The antenna board of the present invention includes: a dielectric board where a plurality of dielectric layers are laminated, a ground conductor layer, a strip conductor, a first patch conductor, a second patch conductor, a third patch conductor, and a penetration conductor. The first patch conductor, the second patch conductor, and the third patch conductor are electrically independent of each other. The penetration conductor includes at least two penetration conductors aligned adjacent to each other in the extending direction of the strip conductor.
1. An antenna board comprising:
a first dielectric layer;
a strip conductor disposed on a top surface of the first dielectric layer so as to have an end part in a central part of the first dielectric layer, extending in one direction from an outer peripheral edge towards the end part;
a ground conductor layer disposed on a bottom surface side of the first dielectric layer;
a second dielectric layer laminated on a top surface side of the first dielectric layer and the strip conductor;
a first patch conductor disposed on a top surface of the second dielectric layer so as to cover a position of the end part of the strip conductor;
a third dielectric layer laminated on the second dielectric layer and the first patch conductor;
a second patch conductor disposed on a top surface of the third dielectric layer so that at least part of the second patch conductor covers a position where the first patch conductor is formed, being electrically independent;
a fourth dielectric layer laminated on the third dielectric layer and the second patch conductor;
a third patch conductor disposed on a top surface of the fourth dielectric layer so that at least part of the third patch conductor covers a position where the second patch conductor is formed, being electrically independent; and
at least two penetration conductors connecting the end part of the strip conductor and the first patch conductor by penetrating the second dielectric layer,
wherein the at least two penetration conductors align adjacent to each other in the one direction.
2. The antenna board according to claim 1 ,
wherein a center of the second patch conductor is deviated with respect to a center of the first patch conductor in an extending direction of the strip conductor, and
wherein a center of the third patch conductor is deviated with respect to the center of the second patch conductor in the extending direction of the strip conductor.
3. The antenna board according to claim 2 ,
wherein at least one auxiliary patch conductor is disposed on each side of the third patch conductor in a direction orthogonal to an extending direction of the strip conductor on the top surface of the fourth dielectric layer so as not to cover a position where the third patch conductor is formed, and
wherein the at least one auxiliary patch conductor is electrically independent of the third patch conductor.
4. The antenna board according to claim 3 , wherein the at least one auxiliary patch conductor is disposed to be deviated with respect to the third patch conductor in the extending direction of the strip conductor.
5. The antenna board according to claim 2 , wherein the second patch conductor is disposed so as to cover 80% or more of an area of a position where the first patch conductor is formed.
6. The antenna board according to claim 2 , wherein the third patch conductor is disposed so as to cover 80% or more of an area of a position where the second patch conductor is formed.
7. The antenna board according to claim 1 ,
wherein at least one auxiliary patch conductor is disposed on each side of the third patch conductor in a direction orthogonal to an extending direction of the strip conductor on the top surface of the fourth dielectric layer so as not to cover a position where the third patch conductor is formed, and
wherein the at least one auxiliary patch conductor is electrically independent of the third patch conductor.
8. The antenna board according to claim 7 , wherein the at least one auxiliary patch conductor is disposed to be deviated with respect to the third patch conductor in the extending direction of the strip conductor.
9. The antenna board according to claim 1 , wherein the at least two penetration conductors are disposed so as to have a center-to-center distance of 50 to 300 μm.