| 摘要 |
PURPOSE:To reduce the air-resistance possibly and to avoid hindrance at emission, by implanting antenna elements in the base of a flying body via a dielectric substance body. CONSTITUTION:The external surface of the 2nd element 22 of transmission type mounted on a flying body is made in coincidence with the level of the surface 11 of the fitting base 10 of cylindrical type, and all the 1st and 2nd elements 21, 22 of the antenna are implanted in the base 10. The elements 21, 22 are enclosed with a dielectric substance body 60 and isolated from the base 10. Power is given to the feeding point 40 of the element 22 with the feeding line 30 (coaxial cable consisting of center conductor 31 and external conductor 32). The groove provided at the base 10 implanting the antenna is made vertical to the long axis and it is engraved from the level of the surface 11 corresponding to the height of the element 21 to the position of the level 12 inside the base 10, and a ground point 50 is located on the position of the level 12 and the lower end of the element 21 is grounded. Since the inside of the base 10 is enclosed with the dielectric substance body 60, the total actual length of the antenna is shorter and the air-resistance is less because no external projection from the surface 11 is in existence. |
