Antenna device

Patent metadata

Field	Value
Publication number	US-9685713-B2
Application number	US-201314655945-A
Country	US
Kind code	B2
Filing date	Jul 17, 2013
Priority date	Dec 28, 2012
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

An antenna device capable of performing precise positioning by using a small number of components and having a low side-lobe characteristic is provided. An antenna device includes a primary radiator ( 3 ), a main-reflector ( 2 ), a sub-reflector ( 5 ), and a holding section ( 4 ) that fixedly maintains relative positions and directions of the sub-reflector ( 5 ) and the main-reflector ( 2 ). The holding section ( 4 ) includes a side part ( 42 ) in an integrated manner, the side part ( 42 ) being configured to enclose at least a part of a radio-wave path extending from the primary radiator ( 3 ) to the sub-reflector ( 5 ) as a shroud.

First claim

The invention claimed is:

1. An antenna device comprising:
a primary radiator;
a main-reflector including an elliptic aperture;
a sub-reflector; and
a holding section fixedly maintaining relative positions and orientations of the sub-reflector and the main-reflector, the holding section including an integrated side part enclosing at least a portion of a radio-wave path extending from the primary radiator to the sub-reflector as a shroud.

2. The antenna device according to claim 1 , wherein the sub-reflector and the holding section are integrally formed.

3. The antenna device according to claim 1 , wherein:
the holding section further includes an enclosure part covering at least a portion of a radio-wave path extending from the sub-reflector to the main-reflector as a shroud;
the enclosure part extends from a top end of the side part and connects to at least a portion of a fringe part of the main-reflector; and
the enclosure part fixedly maintains a relative position and orientation of the main-reflector.

4. The antenna device according to claim 1 , wherein:
the main-reflector includes a front end and a rear end; and
the sub-reflector is disposed between the front end and the rear end of the main-reflector as measured in a horizontal direction.

5. The antenna device according to claim 1 , wherein the primary radiator is disposed inside the holding section.

6. The antenna device according to claim 1 , wherein the primary radiator is a horn antenna having a smooth inner wall surface.

7. An antenna device comprising:
a primary radiator;
a main-reflector;
a sub-reflector; and
a holding section fixedly maintaining relative positions and orientations of the sub-reflector and the main-reflector, the holding section including:
an enclosure part covering at least a portion of a radio-wave path extending from the sub-reflector to the main-reflector as a shroud, the enclosure part extending from a top end of the side part and connecting to at least a portion of a fringe part of the main-reflector, the enclosure part fixedly maintaining a relative position and orientation of the main-reflector; and
an integrated side part enclosing at least a portion of a radio-wave path extending from the primary radiator to the sub-reflector as a shroud.

8. The antenna device according to claim 7 , wherein the sub-reflector and the holding section are integrally formed.

9. The antenna device according to claim 7 , wherein:
the main-reflector includes a front end and a rear end; and
the sub-reflector is disposed between the front end and the rear end of the main-reflector as measured in a horizontal direction.

10. The antenna device according to claim 7 , wherein the primary radiator is disposed inside the holding section.

11. The antenna device according to claim 7 , wherein the primary radiator is a horn antenna having a smooth inner wall surface.

12. The antenna device according to claim 7 , wherein an aperture of the main-reflector is elliptic.

13. The antenna device according to claim 7 , wherein an aperture of the main-reflector is circular.

14. An antenna device comprising:
a primary radiator including a horn antenna having a smooth inner wall surface;
a main-reflector;
a sub-reflector;
a holding section fixedly maintaining relative positions and orientations of the sub-reflector and the main-reflector, the holding section including an integrated side part enclosing at least a portion of a radio-wave path extending from the primary radiator to the sub-reflector as a shroud.

15. The antenna device according to claim 14 , wherein the sub-reflector and the holding section are integrally formed.

16. The antenna device according to claim 14 , wherein:
the main-reflector includes a front end and a rear end; and
the sub-reflector is disposed between the front end and the rear end of the main-reflector as measured in a horizontal direction.

17. The antenna device according to claim 14 , wherein:
the holding section further includes an enclosure part covering at least a portion of a radio-wave path extending from the sub-reflector to the main-reflector as a shroud;
the enclosure part extends from a top end of the side part and connects to at least a portion of a fringe part of the main-reflector; and
the enclosure part fixedly maintains a relative position and orientation of the main-reflector.

18. The antenna device according to claim 14 , wherein the primary radiator is disposed inside the holding section.

Assignees

• Nec Corp

Inventors

• Takahashi Yoshihide

Classifications

• H01Q13/02

  Waveguide horns · CPC title

• H01Q1/1228

  on a boom · CPC title

• H01Q19/192 Primary

  with dual offset reflectors · CPC title

• H01Q19/191

  wherein the primary active element uses one or more deflecting surfaces, e.g. beam waveguide feeds · CPC title