reflecting plate and the dielectric lens, the feed source is fixed on the feed-source bracket, and the incident and emergent foci and the beam angle of the feed source are determined through the slide and the extension of the feed source on the feed-source bracket. Based on the basic structure of the invention, the position, the size and the shape of an air hole are reasonably changed so as to form other concrete embodiments of the invention.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, and relates to a dielectric lens antenna, in particular to a dielectric lens with a required dielectric constant used in a Lunberg lens antenna system for satellite communications. Background technique [0002] Today, with the rapid development of satellite wireless communication, as the main carrier of signal transmission and reception, antenna plays a decisive role in the network construction of wireless communication system. Domestically, the development of live broadcast satellites is paid more and more attention to, and the demand for one-line multi-satellite receiving technology is increasing day by day. Based on this premise and combined with some research work of its own, the present invention designs an efficient one-line multi-satellite receiving antenna. [0003] Traditional satellite receiving antennas are parabolic antennas and Cassegrain antennas, which have the advantag...

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Problems solved by technology

However, this technical requirement is very strict on the control of foaming agent, expansion temperature and selection of raw materials, and it also has very strict requirements on the chemical and physical characteristics of the material. Production is relatively difficult

Generally speaking, the baking time and temperature control of the Lumber lens antenna based on the foaming process are different for the processing of lens spherical shells with different dielectric constants, sizes, and thicknesses. It is difficult to find a more general foaming rule, so that It is more difficult and costly to obtain actual engineering mass production

[0006] There are many ways to realize the Lunberg lens antenna through the aperture structure. Compared with other aperture structures, D.M.Harrison et al. published a paper titled "A Hemispherical lens antenna for multi-satellite reception" on Antennas and Propagation Society International Symposium, 1992. In ", multiple layers of polystyrene material with hemispherical holes are used, and then each layer of hemispherical holes is aligned and pasted to form a complete spherical hole, and then multiple sheets of polystyrene with multiple complete spherical holes are used to make a hemisphere Body, thus made a dielectric lens antenna with an equivalent dielectric constant of 1.52, its gain performance is better under the measurement of a specific focal length, but due to the multi-layer hemispherical hole, the spherical hole is difficult to process in practice, and the size is relatively small Small lenses can still be made barely, and the complexity and cost will undoubtedly be greatly increased in the manufacture of larger electrical size lenses. This technology is also not conducive to practical application and mass production.

In 2003, Sebastien Rondineau et al. published in IEEE Antennas Wieless Propagat.Lett., vol.2, pp.163-166, 2003. The layering proposed by "A Sliced ​​Spherical Luneburg Lens" and the size of the holes in each layer are different To realize Lunberg lens antenna, but the antenna efficiency is very low, only 30% at 26.5GHz, and it is difficult to process, and it is also a problem for the combination of each layer. For practical applications, its physical firmness also needs to be studied

However, the post holes processed by this technology are complex, and the sizes of the post holes are not the same, so many processing components are required, and the combination and fixation of the entire spherical lens antenna is relatively difficult, the physical firmness is very low, and the cost is extremely high. It is difficult to achieve mass production and high-performance lens antennas

KenichiSato et al. published in Electronics and Communications in Japan, Part 1, Vol.85, No.9, 2002 entitled "A Plate Luneberg Lens with the Permittivity Distribution Controlled by Hole Density" utilizes a columnar opening on a dielectric material and a dielectric The planar Lunberg lens antenna was made by controlling the dielectric constant change on the two-dimensional plane, such as the thickness change, and successfully combined with the planar slotted antenna to develop a new planar antenna, and the two-dimensional gain performance has good effects. However, the biggest disadvantage of this kind of antenna is that it cannot realize three-dimensional scanning and is not suitable for satellite communication

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