To provide an antenna device, in which the problem of performance degradation of direct waves is solved.
The antenna device has a plurality of radiation fins 1 provided to a heat pipe 2, which conducts heat of a high frequency module 4 connected with an element antenna 3. It is provided with a dispersion means such as a wire netting 6, a dispersion plate 7, and unevenness 8, by which reflection of the direct wave in a specified direction on the upper end face 1a of the radiation fin 1 is interfered. Or when the wavelength of the direct wave is λ; (a) is a number of ≥1; (b) is an even number; and (c) is an integer ≥1, an interval of each fin between the adjacent radiation fins is λ/a (however, except in the range of ≥0.95 λ/b to ≤1.05 λ/b) or λa (however, except in the range of ≥0.95 λc to ≤1.05 λc), and the radiation fin 1 is provided randomly so that mathematical ordinality is not generated in a row equivalent to the size of the interval of the fins.
SASAKI TAKUO
NAITO IZURU
ITO OSAMU
KONISHI YOSHIHIKO
Toshihide Kodama
Takenaka Ikuo
Keigo Murakami