Plane antenna

Abstract

A plane antenna comprises a substrate having a first surface and a second surface, a first radiating element, a first power feeding pattern connected to the radiating element, and a first non-power feeding loop type radiating element provided adjacent to the first radiating element, all disposed on the first surface of the substrate, and a second radiating element, a second power feeding pattern connected to the radiating element, and a second non-power feeding loop type radiating element provided adjacent to the second radiating element, all disposed on the second surface of the substrate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic plan view illustrating an example of the plane antenna of the related art.

FIG. 2 is a structural diagram of a plane antenna of the present invention.

FIG. 3 is a detail structural diagram (a) of the plane antenna of the present invention viewed from the front surface and detail structural diagram (b) of the plane antenna of the present invention viewed from the rear surface.

FIG. 4 is a diagram illustrating the Smith chart of the plane antenna of the present invention.

FIG. 5 is a diagram illustrating the Smith chart of the plane antenna when the length of stub is adjusted.

FIG. 6-A is a diagram illustrating the Smith chart of the plane antenna when line width of an impedance-converting unit 4 of FIG. 3 is adjusted to 4 mm.

FIG. 6-B is a diagram illustrating the Smith chart of the plane antenna when line width of the impedance-converting unit 4 of FIG. 3 is adjusted to 5 mm.

FIG. 6-C is a diagram illustrating the Smith chart of the plane antenna when line width of the impedance-converting unit 4 of FIG. 3 is adjusted to 6 mm.

FIG. 7 is a diagram illustrating a structure of plane antenna product for circularly polarized wave of the present invention.

FIG. 8-A is a diagram illustrating antenna gain characteristic of the plane antenna product for circularly polarized wave of FIG. 7.

FIG. 8-B is a diagram illustrating VSWR (Voltage to Standing Wave Ratio) characteristic of the antenna as the parameter to know the impedance matching state of the antenna product for circularly polarized wave of FIG. 7.

FIG. 8-C is a diagram illustrating the axial radio characteristic of the circularly polarized wave from the antenna as the plane antenna product for circularly polarized wave of FIG. 7.

FIG. 9 is a diagram illustrating a structure of the plane antenna for adjustment of axial ratio of the present invention.

Claims

1. A plane antenna comprising: a substrate having a first surface and a second surface;a first radiating element, a first power feeding pattern connected to the radiating element, and a first non-power feeding loop type radiating element provided adjacent to the first radiating element, all disposed on the first surface of the substrate; anda second radiating element, a second power feeding pattern connected to the radiating element, and a second non-power feeding loop type radiating element provided adjacent to the second radiating element, all disposed on the second surface of the substrate.

2. The plane antenna according to claim 1, wherein the first and second radiating elements form a dipole antenna.

3. The plane antenna according to claim 1, further comprising an impedance adjusting unit provided to a part of at least one of the first and second radiating elements.

4. The plane antenna according to claim 1, further comprising an impedance converting unit formed by changing a part of a pattern width of at least one of the first or second power feeding patterns of the plane antenna.

5. The plane antenna according to claim 1, wherein at least one of the first and second power feeding patterns of the plane antenna is formed in a shape of a triangle with the power feeding side defined as the bottom side of the triangle and the power feeding point of the radiating element defined as the vertex of the triangle.

6. The plane antenna according to claim 1, wherein at least one of the first and second power feeding patterns of the plane antenna is formed in a shape of an isosceles triangle with the power feeding side defined as the bottom side of the triangle and the power feeding point of the radiating element defined as the as the vertex of the triangle.

7. The plane antenna according to claim 1, wherein at least one of the first and second non-power feeding loop type radiating elements is further provided with an adjusting unit for adjusting an interval with an adjacent radiating element.

8. The plane antenna according to claim 1, further comprising an unbalanced-to-balanced converting unit.

9. The plane antenna according to claim 7, wherein the unbalanced-to-balanced converting unit is a part of the first power feeding pattern and comprises an impedance adjusting unit.

10. The plane antenna according to claim 8, wherein the second power feeding pattern is provided with an impedance converting unit formed by changing a part of a pattern width of the second power feeding pattern.