| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the miniaturization and production of a planar antenna and an antenna array by satisfying the specified relation between the depth of a corrugate structure and a wavelength in free space. SOLUTION: It the depth of a groove in the corrugate structure is defined as CL and the wavelength in the free space is defined asλo , the corrugate structure is constituted so as to satisfy the relation 0.05λo <=CL. A planar antenna 10 is constituted by using a substrate 11 composed of a dielectric and a conductor part 12 formed on the substrate 11, while having a tapered slot part 13 with which electromagnetic waves are radiated or made incident. The tapered slot part 13 is composed of an input part 13a, a curved line part 13b and on opening part 13c. At both the side ends of the conductor part 12 parallel to the radiating direction of electromagnetic waves, a corrugate structure 14 composed of plural grooves formed by periodically rectangularity removing the conductor part 12 is provided. Thus, even if the length of an antenna terminal from the opening part of the planar antenna is shortened, deterioration in the directivity of the planar antenna can be prevented.
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