Antenna device

Patent metadata

Field	Value
Publication number	US-10090604-B2
Application number	US-201615550088-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	Apr 24, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

An antenna device includes a main-reflector including a main-reflector hole, an additional main-reflector, a sub-reflector, and an additional sub-reflector. The main-reflector surrounds an outer edge of the additional main-reflector, and has a reflective surface on the same side as the additional main-reflector. The sub-reflector faces the main-reflector hole on the reflective surface side of the additional main-reflector, and has a reflective surface facing the reflective surface of the additional main-reflector. The additional sub-reflector surrounds an outer edge of the sub-reflector, and has a reflective surface on the same side as the sub-reflector. The main-reflector reflects an incident electromagnetic wave toward the additional sub-reflector, the additional sub-reflector reflects toward the additional main-reflector the electromagnetic wave reflected by the main-reflector, the additional main-reflector reflects toward the sub-reflector the electromagnetic wave reflected by the additional sub-reflector, and the sub-reflector reflects toward the reflector hole the electromagnetic wave reflected by the additional main-reflector.

First claim

The invention claimed is:

1. An antenna device comprising:
an additional main-reflector comprising a main-reflector hole and a first reflective surface;
a main-reflector encircling an outer edge of the additional main-reflector and comprising a second reflective surface on the same side as the first reflective surface of the additional main-reflector;
a sub-reflector facing the main-reflector hole, disposed at a side of the first reflective surface of the additional main-reflector, and comprising a third reflective surface facing the first reflective surface of the additional main-reflector; and
an additional sub-reflector encircling an outer edge of the sub-reflector, and comprising a fourth reflective surface on the same side as the third reflective surface of the sub-reflector,
wherein an electromagnetic wave incident on the main-reflector is reflected by the main-reflector toward the additional sub-reflector,
the electromagnetic wave reflected by the main-reflector is reflected by the additional sub-reflector toward the additional main-reflector,
the electromagnetic wave reflected by the additional sub-reflector is reflected by the additional main-reflector toward the sub-reflector, and
the electromagnetic wave reflected by the additional main-reflector is reflected by the sub-reflector toward the main-reflector hole.

2. The antenna device according to claim 1 , further comprising a receiver disposed at a side of the main-reflector and the additional main-reflector opposite to the second reflective surface of the main-reflector and the first reflective surface of the additional main-reflector,
wherein the electromagnetic wave reflected by the additional main-reflector passes through the main-reflector hole and is incident on the receiver.

3. The antenna device according to claim 1 , wherein a beam diameter of the electromagnetic wave:
matches an outer diameter of the main-reflector when the electromagnetic wave reaches the main-reflector,
matches an outer diameter of the additional sub-reflector when the electromagnetic wave reaches the additional sub-reflector,
matches an outer diameter of the additional main-reflector when the electromagnetic wave reaches the additional main-reflector,
matches an outer diameter of the sub-reflector when the electromagnetic wave reaches the sub-reflector, and
matches an outer diameter of the main-reflector hole when the electromagnetic wave reaches the main-reflector hole.

4. The antenna device according to claim 1 , wherein
the second reflective surface of the main-reflector has a paraboloid surface defined by rotation of a portion of a parabola around a central axis, the parabola having as a focal point a main-reflector focal point,
the first reflective surface of the additional main-reflector has an ellipsoid shape defined by rotation of a portion of an ellipse around the central axis, the ellipse having as focal points a first additional main-reflector focal point and a second additional main-reflector focal point,
the third reflective surface of the sub-reflector has a hyperboloid shape defined by rotation of a portion of a hyperbola around the central axis, the hyperbola having as focal points a sub-reflector focal point and the first additional main-reflector focal point,
the fourth reflective surface of the additional sub-reflector has a hyperboloid shape defined by rotation of a portion of a hyperbola around the central axis, the hyperbola having as focal points the main-reflector focal point and the second additional main-reflector focal point, and
the central axis passes through the sub-reflector focal point and the first additional main-reflector focal point.

