Antenna apparatus and wireless communication device

1. An antenna apparatus comprising:

a ground plane;

a plurality of conductive elements arranged substantially in parallel to a surface of the ground plane;

a plurality of linear elements configured to connect the conductive elements to the ground plane; and

an antenna configured to radiate a radio wave,

wherein a first plurality of openings to reflect the radio wave radiated from the antenna are formed in the ground plane under an arrangement region of the conductive elements,

a second plurality of openings to further reflect the radio wave reflected on the ground plane toward the ground plane are formed in the conductive elements,

the second openings in the conductive elements are belt-shaped openings,

the belt-shaped openings in the conductive elements are parallel to a first direction which is one of a longitudinal direction and a lateral direction and arranged at a predetermined interval in a second direction which is the other of the longitudinal direction and the lateral direction; and

a length direction of the antenna is coincident with the first direction.

2. The apparatus according to claim 1 , wherein the linear elements are connected to belt-shaped element portions adjacent to the belt-shaped openings in each of the conductive elements.

3. A wireless communication device, comprising:

an antenna apparatus according to claim 1 ;

a feeding line connected to a feeding point of the antenna in the antenna apparatus; and

a wireless circuit configured to supply a current to the antenna via the feeding line.

4. An antenna apparatus comprising:

a ground plane;

a plurality of conductive elements arranged substantially in parallel to a surface of the ground plane;

a plurality of linear elements configured to connect the conductive elements to the ground plane; and

an antenna configured to radiate a radio wave,

wherein a plurality of first openings to reflect the radio wave radiated from the antenna are formed in the ground plane under an arrangement region of the conductive elements,

a plurality of second openings to further reflect the radio wave reflected on the ground plane toward the ground plane are formed in the conductive elements,

the second openings in the conductive elements are zigzag-shaped openings

the zigzag-shaped openings in the conductive elements are parallel to a first direction which is one of a longitudinal direction and a lateral direction and arranged at a predetermined interval in a second direction which is the other of the longitudinal direction and the lateral direction; and

a length direction of the antenna is coincident with the first direction.

5. The apparatus according to claim 4 , wherein the linear elements are connected to zigzag-shaped element portions adjacent to the zigzag-shaped openings in each of the conductive elements.

6. An antenna apparatus comprising:

a ground plane;

a plurality of conductive elements arranged substantially in parallel to a surface of the ground plane;

a plurality of linear elements configured to connect the conductive elements to the ground plane; and

an antenna configured to radiate a radio wave,

wherein a plurality of first openings to reflect the radio wave radiated from the antenna are formed in the ground plane under an arrangement region of the conductive elements,

a plurality of second openings to further reflect the radio wave reflected on the ground plane toward the ground plane are formed in the conductive elements,

the second openings in the conductive elements are meander-shaped openings

the meander-shaped openings in the conductive elements are parallel to a first direction which is one of a longitudinal direction and a lateral direction and arranged at a predetermined interval in a second direction which is the other of the longitudinal direction and the lateral direction; and

a length direction of the antenna is coincident with the first direction.

7. The apparatus according to claim 6 , wherein the linear elements are connected to meander-shaped element portions adjacent to the meander-shaped openings in each of the conductive elements.

8. An antenna apparatus comprising:

a ground plane;

a plurality of conductive elements arranged substantially in parallel to a surface of the ground plane;

a plurality of linear elements configured to connect the conductive elements to the ground plane; and

an antenna configured to radiate a radio wave,

wherein a plurality of openings to reflect the radio wave radiated from the antenna toward the ground plane are formed in each of the conductive elements.

9. The apparatus according to claim 8 , wherein the openings are arranged in a mesh pattern.

10. The apparatus according to claim 8 , wherein the conductive elements are arranged in a matrix pattern;

the openings are belt-shaped openings,

the belt-shaped openings are parallel to a first direction which is one of a longitudinal direction and a lateral direction of the matrix and arranged at a predetermined interval in a second direction which is the other of the longitudinal direction and the lateral direction; and

a length direction of the antenna is coincident with the first direction.

11. The apparatus according to claim 10 , wherein the linear elements are connected to belt-shaped element portions adjacent to the belt-shaped openings in each of the conductive elements.

12. The apparatus according to claim 8 , wherein the conductive elements are arranged in a matrix pattern;

the openings are zigzag-shaped openings

the zigzag-shaped openings are parallel to a first direction which is one of a longitudinal direction and a lateral direction of the matrix and arranged at a predetermined interval in a second direction which is the other of the longitudinal direction and the lateral direction; and

a length direction of the antenna is coincident with the first direction.

13. The apparatus according to claim 12 , wherein the linear elements are connected to zigzag-shaped element portions adjacent to the zigzag-shaped openings in each of the conductive elements.

14. The apparatus according to claim 8 , wherein the conductive elements are arranged in a matrix pattern;

the openings are meander-shaped openings

the meander-shaped openings are parallel to a first direction which is one of a longitudinal direction and a lateral direction of the matrix and arranged at a predetermined interval in a second direction which is the other of the longitudinal direction and the lateral direction; and

a length direction of the antenna is coincident with the first direction.

15. The apparatus according to claim 14 , wherein the linear elements are connected to meander-shaped element portions adjacent to the meander-shaped openings in each of the conductive elements.

16. A wireless communication device, comprising:

an antenna apparatus according to claim 8 ;

a feeding line connected to a feeding point of the antenna in the antenna apparatus; and

a wireless circuit configured to supply a current to the antenna via the feeding line.