| 摘要 |
PROBLEM TO BE SOLVED: To obtain excellent directivity by making the thickness of the case smaller. SOLUTION: A radiation part 2 is formed so that its length is nearly 0.25 times the element length of a usable wavelength and hung from an arrangement base 10 via a holding tool 11. A square bottom board 3 which orthogonally crosses the radiation part 2 is disposed so that its four sides are parallel with the sides of the arrangement base 10. The length of one side of the bottom board 3 is set to be nearly 0.5 times the usage wavelength. A pair of three holding boards 60 is arranged on two straight lines which are directed from an opposite direction to the radiation part 2. Circular conductors 5 are formed by printing on the respective holding boards 60 so that they face the radiation part 2. The holding boards 60 are arrayed at an equal interval D1 which is nearly 0.25 times the usage wavelength. Each circular conductor 5 is formed to be a circle with a diameter D2 which is nearly 0.25 times the usage wavelength.
|
