ANTENNA DEVICE

• US 20120229344A1
• Filed: 05/18/2012
• Published: 09/13/2012
• Est. Priority Date: 11/19/2009
• Status: Active Grant

• Current Assignee: Fujikura Limited
• Original Assignee: Fujikura Limited
• Inventors: GUAN, Ning, TAYAMA, Hiroiku
• Granted Patent: US 9,478,849 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• 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 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

An antenna device (100) includes an antenna element (101) and an electric conductor plate (102) provided so as to face the antenna element (101). The antenna element (101) and the electric conductor plate (102) are short-circuited by a short-circuit section (104). The antenna element (101) is connected with both of external and internal electric conductors (122) and (123) constituting a feed line (121).

Claims

1. An antenna device, comprising:

an antenna element provided in a given plane; and

an electric conductor plate provided so as to face the given plane,

the antenna element and the electric conductor plate being short-circuited, and the antenna element being connected with a pair of electric conductors constituting a feed line.

2. The antenna device as set forth in claim 1, wherein

an orthogonal projection of the electric conductor plate with respect to the given plane includes the antenna element.

3. The antenna device as set forth in claim 1, wherein:

the antenna element has a path which continues from one end part of the antenna element to the other end part of the antenna element; and

the one and the other end parts of the antenna element are connected with the respective pair of electric conductors constituting the feed line.

4. The antenna device as set forth in claim 3, wherein:

the antenna element has a wind section made up of (a) a first root section including the one end part of the antenna element and (b) a second root section including the other end part of the antenna element; and

the first root section and the second root section (c) surround a feed section with which the pair of electric conductors constituting the feed line are connected and (d) are drawn out in respective opposite directions.

5. The antenna device as set forth in claim 4, wherein:

the first root section has (i) a first linear part that extends in a first direction from the one end part of the antenna element, (ii) a first bending part that extends, from an end part of the first linear part, in a second direction perpendicular to the first direction, (iii) a second linear part that extends, from an end part of the first bending part, in a direction opposite to the first direction, (iv) a second bending part that extends, from an end part of the second linear part, in a direction opposite to the second direction, and (v) a third linear part that extends, from an end part of the second bending part, in the first direction; and

the second root section has (vi) a fourth linear part that extends, from the other end part of the antenna element, in the direction opposite to the first direction, (vii) a third bending part that extends, from an end part of the fourth linear part, in the direction opposite to the second direction, (viii) a fifth linear part that extends, from an end part of the third bending part, in the first direction, (ix) a fourth bending part that extends, from an end part of the fifth linear part, in the second direction, and (x) a sixth linear part that extends, from an end part of the fourth bending part, in the direction opposite to the first direction.

6. The antenna device as set forth in claim 5, wherein

the antenna element has:

a first antenna section that continues to the first root section and has a meander shape whose return direction is perpendicular to the first direction; and

a second antenna section that continues to the second root section, extends in the first direction, and has a linear shape.

7. The antenna device as set forth in claim 4, wherein:

the first root section has (i) a first linear part that extends in a first direction from the one end part of the antenna element, (ii) a first bending part that extends, from an end part of the first linear part, in a direction perpendicular to the first direction, (iii) a second linear section that extends, from an end part of the first bending part, in a direction opposite to the first direction; and

the second root section has (iv) a third linear part that extends, from the other end of the antenna element, in the direction opposite to the first direction, (v) a second bending part that extends, from an end part of the third linear part, in a direction opposite to the second direction, and (vi) a fourth linear direction that extends in the first direction from an end part of the second bending part.

8. The antenna device as set forth in claim 7, wherein

the antenna element has:

a first antenna section that continues to the first root section and has a meander shape whose return direction is parallel to the first direction; and

a second antenna section that continues to the second root section and has a meander shape whose return direction is perpendicular to the first direction.

9. The antenna device as set forth in claim 7, wherein

the antenna element has:

a first antenna section that continues to the first root section and has a meander shape whose return direction is parallel to the first direction; and

a second antenna section that continues to the second root section and has a meander shape whose return direction is parallel to the first direction.

10. The antenna device as set forth in claim 9, wherein

the antenna element has a branch provided between the first antenna section and the second antenna section.

11. The antenna device as set forth in claim 9, wherein

spacing between the first antenna section and the second antenna section is greater than a length of the first linear section.

12. The antenna device as set forth in claim 4, wherein

the antenna element has a wider width section that is provided in a region where (i) at least one of the first and second root sections and (ii) the feed line overlap each other, and the antenna element has a line width of wider than the other part(s) of the at least one of the first and second root sections.

13. The antenna device as set forth in claim 3, wherein

the antenna element has a first branch whose leading end part is connected with the electric conductor plate.

14. The antenna device as set forth in claim 13, wherein

the antenna element has further a second branch adjacent to the first branch.

15. The antenna device as set forth in claim 13, wherein

the one and the other end parts of the antenna element form respective microstriplines.