| 摘要 |
PURPOSE:To attain the reception of broadcast signals clearly without noise on the signals, by mixing silicon carbide powder having the property absorbing noise in electromagnetic waves through induction, in a synthetic resin. CONSTITUTION:A bar antenna case A is constituted with semicylindrical halves 1, 2 connected with a thin thickness part 3 freely snatchably, and after a bar antenna (not shown in diagram) is contained in the inside, both halves 1, 2 are closed and projections 4 for coupling provided at the ridge are pressed in holes (not shown in diagram) at the other ridge. The case A like this can be manufactured by mixing silicon carbide powder in a synthetic resin and molding the mixture with a mold throug heating, or by pressing the resin sheet mixed with the silicon carbide in a mold through heating. Since the mixed silicon carbide of the case has the property absorbing noise on electromagnetic waves through induction, the noise is broadcast signals can be eliminated, allowing to receive clear broadcast signals. |
