| 摘要 |
PROBLEM TO BE SOLVED: To provide a dielectric lens which can be molded in an optional shape with a fixed relative dielectric constant kept between its surface and interior and also with high dimensional accuracy, can cope with the zoning of a complicated shape, and can obtain the excellent antenna characteristic by laminating together plural disk-shaped dielectric sheets. SOLUTION: The dielectric original cloth made of such materials as polypropylene, a composite dielectric, etc., is prepared with its thickness (t) smaller thanλ/4 working frequency. Then plural disk-shaped dielectric sheets 1a to 1j of different diameters are molded from the dielectric original cloth by a press, etc. These dielectric sheets are laminated together on the same center axis an in order of diameters and formed into a hemispherical dielectric lens 10. Thus the dielectric sheets which are molded by a press are laminated together in order of diameters and formed into a thick dielectric lens. Therefore, the so-called shrinkage is not caused and the high dimensional accuracy is secured. Then an even relative dielectric constant is kept between the inside and outside of the dielectric lens, and the excellent antenna characteristic is obtained.
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