US 9,812,785 B2
Waveguide slot antenna and warning system using same
Tomokazu Sonozaki, Mie (JP); Hiroyuki Noda, Mie (JP); and Natsuhiko Mori, Mie (JP)
Assigned to NTN CORPORATION, Osaka (JP)
Appl. No. 14/898,943
Filed by NTN CORPORATION, Osaka (JP)
PCT Filed Jun. 16, 2014, PCT No. PCT/JP2014/065901
§ 371(c)(1), (2) Date Dec. 16, 2015,
PCT Pub. No. WO2014/203859, PCT Pub. Date Dec. 24, 2014.
Claims priority of application No. 2013-127613 (JP), filed on Jun. 18, 2013; and application No. 2014-040325 (JP), filed on Mar. 3, 2014.
Prior Publication US 2016/0372833 A1, Dec. 22, 2016
Int. Cl. H01Q 13/10 (2006.01); H01Q 13/22 (2006.01); H01Q 21/00 (2006.01); H01Q 1/24 (2006.01)
CPC H01Q 13/22 (2013.01) [H01Q 1/24 (2013.01); H01Q 13/10 (2013.01); H01Q 21/005 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A waveguide tube slot antenna comprising:
a waveguide tube having a transverse section having a rectangular shape in each part of a waveguide in an extending direction of the waveguide; and
a plurality of radiating slots arranged in the waveguide tube at predetermined intervals, wherein:
the waveguide tube comprises a first waveguide tube forming member and a second waveguide tube forming member each having the 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;
the first waveguide tube forming member is formed to have a flat shape and comprises the plurality of radiating slots;
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; and
the conductive coating film is formed by stacking two or more kinds of metal plated coating films.