Circularly polarized wave antenna suitable for miniaturization

• US 20030058170A1
• Filed: 09/17/2002
• Published: 03/27/2003
• Est. Priority Date: 09/21/2001
• Status: Active Grant

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Iijima, Kouta
• Granted Patent: US 6,727,858 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/26 Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre

Abstract

A circularly polarized wave antenna is constructed such that the circularly polarized wave antenna has four flat plate-shaped dielectrics having the substantially same thickness vertically provided on a printed substrate and arranged in a square-cylinder shape as a whole, and four radiation conductors provided, on each outer wall surface of the flat plate-shaped dielectrics, inclined in a fixed direction, such that a lower end of each of the radiation conductors is electrically connected to the printed substrate and such that electric power is fed to the four radiation conductors in phase. Thereby, a mechanical orthogonal relationship of each radiation conductor is retained so that deterioration in the antenna characteristics and the poor connection resulting from external vibrations can be reduced, and also a required length of the radiation conductor can be shortened by a shortened wavelength due to the flat plate-shaped dielectric having high specific inductive capacity. Also, since the flat plate-shaped dielectric is not likely to unevenly contract in a calcination process during manufacture, it is also easy to perform fine adjustment of the plate thickness and the like by polishing after the calcination, and it becomes easy to prevent variations in the antenna characteristics resulting from dimensional error or the like.

Claims

1. A circularly polarized wave antenna, having four flat plate-shaped dielectrics having the substantially same thickness vertically provided on a printed substrate and arranged in a square-cylinder shape as a whole, and four radiation conductors provided on each outer wall surface of the flat plate-shaped dielectrics inclined in a fixed direction, wherein the structure is arranged such that a lower end of each of the radiation conductors is electrically connected to the printed substrate and such that electric power is fed to the four radiation conductors in phase.

2. The circularly polarized wave antenna according to claim 1, wherein its structure is arranged such that of a pair of the flat plate-shaped dielectrics adjacent substantially at right angles, a protrusion for protruding from a side of one flat plate-shaped dielectric by a portion corresponding to the plate thickness is fitted into a recess obtained by cutting only a portion corresponding to a plate thickness in a side of the other flat plate-shaped dielectric.

3. The circularly polarized wave antenna according to claim 1, wherein four of the flat plate-shaped dielectrics are all of the same shape.

4. The circularly polarized wave antenna according to claim 2, wherein four of the flat plate-shaped dielectrics are all of the same shape.

5. The circularly polarized wave antenna according to claim 3, wherein an upper half of one side and a lower half of another side of the flat plate-shaped dielectric are cut by a portion corresponding to the plate thickness along a direction of a width.

6. The circularly polarized wave antenna according to claim 4, wherein an upper half of one side and a lower half of another side of the flat plate-shaped dielectric are cut by a portion corresponding to the plate thickness along a direction of a width.