Slot antenna device

Patent metadata

Field	Value
Publication number	US-10601144-B2
Application number	US-201815945984-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Apr 13, 2017
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A slot antenna device includes: a first electrically conductive member having a first electrically conductive surface and a second electrically conductive surface; a second electrically conductive member having a third electrically conductive surface that opposes the second electrically conductive surface; a waveguide member on the second electrically conductive surface; and an artificial magnetic conductor extending on both sides of the waveguide member. The first electrically conductive member has a slot. The waveguide member an electrically-conductive waveguide that opposes the third electrically conductive surface. The waveguide member includes a first ridge and a second ridge. One end of the first ridge and one end of the second ridge are opposed to each other. As viewed from a direction perpendicular to the waveguide face, the slot is located between the one end of the first ridge and the one end of the second ridge.

First claim

What is claimed is:

1. A slot antenna device, comprising:
a first electrically conductive member having a first electrically conductive surface on a front side and a second electrically conductive surface on a rear side, and having at least one slot extending from the first electrically conductive surface through to the second electrically conductive surface;
a second electrically conductive member on the rear side of the first electrically conductive member, the second electrically conductive member having a third electrically conductive surface on the front side, the third electrically conductive surface opposing the second electrically conductive surface;
a ridge-shaped waveguide member on the second electrically conductive surface of the first electrically conductive member, the waveguide member having an electrically-conductive waveguide face that opposes the third electrically conductive surface and extending alongside the third electrically conductive surface; and
an artificial magnetic conductor on at least one of the second electrically conductive surface and the third electrically conductive surface, the artificial magnetic conductor extending on both sides of the waveguide member, wherein,
the third electrically conductive surface, the waveguide face, and the artificial magnetic conductor define a waveguide in a gap extending between the third electrically conductive surface and the waveguide face;
the waveguide member includes a first ridge and a second ridge;
one end of the first ridge and one end of the second ridge are opposed to each other;
as viewed from a direction perpendicular to the waveguide face, the at least one slot is located between the one end of the first ridge and the one end of the second ridge; and
the at least one slot is open to an external space through the first electrically conductive surface.

2. The slot antenna device of claim 1 , comprising a plurality of ridge-shaped waveguide members including the waveguide member, the plurality of waveguide members being on the second electrically conductive surface;
the first electrically conductive member has a plurality of slots including the at least one slot, the plurality of slots being arranged along a direction which intersects a direction that the waveguide member extends;
each of the plurality of waveguide members includes a plurality of ridges, such that ends of two adjacent ones of the plurality of ridges oppose each other;
as viewed from a direction perpendicular to waveguide faces of the plurality of waveguide members, each of the plurality of slots is located between the ends of two adjacent ones of the plurality of ridges; and
each of the plurality of slots is open to the external space through the first electrically conductive surface.

3. The slot antenna device of claim 2 , wherein,
the first electrically conductive member has a plurality of slots including the at least one slot, the plurality of slots being arranged along a direction that the waveguide member extends;
the waveguide member includes a plurality of ridges including the first ridge and the second ridge; and
as viewed from a direction perpendicular to the waveguide face, each of the plurality of slots is located between the opposing ends of two adjacent ones of the plurality of ridges; and
each of the plurality of slots is open to the external space through the first electrically conductive surface.

4. The slot antenna device of claim 2 , wherein the second electrically conductive member further has: a fourth electrically conductive surface on the rear side; and a port extending from the third electrically conductive surface through to the fourth electrically conductive surface and opposing the waveguide face of the waveguide member.

5. The slot antenna device of claim 3 , wherein the second electrically conductive member further has: a fourth electrically conductive surface on the rear side; and a port extending from the third electrically conductive surface through to the fourth electrically conductive surface and opposing the waveguide face of the waveguide member.

6. A radar device comprising:
the slot antenna device of claim 3 ; and
a microwave integrated circuit connected to the slot antenna device.

7. The slot antenna device of claim 5 , wherein the first electrically conductive surface of the first electrically conductive member has a shape that defines at least one horn communicating with the at least one slot.

8. The slot antenna device of claim 5 , wherein,
the artificial magnetic conductor includes a plurality of electrically conductive rods on the second electrically conductive surface; and
each of the plurality of electrically conductive rods have a leading end opposed to the third electrically conductive surface and a root connected to the second electrically conductive surface.

9. The slot antenna device of claim 7 , wherein the at least one slot have an H shape that includes a pair of vertical portions and a lateral portion connecting between central portions of the pair of vertical portions.

10. A radar device comprising:
the slot antenna device of claim 7 ; and
a microwave integrated circuit connected to the slot antenna device.

11. The slot antenna device of claim 1 , wherein,
the first electrically conductive member has a plurality of slots including the at least one slot, the plurality of slots being arranged along a direction that the waveguide member extends;
the waveguide member includes a plurality of ridges including the first ridge and the second ridge; and
as viewed from a direction perpendicular to the waveguide face, each of the plurality of slots is located between the opposing ends of two adjacent ones of the plurality of ridges; and
each of the plurality of slots is open to the external space through the first electrically conductive surface.

12. The slot antenna device of claim 11 , wherein the second electrically conductive member further has: a fourth electrically conductive surface on the rear side; and a port extending from the third electrically conductive surface through to the fourth electrically conductive surface and opposing the waveguide face of the waveguide member.

13. The slot antenna device of claim 12 , further comprising:
a third electrically conductive member having a fifth electrically conductive surface on the front side, the fifth electrically conductive surface opposing the fourth electrically conductive surface; and
a ridge-shaped second waveguide member on the fifth electrically conductive surface, the second waveguide member having an electrically-conductive waveguide face that opposes the fourth electrically conductive surface and extending alongside the fourth electrically conductive surface.

14. The slot antenna device of claim 12 , further comprising:
a third electrically conductive member having a fifth electrically conductive surface on the front side, the fifth electrically conductive surface opposing the fourth electrically conductive surface; and
a ridge-shaped second waveguide member on the fourth electrically conductive surface, the second waveguide member having an electrically-conductive waveguide face that opposes the fifth electrically conductive surface and extending alongside the fifth electrically conductive surface.

15. The slot antenna device of claim 1 , wherein the second electrically conductive member further has: a fourth electrically conductive surface on the rear side; and a port extending from the third electrically conductive surface through to the fourth electrically conductive surface and opposing the waveguide face of the waveguide

Assignees

• Nidec Corp
• Wgr Co Ltd

Inventors

• Kamo Hiroyuki
• Kirino Hideki

Classifications

• G01S13/347

  using more than one modulation frequency · CPC title

• G01S13/867

  Combination of radar systems with cameras · CPC title

• G01S19/51

  Relative positioning · CPC title

• G01S13/345

  using triangular modulation · CPC title

• G01S13/931

  of land vehicles · CPC title