ANTENNA DEVICE

• US 20150270622A1
• Filed: 03/11/2015
• Published: 09/24/2015
• Est. Priority Date: 03/20/2014
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takasaki, Atsushi, Yukimasa, Koji
• Granted Patent: US 9,825,369 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 15/0013 said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
• CPC Class Codes: H01Q 15/008 said selective devices having Sievenpipers' mushroom elements
• CPC Class Codes: H01Q 21/24 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 Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/385 Two or more parasitic elements
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

An antenna device comprises a cell structure including a plurality of cells made up of a multi-layer structure including a conductor layer and a dielectric layer, arranged in a matrix, and further comprises a first antenna element and a second antenna element arranged over the cell structure. The cells are configured to have artificial magnetic conductor effects corresponding to different frequency bands in a first direction and a second direction, and the first antenna element and the second antenna element are arranged parallel to the surface of the cell structure, respectively along the first direction and the second direction.

Claims

1. An antenna device comprising a cell structure including a plurality of cells made up of a multi-layer structure including a conductor layer and a dielectric layer, arranged in a matrix, and further comprising a first antenna element and a second antenna element arranged over the cell structure,

wherein the cells are configured to have artificial magnetic conductor effects corresponding to different frequency bands in a first direction and a second direction, and

the first antenna element and the second antenna element are arranged parallel to the surface of the cell structure, respectively along the first direction and the second direction.

2. The antenna device according to claim 1, wherein the first antenna element exhibits resonance in the first direction, and the second antenna element exhibits resonance in the second direction.

3. The antenna device according to claim 1,

wherein the first antenna element exhibits resonance in a frequency bandwidth in which a reflected wave phase is not 180°

relative to electromagnetic waves in the first direction, and

the second antenna element exhibits resonance in a frequency bandwidth in which a reflected wave phase is not 180°

relative to electromagnetic waves in the second direction.

4. The antenna device according to claim 1,

wherein the first antenna element exhibits resonance in a frequency bandwidth in which a reflected wave phase is 45°

to 135°

relative to electromagnetic waves in the first direction, and

the second antenna element exhibits resonance in a frequency bandwidth in which a reflected wave phase is 45°

to 135°

relative to electromagnetic waves in the second direction.

5. The antenna device according to claim 1,

wherein the first antenna element is arranged such that a distance from the cell structure is shorter than ¼

a wavelength of a frequency at which the first antenna element exhibits resonance, and

the second antenna element is arranged such that a distance from the cell structure is shorter than ¼

a wavelength of a frequency at which the second antenna element exhibits resonance.

6. The antenna device according to claim 1, wherein the first antenna element and the second antenna element are arranged at mutually different distances from the cell structure.

7. The antenna device according to claim 1, wherein the first antenna element and the second antenna element are arranged so as to exhibit resonance in orthogonal directions.

8. The antenna device according to claim 1, wherein a conductor in the conductor layer is rectangular.

9. The antenna device according to claim 1, wherein the first antenna element and the second antenna element are each a dipole antenna.

10. The antenna device according to claim 1, wherein the first antenna element and the second antenna element form an inverted F antenna.