ANTENNA DEVICE AND GROUND CONNECTION STRUCTURE

• US 20180269571A1
• Filed: 03/07/2018
• Published: 09/20/2018
• Est. Priority Date: 03/15/2017
• Status: Abandoned Application

• Current Assignee: Denso Wave Inc (DENSO Corporation)
• Original Assignee: Denso Wave Inc (DENSO Corporation)
• Inventors: HIRAIWA, Yosuke
• Application Number:
  US15/915,004
• Publication Number:
  US 20180269571A1
• Time in Patent Office: Days
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 9/0414 in a stacked or folded configuration
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An antenna device includes first and second folded antenna elements connected to first and second perpendicular sides of a ground at first and second connection points, respectively. The first and second sides have lengths Gx and Gy shorter than or equal to half the signal wavelength λ. Gx1 is defined as a length of a portion of the first side between the first connection point and an end of the first side away from the first folded antenna element in a direction opposite to a folding direction thereof. Gy1 is defined as a length of a portion of the second side between the second connection point and an end of the second side away from the second folded antenna element in a direction opposite to a folding direction thereof. The Gx1 and Gy1 satisfy inequalities: 0≤Gx1<Gx/2 and 0≤Gy1<Gy/2.

Claims

1. An antenna device comprising:

a ground having a first side which has a length Gx, and a second side which has a length Gy and is perpendicular to the first side, each of the lengths Gx and Gy being smaller than or equal to λ

/2 when a signal wavelength is defined as λ

, and

a first folded antenna element connected to the first side of the ground at a first connection point and having a first folded element portion folded in a first folding direction,

a second folded antenna element connected to the second side of the ground at a second connection point and having a second folded element portion folded in a second folding direction, wherein

Gx1 is defined as a length of a portion of the first side between the first connection point and an end of the first side away from the first folded element portion in a direction opposite to the first folding direction, and the length Gx1 satisfies inequalities;

0≤

Gx1<

Gx/2, and

Gy1 is defined as a length of a portion of the second side between the second connection point and an end of the second side away from the second folded element portion in a direction opposite to the second folding direction, and the length Gy1 satisfies inequalities;

0≤

Gy1<

Gy/2.

2. The antenna device according to claim 1, wherein the lengths Gx1 and Gy1 satisfy inequalities:

0≤

Gx1<

Gx/4 and 0≤

Gy1<

Gy/4.

3. The antenna device according to claim 2, wherein the lengths Gx1 and Gy1 satisfy equalities:

Gx1=Gy1=0.

4. The antenna device according to claim 1, wherein the ground has a square shape.

12. The antenna device according to claim 1, wherein a number of first folded antenna elements connected to the first side of the antenna ground is one.

13. The antenna device according to claim 12, wherein a number of second folded antenna elements connected to the second side of the antenna ground is one.

14. The antenna device according to claim 1, wherein the end of the first side and the end of the second side are located at the same corner of the ground.

15. The antenna device according to claim 1, wherein the end of the first side and the end of the second side are located at corners of the ground adjacent to each other.

16. The antenna device according to claim 1, wherein the end of the first side and the end of the second side are located at corners of the ground opposite from each other.

17. The antenna device according to claim 1, wherein the first folded antenna element has a length of λ

/4, and the second folded antenna element has a length of λ

/4.

18. The antenna device according to claim 1, wherein the first folded element portion is folded to extend parallel to the first side of the antenna ground.

19. The antenna device according to claim 18, wherein the second folded element portion is folded to extend parallel to the second side of the antenna ground.

5. A ground connection structure comprising:

an antenna device including;

an antenna ground having a first side which has a length Gx, and a second side which has a length Gy and is perpendicular to the first side, each of the lengths Gx and Gy being smaller than or equal to λ

/2 when a signal wavelength is defined as λ

, and

a first folded antenna element connected to the first side of the antenna ground at a first connection point and having a first folded element portion folded in a first folding direction,

a second folded antenna element connected to the second side of the antenna ground at a second connection point and having a second folded element portion folded in a second folding direction,

a circuit ground, and

a connector connecting the antenna ground and the circuit ground, wherein

Gx1 is defined as a length of a portion of the first side between the first connection point and an end of the first side away from the first folded element portion in a direction opposite to the first folding direction, and the length Gx1 satisfies inequalities;

0≤

Gx1<

Gx/2,

Gy1 is defined as a length of a portion of the second side between the second connection point and an end of the second side away from the second folded element portion in a direction opposite to the second folding direction, and the length Gy1 satisfies inequalities;

0≤

Gy1<

Gy/2,

the circuit ground has a rectangular shape having a short side and a long side, and the short side and one of the first and second sides are aligned while the long side faces the antenna ground, and

the connector extends from a side of the circuit ground opposite from the short side, extends parallel to a third side of the antenna ground opposite from the one of the first and second sides, and is connected to a center part of the third side of the antenna ground.

6. The ground connection structure according to claim 5, wherein the lengths Gx1 and Gy1 satisfy inequalities:

0≤

Gx1<

Gx/4 and 0≤

Gy1<

Gy/4.

7. The ground connection structure according to claim 6, wherein the lengths Gx1 and Gy1 satisfy equalities:

Gx1=Gy1=0.

8. The ground connection structure according to claim 5, wherein the antenna ground has a square shape.

9. A ground connection structure comprising:

an antenna device including;

an antenna ground having a first side which has a length Gx, and a second side which has a length Gy and is perpendicular to the first side, each of the lengths Gx and Gy being smaller than or equal to λ

/2 when a signal wavelength is defined as λ

, and

a first folded antenna element connected to the first side of the antenna ground,

a second folded antenna element connected to the second side of the antenna ground,

a circuit ground, and

a connector connecting the antenna ground and the circuit ground, wherein

the connector extends from a part of the circuit ground that does not face the antenna ground, and is connected to a center part of a third side of the antenna ground opposite from one of the first and second sides of the antenna ground.

10. The ground connection structure according to claim 9, wherein the connector extends parallel to the third side of the antenna ground.

11. The ground connection structure according to claim 9, wherein the circuit ground has a rectangular shape having a short side and a long side, and the short side and the one of the first and second sides are aligned while the long side faces the antenna ground.