Antenna device

Patent metadata

Field	Value
Publication number	US-2021151902-A1
Application number	US-202017132698-A
Country	US
Kind code	A1
Filing date	Dec 23, 2020
Priority date	Jul 5, 2018
Publication date	May 20, 2021
Grant date	—

Abstract

An antenna device according to an aspect of the present disclosure includes a zeroth-order resonant antenna and a first-order resonant antenna. The zeroth-order resonant antenna includes a base plate, a platy radiation element, and a connection conductor connecting the base plate and the platy radiation element. The zeroth-order resonant antenna is configured to transmit and/or receive a first linearly polarized radio wave in all directions perpendicular to the first linearly polarized radio wave by zeroth order resonance. The first-order resonant antenna includes the base plate shared with the zeroth-order resonant antenna, and a first radiation element located on the same plane as the base plate. The first-order resonant antenna is configured to transmit and/or receive a second linearly polarized radio wave perpendicular to the first linearly polarized radio wave by first order resonance.

First claim

What is claimed is:

1 . An antenna device comprising:
a zeroth-order resonant antenna configured to transmit and/or receive a first linearly polarized radio wave in all directions perpendicular to the first linearly polarized radio wave by zeroth order resonance; and a first-order resonant antenna configured to transmit and/or receive a second linearly polarized radio wave perpendicular to the first linearly polarized radio wave by first order resonance, wherein the zeroth-order resonant antenna includes
a base plate,
a platy radiation element spaced from the base plate, the platy radiation element facing the base plate, the platy radiation element being configured to be supplied with power, and
a connection conductor electrically connecting the platy radiation element and the base plate, and
the first-order resonant antenna includes
the base plate shared with the zeroth-order resonant antenna, and
a first radiation element located on a same plane as the base plate, the first radiation element being configured to be supplied with power.

2 . The antenna device according to claim 1 , wherein
the first radiation element has a first end connected to the base plate, and a second end configured to be supplied with power.

3 . The antenna device according to claim 2 , wherein
the first radiation element and the base plate of the first-order resonant antenna form a first closed loop.

4 . The antenna device according to claim 3 , wherein
the first-order resonant antenna includes a second radiation element located inside the first closed loop, the second radiation element has a first end connected to the base plate, and a second end configured to be supplied with power, and the second radiation element and the base plate of the first-order resonant antenna form a second closed loop.

5 . The antenna device according to claim 1 , wherein
a part or whole of the first radiation element does not overlap the platy radiation element in a direction perpendicular to the base plate.

6 . The antenna device according to claim 1 , wherein
the platy radiation element has a polygonal shape having at least one acute internal angle and at least one obtuse angle, a part of the platy radiation element located in a vicinity of a vertex corresponding to the at least one obtuse internal angle is configured to be supplied with power.

7 . The antenna device according to claim 1 , wherein
the first-order resonant antenna is a first first-order resonant antenna, the antenna device further comprises: a second first-order resonant antenna different from the first first-order resonant antenna, wherein the second first-order resonant antenna is configured to transmit and/or receive a third linearly polarized radio wave perpendicular to the first linearly polarized radio wave by first order resonance, the second first-order resonant antenna includes
the base plate shared with the zeroth-order resonant antenna, and
a third radiation element located on the same plane as the base plate, the third radiation element being configured to be supplied with power.

8 . The antenna device according to claim 1 , wherein
the first-order resonant antenna is a first first-order resonant antenna, the antenna device further comprises: a third first-order resonant antenna different from the first first-order resonant antenna, wherein the third first-order resonant antenna includes the base plate shared with the zeroth-order resonant antenna, and the third first-order resonant antenna is configured to transmit and/or receive the first linearly polarized radio wave by first order resonance.

9 . The antenna device according to claim 1 , further comprising:
a hollow casing that has a side face portion including a platy conductor, wherein the base plate is located outside the casing and on the side face portion, and the base plate is connected to the platy conductor of the side face portion.

10 . The antenna device according to claim 1 , wherein
the antenna device is mounted on a vehicle, the first linearly polarized radio wave is a vertically polarized wave, and the second linearly polarized radio wave is a horizontally polarized wave.

11 . The antenna device according to claim 1 , wherein
the antenna device is mounted on a vehicle such that the first radiation element is located on a front side of the vehicle with respect to the base plate.

Assignees

• Denso Corp

Inventors

• Sugimoto Yuji
• Koide Shiro

Classifications

• H01Q21/24 Primary

  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 title

• H01Q1/3275

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

• H01Q1/32

  Adaptation for use in or on road or rail vehicles · CPC title

• H01Q5/307

  Individual or coupled radiating elements, each element being fed in an unspecified way · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title