Waveguide tube slot antenna and wireless device provided therewith

1. A waveguide tube slot antenna, comprising:

a plurality of waveguides arranged in parallel with each other and each extending in a tube axis direction;

a plurality of radiating slots formed along each of the plurality of waveguides at predetermined intervals in the tube axis direction; and

a plurality of waveguide tubes connected in parallel with each other,

wherein the plurality of waveguide tubes each comprise a first waveguide tube forming member and a second waveguide tube forming member each having a transverse section having a shape with an end, the first waveguide tube forming member and the second waveguide tube forming member being configured to define one of the plurality of waveguides by being coupled to each other,

wherein any one of the first waveguide tube forming member and the second waveguide tube forming member comprises the radiating slots and another one of the first waveguide tube forming member and the second waveguide tube forming member comprises a plurality of inner walls arranged at predetermined intervals in the tube axis direction, each of the plurality of inner walls reducing a cross sectional area in a direction perpendicular to the tube axis direction of the waveguide, and

wherein each of the plurality of inner walls is positioned immediately below a corresponding one of the plurality of radiating slots.

2. The waveguide tube slot antenna according to claim 1 , wherein the first waveguide tube forming member and the second waveguide tube forming member each have a shape with a corner part in the transverse section.

3. The waveguide tube slot antenna according to claim 1 , wherein the another of the first waveguide tube forming member and the second waveguide tube forming member comprises a power supply port.

4. The waveguide tube slot antenna according to claim 1 , wherein the plurality of waveguide tubes are separably connected in parallel with each other.

5. The waveguide tube slot antenna according to claim 1 , further comprising a plurality of recess parts arranged along the waveguide at predetermined intervals in the tube axis direction, each of the radiating slots opening in an inner bottom of a corresponding one of the recess parts.

6. The waveguide tube slot antenna according to claim 1 , wherein the first waveguide tube forming member and the second waveguide tube forming member are both formed of a resin and each comprise at least a conductive coating film formed on a defining surface of the waveguide.

7. The waveguide tube slot antenna according to claim 6 , wherein the resin comprises a liquid crystal polymer as a main ingredient thereof.

8. The waveguide tube slot antenna according to claim 6 , wherein the conductive coating film is set to have a film thickness of 0.2 μm to 1.5 μm.

9. The waveguide tube slot antenna according to claim 6 , wherein the conductive coating film is formed by stacking two or more kinds of metal plated coating films.

10. A wireless device, comprising the waveguide tube slot antenna of claim 1 .

11. A waveguide tube slot antenna, comprising:

a waveguide tube comprising a waveguide extending in a tube axis direction;

a plurality of radiating slots arranged along the waveguide at predetermined intervals in the tube axis direction; and

a plurality of inner walls arranged along the waveguide at predetermined intervals in the tube axis direction, each of the inner walls provided at a position immediately below a corresponding one of the plurality of radiating slots and reducing a cross sectional area in a direction perpendicular to the tube axis direction of the waveguide,

wherein the waveguide tube comprises a first waveguide tube forming member and a second waveguide tube forming member each having a transverse section having a shape with an end, the first waveguide tube forming member and the second waveguide tube forming member being configured to define the waveguide by being coupled to each other, and

wherein one of the first waveguide tube forming member and the second waveguide tube forming member comprises the radiating slots and another of the first waveguide tube forming member and the second waveguide tube forming member comprises the plurality of inner walls.

12. The waveguide tube slot antenna according to claim 11 , further comprising a power supply port,

wherein two of the plurality of inner walls adjacent to each other in the tube axis direction satisfy a relational expression of h 1 ≦h 2 , where h 1 represents a height dimension of one of the two inner walls on a side relatively close to the power supply port and h 2 represents a height dimension of another of the two inner walls on a side relatively far from the power supply port.

13. The waveguide tube slot antenna according to claim 11 , further comprising a plurality of recess parts arranged along the waveguide at predetermined intervals in the tube axis direction, each of the radiating slots opening in an inner bottom of a corresponding one of the recess parts.

14. The waveguide tube slot antenna according to claim 11 , wherein the first waveguide tube forming member and the second waveguide tube forming member are both formed of a resin and each comprise at least a conductive coating film formed on a defining surface of the waveguide.

15. The waveguide tube slot antenna according to claim 14 , wherein the resin comprises a liquid crystal polymer as a main ingredient thereof.

16. The waveguide tube slot antenna according to claim 14 , wherein the conductive coating film is set to have a film thickness of 0.2 μm to 1.5 μm.

17. The waveguide tube slot antenna according to claim 14 , wherein the conductive coating film is formed by stacking two or more kinds of metal plated coating films.

18. The waveguide tube slot antenna according to claim 11 , wherein:

the waveguide tube comprises a rectangular waveguide tube comprising:

a pair of wide walls having a relatively long transverse sectional dimension which are parallel with each other; and

a pair of narrow walls having a relatively short transverse sectional dimension which are parallel with each other;

any one of the pair of narrow walls comprises the plurality of radiating slots, and another of the pair of narrow walls comprises the plurality of inner walls; and

each of the first waveguide tube forming member and the second waveguide tube forming member comprises a respective one the pair of narrow walls.

19. The waveguide tube slot antenna according to claim 11 , wherein:

the waveguide tube comprises a rectangular waveguide tube comprising:

a pair of wide walls having a relatively long transverse sectional dimension which are parallel with each other; and

a pair of narrow walls having a relatively short transverse sectional dimension which are parallel with each other;

any one of the pair of wide walls comprises the plurality of radiating slots, and another of the pair of wide walls comprises the plurality of inner walls; and

each of the first waveguide tube forming member and the second waveguide tube forming member comprises a respective one of the pair of wide walls.

20. A wireless device, comprising the waveguide tube slot antenna of claim 11 .