| 摘要 |
PURPOSE:To improve the performance while keeping small size by providing a loop antenna in a shield case opened in opposition to a metallic plate of a car body. CONSTITUTION:An aperture 34a is provided at a part of a roof rim bar 34 and an electrostatic shield case 10 is inserted into the aperture 34a. An aperture 10a from which a lengthwise side of the loop antenna 12 is provided to the case 10 and a part of the loop antenna 12 is arranged closely in opposition to the aperture ridge of the roof rim bar 34. Further, the fitting angle between the loop antenna 12 and the plane of the roof rim bar 34 is selected to 90-135 deg. or 225-270 deg. to said plane, the surface current induced on the surface of the car body is detected efficiently and a detection signal is amplified and processed by the circuit section 38 incorporated in the electrostatic shield case 10. Further, said case 10 is provided at the inside of the roof panel 24 and formed compact with excellent external appearance. |
