Antenna device

Patent metadata

Field	Value
Publication number	US-2019379109-A1
Application number	US-201916549356-A
Country	US
Kind code	A1
Filing date	Aug 23, 2019
Priority date	Feb 23, 2017
Publication date	Dec 12, 2019
Grant date	—

Abstract

An antenna device includes a case, a first antenna and a second antenna including a capacitance loading element. The capacitance loading element includes a turning-around area turning around in a front-rear direction on at least one of a front side and a rear side thereof. When the turning-around area is provided on the front side, at least part of the first antenna is situated in front of the turning-around area. When the turning-around area is provided on the rear side, at least part of the first antenna is situated behind the turning-around area. When the turning-around area is provided on the front side and on the rear side, at least part of the first antenna is situated at least one of in front of the turning-around area on the front side and behind the turning-around area on the rear side.

First claim

What is claimed is:

1 . An antenna device comprising:
a case; and a first antenna and a second antenna provided in the case, wherein the second antenna includes a capacitance loading element, the capacitance loading element includes a turning-around area turning around in a front-rear direction on at least one of a front side and a rear side thereof; when the turning-around area is provided on the front side, at least part of the first antenna is situated in front of the turning-around area of the capacitance loading element, when the turning-around area is provided on the rear side, at least part of the first antenna is situated behind the turning-around area of the capacitance loading element, and when the turning-around area is provided on the front side and on the rear side, at least part of the first antenna is situated at least one of in front of the turning-around area on the front side of the capacitance loading element and behind the turning-around area on the rear side of the capacitance loading element.

2 . The antenna device according to claim 1 , wherein
in the capacitance loading element, a voltage maximum point of a standing wave generated therein in a frequency band of the first antenna is shifted from an end portion of the capacitance loading element on the side of the first antenna, by the turning-around area in the front-rear direction.

3 . The antenna device according to claim 1 , wherein
in the capacitance loading element, an end portion of a current path of the capacitance loading element is shifted from an end portion of the capacitance loading element on the side of the first antenna, by the turning-around area in the front-rear direction.

4 . The antenna device according to claim 1 , further comprising:
an inner case provided in the case, wherein the capacitance loading element is held outside the inner case, and the first antenna is held inside the inner case.

5 . The antenna device according to claim 1 , further comprising:
an inner case provided in the case, wherein the second antenna includes a helical element, the capacitance loading element is held outside the inner case, and the helical element is held inside the inner case.

6 . The antenna device according to claim 5 , wherein
the helical element is situated below the capacitance loading element, when the turning-around area is provided on the front side, the helical element is situated behind the first antenna, when the turning-around area is provided on the rear side, the helical element is situated in front of the first antenna, and when the turning-around area is provided on the front side and on the rear side, the helical element is situated at least one of behind the first antenna and in front of the first antenna.

7 . The antenna device according to claim 1 , wherein
the capacitance loading element includes a turning-around area turning around in the front-rear direction from a starting point inside the capacitance loading element.

8 . The antenna device according to claim 7 , further comprising:
an inner case provided in the case, wherein the capacitance loading element is attached to an outside of the inner case through a connection portion provided adjacent to the starting point.

9 . The antenna device according to claim 1 , wherein
an edge of the capacitance loading element facing a side of the first antenna is obliquely inclined when viewed from a direction vertical to a direction in which the first antenna and the second antenna are aligned and a top-bottom direction.

10 . The antenna device according to claim 1 , wherein
the capacitance loading element has a turning-around area turning around in a top-bottom direction.

11 . The antenna device according to claim 1 , wherein
a third antenna is provided on a side opposite to the side where the first antenna is provided with respect to the capacitance loading element, and in the capacitance loading element, an area of the capacitance loading element on a side of the third antenna is partially extended to the side of the third antenna.

12 . The antenna device according to claim 1 , further comprising:
an inner case provided in the case, wherein the capacitance loading element includes a right plate-like portion and a left plate-like portion, the right plate-like portion and the left plate-like portion are separate portions, and the right plate-like portion and the left plate-like portion are held outside the inner case so that an upper end of the right plate-like portion and an upper end of the left plate-like portion are lower than an upper end of the inner case.

13 . The antenna device according to claim 1 , wherein
the first antenna and the second antenna are aligned in a front-rear direction, and the capacitance loading element is divided in a right-left direction, and at least parts of one and the other divisional portions are coupled in the right-left direction.

14 . The antenna device according to claim 1 , wherein
the first antenna and the second antenna are aligned in a front-rear direction, and in the first antenna, an area of a flat surface vertical to the front-rear direction is the largest.

Assignees

• Yokowo Seisakusho Kk

Inventors

• Terashita Noritaka
• Ono Motohisa

Classifications

• H01Q21/30 Primary

  Combinations of separate antenna units operating in different wavebands and connected to a common feeder system · CPC title

• H01Q1/42

  Housings not intimately mechanically associated with radiating elements, e.g. radome · CPC title

• H01Q1/362

  for broadside radiating helical antennas · CPC title

• H01Q1/521

  reducing the coupling between adjacent antennas · CPC title

• H01Q1/3275 Primary

  mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk · CPC title