5. The antenna device according to claim 1 , further comprising a controller to change a curvature of at least one of the additional main-reflector, the sub-reflector, or the additional sub-reflector.

6. The antenna device according to claim 1 , further comprising a set of
a supplemental main-reflector encircling an outer edge of the main-reflector, and
a supplemental sub-reflector encircling an outer edge of the additional sub-reflector.

7. The antenna device according to claim 1 , wherein a shape of the first reflective surface of the main-reflector is different than a shape of the second reflective surface of the additional main-reflector.

8. An antenna device comprising:
an additional main-reflector comprising a main-reflector hole and a first reflective surface;
a main-reflector encircling an outer edge of the additional main-reflector and comprising a second reflective surface on the same side as the first reflective surface of the additional main-reflector;
a sub-reflector facing the main-reflector hole, disposed at a side of the first reflective surface of the additional main-reflector, and comprising a third reflective surface facing the first reflective surface; and
an additional sub-reflector encircling an outer edge of the sub-reflector, and comprising a fourth reflective surface on the same side as the third reflective surface of the sub-reflector,
wherein an electromagnetic wave passing through the main-reflector hole is reflected by the sub-reflector toward the additional main-reflector,
the electromagnetic wave reflected by the sub-reflector is reflected by the additional main-reflector toward the additional sub-reflector, and
the electromagnetic wave reflected by the additional main-reflector is reflected by the additional sub-reflector toward the main-reflector.

9. The antenna device according to claim 8 , further comprising a primary radiator disposed at a side of the main-reflector and the additional main-reflector opposite to the second reflective surface of the main-reflector and the first reflective surface of the additional main-reflector,
wherein the electromagnetic wave emitted from the primary radiator passes through the main-reflector hole and is reflected by the sub-reflector.

10. The antenna device according to claim 9 , wherein the primary radiator is disposed facing the main-reflector hole and emits the electromagnetic wave toward the main-reflector hole.

11. The antenna device according to claim 9 , further comprising a redirecting reflector disposed at a side of the main-reflector and the additional main-reflector opposite to the second reflective surface of the main-reflector and the first reflective surface of the additional main-reflector,
wherein the primary radiator is disposed facing the redirecting reflector and emits the electromagnetic wave toward the redirecting reflector, and
the electromagnetic wave emitted from the primary radiator is reflected by the redirecting reflector toward the main-reflector hole.

12. The antenna device according to claim 8 , further comprising a sub-radiator at a side of the additional sub-reflector opposite to the fourth reflective surface of the additional sub-reflector,
wherein the additional sub-reflector transmits the electromagnetic wave emitted from the sub-radiator.

13. The antenna device according to claim 12 , further comprising a distribution circuit to distribute a signal to the sub-radiator.

14. The antenna device according to claim 13 , further comprising a phase shifter to control an excitation phase of the sub-radiator.

15. The antenna device according to claim 8 , further comprising a sub-radiator between the main-reflector and the additional main-reflector.

16. The antenna device according to claim 8 , wherein a shape of the first reflective surface of the main-reflector is different than a shape of the second reflective surface of the additional main-reflector.

Assignees

• Mitsubishi Electric Corp

Inventors

• Mizuno Tomohiro
• Kawaguchi Noboru
• Takanezawa Takashi
• Nishihara Hidenobu
• Ado Hiroto

Classifications

• H01Q19/17

  the primary radiating source comprising two or more radiating elements (H01Q19/15, H01Q25/00 take precedence) · CPC title

• H01Q19/13 Primary

  the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination (H01Q19/15 takes precedence) · CPC title

• H01Q19/18

  having two or more spaced reflecting surfaces (H01Q19/20 takes precedence) · CPC title

• H01Q15/147

  provided with means for controlling or monitoring the shape of the reflecting surface (for scanning H01Q3/01; aerials or aerial systems providing multiple beamwidths H01Q25/002) · CPC title

• H01Q19/19

  comprising one main concave reflecting surface associated with an auxiliary reflecting surface · CPC title