Luneberg lens and antenna device using the same

Abstract

A luneberg lens, which is configured by combining a plurality of lens parts, has a problem on keeping of a combined condition of lens parts and securement of good moisture prevention, and displacement of lens parts not only becomes a cause of cost-up but also has a bad influence on an electric performance, and furthermore, intrusion of moisture and humidity deteriorates an electric performance, and therefore, these problems are solved by a simple and inexpensive method. A lens portion 2, which is configured by combining lens parts of spherical core and spherical shell-like resin foams, is configured by a luneberg lens which is sealed by a synthetic resin film 3 which is formed along a surface of that lens portion 2 and in which a thickness is 100 m or less and of which own relative dielectric constant is higher than a relative dielectric constant of the outermost layer of the above-mentioned lens portion.

Description

technical field [0001] The present invention relates to a Lunberg lens for transmitting or receiving radio waves to and from broadcasting and communication satellites, etc., and an antenna device using the same. Background technique [0002] As a sphere formed by a dielectric material as the basic form and according to the relative permittivity εr of each part of the lens, it roughly obeys the formula εr=2-(r / R) 2 , assuming that the radius of the sphere is R and the distance from the center of the sphere is r, the Lunberg lens, a radio wave lens designed in such a way, is known as a multi-correspondence radio wave lens through which it is possible to communicate with multiple other talking parties simultaneously. [0003] Meanwhile, this Lunberg lens, which is the prior art, shows some problems in the following patent documents 1 to 3 and so on, but these documents have no introduction about the handling and moisture-proofing of the lens. [0004] Patent Document 1: Unexam...

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Problems solved by technology

In addition, the thin cover layer is easy to deform due to loads such as wind pressure, and when sealing reflectors, etc., it is easy to weaken the sealing function.

[0014] In addition, in the case where it has been used for many years, the deterioration due to ultraviolet rays, etc. is strengthened, especially in the case of a thin cover layer, there are cases where cracks are generated in the cover layer, and when objects blown by a storm are knocked Cracks and damages while on it, and rainwater etc. flow into the lens part from the cracks and damages generated, significantly degrading the electrical performance of the lens, which also becomes a problem

For Lumber lenses made of resin foam beads fused together, when rainwater enters the gaps between the beads on the surface or the gaps in the middle layer, the water cannot be removed for a long time and remains, resulting in a significant decrease in electrical performance situation for a long time

[0015] Meanwhile, in the case where the manufactured Lunberg lens is transported to another factory where an antenna is constructed, it is conceivable that the lens absorbs moisture during transportation and storage, and there is a possibility that the electrical characteristics of the antenna are lowered

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