| 摘要 |
PURPOSE:To transmit a broadcast wave to an on-vehicle receivier by applying a reception signal picked up by a loop antenna to various mounted receivers and detecting effectively a current induced on a car body by a broadcast wave. CONSTITUTION:A board 54 is provided to a header inner panel 38 to close a through hole 50 and the board 54 is fitted to the header inner panel 38 by a fixture 58. A loop antenna 48 consists of a single winding antenna, a resonance capacitor 60 is connected in series with an outer conductor of a coaxial cable 62, an insulation coating film is applied to the coil insulated electrically from a side lace 32 and arranged closely and the magnetic flux caused from the surface current is interlinked strongly with the loop antenna 48. the loop antenna 48 has a structure pressing it on the surface of the side lace 332 and placed within a distance of 12X10<-3>c/f(m) from the side ridge of the side lace 32 to attain high sensitivity reception (where (c) is the light velocity and (f) is a carrier frequency). Thus, the excellent detection with high sensitivity and less noise is attained.
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