US 7,446,730 B2
	Radio wave device
Naruto Yonemoto, Fuchu (Japan); and Motoharu Matsuzaki, Ota-ku (Japan)
Assigned to Electronic Navigation Research Institute, Tokyo (Japan); and Lenstar Co., Ltd, Tokyo (Japan)
Appl. No. 11/596,575 PCT Filed Mar. 09, 2005, PCT No. PCT/JP2005/004108 § 371(c)(1), (2), (4) Date Nov. 15, 2006, PCT Pub. No. WO2005/112189, PCT Pub. Date Nov. 24, 2005.
Claims priority of application No. 2004-148359 (JP), filed on May 18, 2004.
Prior Publication US 2007/0252776 A1, Nov. 01, 2007
Int. Cl. H01Q 1/42 (2006.01)

U.S. Cl. 343—872  [343/705; 343/708]

25 Claims

1. In a radio wave apparatus which has a housing for protection which protects the radio wave device arranged inside, and said radio wave device arranged inside the housing for protection, said radio wave apparatus comprising: said housing for protection consists of a styrene foam structure and a dielectric thin film, forming said styrene foam structure in the circumference of said radio wave device with styrene foam, said styrene foam has the specific inductive capacity which is transparent to a radio wave, said dielectric thin film surrounds the surface of said styrene foam structure, is high hardness and forms thin enough compared with a wavelength, said radio wave device is a spherical dielectric electromagnetic lens, said styrene foam structure covers the surface of said dielectric electromagnetic lens, having a radius equal to the focal length of said dielectric lens, and wherein said styrene foam is stuck to the circumference of said radio wave device enclosed therein, wherein said dielectric thin film is a dielectric paint film of coated resin, and said dielectric paint film is a paint film of non-solvent urethane resin (EFRETHANE).