| 摘要 |
PURPOSE:To effectively deal with both of such a case that stiffness extends over a wide range and such a case that stiffness is heavy within a narrow range, by setting the direction of the electromagnetic fields formed by a plurality of the antennae arranged to a printed circuit board so that said electromagnetic fields are converged on one side of said board but diffused on the other side thereof. CONSTITUTION:A printed circuit bard 6 is formed from twofold type disc made flat from a V-shape and the first antenna 7 is arranged to one of the twofold parts thereof while the second antenna 8 is arranged to the other. The flux center lines X1, X2 of the electromagnetic fields formed by said antennas 7, 8 are present on two lines passing the center of the plane formed by the antennae 7, 8 so as to cross each other at a right angle, and cross each other on one side of the printed circuit board 6 and separated from each other on the other side thereof. By this constitution, the electromagnetic field A on the side where the flux center lines X1, X2 cross each other is converged to be present within a narrow range but obtained intensively and the electromagnetic field B on the side where the flux center line X1, X2 separate from each other is diffused to become weak but obtained within a wide range. |
