Fan-beam antenna

• US 7,075,496 B2
• Filed: 09/14/2004
• Issued: 07/11/2006
• Est. Priority Date: 09/22/2003
• Status: Expired due to Fees

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: Hidai, Takashi, Ono, Kazuyoshi
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Vy, Hung Tran
• Application Number:
  US10/939,341
• Publication Number:
  US 20050062664A1
• Time in Patent Office: 665 Days
• Field of Search: 343/771, 343/770, 343/772, 343/786, 343/911.R, 343/753, 343/781.R
• US Class Current: 343/786
• CPC Class Codes: H01Q 1/42 Housings not intimately mechanically associated with radiating elements, e.g. radome
• CPC Class Codes: H01Q 13/02 Waveguide horns
• CPC Class Codes: H01Q 19/08 for modifying the radiation pattern of a radiating horn in which it is located corrugated horns H01Q13/0208; producing a circular polarisation H01Q13/0241

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.

Claims

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.

3. A fan-beam antenna according to claim 1, wherein:

said convex-shaped dielectric plates have comb-shaped cross sections so that comb-tooth portions thereof are longer at a center portion in a vertical surface thereof and shorter at both end portions thereof.

2. 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; 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.