Antenna device and array antenna device

Patent metadata

Field	Value
Publication number	US-9490532-B2
Application number	US-201414758762-A
Country	US
Kind code	B2
Filing date	Jan 27, 2014
Priority date	Feb 7, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

An antenna device includes: a cavity part 1 composed of a metal conductor having an opening closed in a bottom; a first excitation circuit 10 superposed and disposed on the upper surface of the cavity part 1 , and including inside thereof a first power feeding probe 13 and a first transmission line 14 that feeds electric power to the first power feeding probe 13 , and radiating a radio wave of a first polarized wave; and a second cavity part 30 and a third cavity part 50 superposed and disposed on the upper surface of the first excitation circuit 10 , and composed of a metal conductor having open holes, and further includes, above the first excitation circuit 10 , a matching element 45 composed of a conductor.

First claim

The invention claimed is:

1. An antenna device comprising:
a cavity composed of a metal conductor having an opening closed in a bottom;
a first excitation circuit superposed and disposed on an upper surface of the cavity, including inside thereof a first power feeding probe and a first transmission line that feeds electric power to the first power feeding probe, and radiating a radio wave of a first polarized wave; and
a radiator superposed and disposed on an upper surface of the first excitation circuit, and composed of a metal conductor having an open hole,
the antenna device further comprising a first matching element composed of a conductor above the first excitation circuit; and between the first excitation circuit and the radiator, a second excitation circuit including inside thereof a second power feeding probe and a second transmission line that feeds electric power to the second power feeding probe, and radiating a radio wave of a second polarized wave orthogonal to the first polarized wave.

2. The antenna device according to claim 1 , wherein
the first matching element has a characteristic of matching a polarized wave excited by the first excitation circuit, and transmitting a polarized wave excited by the second exciting circuit, and
the antenna device further includes, above the second excitation circuit, a second matching element matching a polarized wave excited by the second excitation circuit, and transmitting the polarized wave excited by the first excitation circuit.

3. The antenna device according to claim 2 , wherein a height from the first excitation circuit to the first matching element and a height from the second excitation circuit to the second matching element are equal or substantially equal.

4. The antenna device according to claim 2 , wherein
the first matching element is a slit parallel to the polarized wave excited by the first excitation circuit, and
the second matching element is a slit parallel to the polarized wave excited by the second excitation circuit.

5. The antenna device according to claim 2 , wherein
the radiator is divided into a lower radiator and an upper radiator,
a dielectric substrate for a matching element is inserted between the lower radiator and the upper radiator,
the second matching element is formed on an upper surface of the dielectric substrate for the matching element,
the first matching element is formed on a lower surface of the dielectric substrate for the matching element, and
a sidewall of an open hole of the radiator is formed of a through-hole parallel to a tube axial direction and a copper foil on a surface orthogonal to the tube axial direction.

6. The antenna device according to claim 5 , further comprising:
a first vertical power feeding section extending a line from a start point of the first transmission line to an antenna lower part; and
a second vertical power feeding section extending a line from a start point of the second transmission line to the antenna lower part, wherein
the first and second vertical power feeding sections are formed in waveguide structures,
as a back-short section in the waveguide structure,
the antenna device includes an open hole in the lower radiator right above a start point of the first transmission line, and
a copper foil of the dielectric substrate for the matching element is formed as a short-circuit surface of the back-short section, or
the antenna device includes an open hole in the lower radiator right above a start point of the second transmission line, and
the copper foil of the dielectric substrate for the matching element is formed as the short-circuit surface of the back-short section.

7. The antenna device according to claim 5 , further comprising:
a first waveguide section communicating from the first excitation circuit to a lower surface of the cavity; and
a second waveguide section communicating from the second excitation circuit to the lower surface of the cavity, wherein
the first power feeding probe is configured of a third power feeding probe and a fourth power feeding probe opposed to each other,
the second power feeding probe is configured of a fifth power feeding probe and a sixth power feeding probe opposed to each other,
the first transmission line is configured of a third transmission line, one end portion of which is connected to the third power feeding probe, and a fourth transmission line, one end portion of which is connected to the fourth power feeding probe,
the second transmission line is configured of a fifth transmission line, one end portion of which is connected to the fifth power feeding probe, and a sixth transmission line, one end portion of which is connected to the sixth power feeding probe,
other end portions of the third transmission line and the fourth transmission line are connected to opposing parts of the first waveguide section, and phases of signals of the third transmission line and the fourth transmission line are adapted in phases opposite to each other, and
other end portions of the fifth transmission line and the sixth transmission line are connected to opposing parts of the second waveguide section, and phases of signals of the fifth transmission line and the sixth transmission line are adapted in phases opposite to each other.

8. The antenna device according to claim 7 , wherein
the first excitation circuit is divided into two layers of a third excitation circuit and a fourth excitation circuit,
the third transmission line is and the third power feeding probe disposed in the third excitation circuit,
the fourth transmission line is disposed in the fourth excitation circuit,
the second excitation circuit is divided into two layers of a fifth excitation circuit and a sixth excitation circuit, the fifth transmission line and the fifth power feeding probe is disposed in the fifth excitation circuit, and
the sixth transmission line is disposed in the sixth excitation circuit.

9. The antenna device according to claim 7 , wherein
the first excitation circuit is divided into two layers of a third excitation circuit and a fourth excitation circuit,
the third transmission line is disposed in the third excitation circuit,
the fourth transmission line is disposed in the fourth excitation circuit,
the third power feeding probe and the fourth power feeding probe are disposed between the third excitation circuit and the fourth excitation circuit, and
the second excitation circuit is divided into two layers of a fifth excitation circuit and a sixth excitation circuit, the fifth transmission line a is disposed in the fifth excitation circuit, and
the sixth transmission line is disposed in the sixth excitation circuit,
the fifth power feeding probe and the sixth power feeding probe are disposed between the fifth excitation circuit and the sixth excitation circuit.

10. The antenna device according to claim 1 , wherein
the first power feeding probe is configured of two probes directly opposed to each other, the probes being fed with electric power in phases opposite to each other or at a phase difference close to the opposite phases, and
the second power feeding probe is configured of two probes directly opposed to each other, the probes being fed with electric power in phases opposite to each other or at a phase difference close to the opposite phases.

11. An antenna device comprising:
a cavity composed of a metal conductor having an opening closed in a bottom;
a first excitation circuit superposed and disposed on an upper surface of the cavity, including inside thereof a first power feeding probe and a first transmission line that feeds electric power to the first power feeding probe, and radiat

Assignees

• Mitsubishi Electric Corp

Inventors

• Maruyama Takashi
• Takahashi Toru
• Hirota Akimichi
• Owada Tetsu
• Takahashi Tomohiro
• Mizuno Tomohiro

Classifications

• H01Q21/24

  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

• H01Q15/24

  Polarising devices; Polarisation filters  (H01Q15/12, H01Q15/22 take precedence) · CPC title

• H01Q13/06

  Waveguide mouths (horns H01Q13/02) · CPC title

• H01Q5/378

  Combination of fed elements with parasitic elements · CPC title

• H01Q21/064

  using horn or slot aerials (slotted waveguides arrays H01Q21/005) · CPC title