Fan-beam antenna
First Claim
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1. A fan-beam antenna comprising at least:
- a flare which is long in a horizontal direction thereof and whose cross section is horn-shaped;
a water-proof box housing components of said antenna; and
a radome radiation surface which is located in front of said flare and constituted of a part of said water-proof box;
wherein said radome radiation surface is constituted of a plurality of dielectric plates equivalently;
wherein at least one of said dielectric plates is a dielectric lens having a characteristic similar to a convex lens;
wherein said radome radiation surface is constituted of three dielectric plates;
wherein one of said dielectric plates which is located most outside thereof is a radome whose thickness is approximately uniform; and
wherein two of said dielectric plates which are located inside thereof are convex-shaped.
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Abstract
An object of the invention is to provide a fan-beam antenna which comprises a flare which is long in a horizontal direction thereof and whose cross section is horn-shaped, and a water-proof box housing components of said antenna, in which a vertical beam width is made narrow without spreading a vertical size to increase gain. Accordingly, this invention is characterized in that a radome radiation surface is constituted of a plurality of dielectric plates equivalently, and at least one of the dielectric plates is made a dielectric lens having a characteristic similar to a convex lens.
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Citations
3 Claims
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1. A fan-beam antenna comprising at least:
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a flare which is long in a horizontal direction thereof and whose cross section is horn-shaped; a water-proof box housing components of said antenna; and a radome radiation surface which is located in front of said flare and constituted of a part of said water-proof box; wherein said radome radiation surface is constituted of a plurality of dielectric plates equivalently; wherein at least one of said dielectric plates is a dielectric lens having a characteristic similar to a convex lens; wherein said radome radiation surface is constituted of three dielectric plates; wherein one of said dielectric plates which is located most outside thereof is a radome whose thickness is approximately uniform; and wherein two of said dielectric plates which are located inside thereof are convex-shaped. - View Dependent Claims (3)
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2. A fan-beam antenna comprising at least:
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a flare which is long in a horizontal direction thereof and whose cross section is horn-shaped; a water-proof box housing components of said antenna; and a radome radiation surface which is located in front of said flare and constituted of a part of said water-proof box; wherein said radome radiation surface is constituted of a plurality of dielectric plates equivalently; wherein at least one of said dielectric plates is a dielectric lens having a characteristic similar to a convex lens; and wherein said convex-shaped dielectric plate has a comb-shaped cross section so that comb-tooth portions thereof are longer at a center portion in a vertical surface thereof and shorter at both end portions thereof.
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Specification