| 摘要 |
PURPOSE:To protect not only the amplifying element at the input stage of a receiver but the active element stored to the antenna basement from the electrostatic destruction, by discharging the static electricity caused at an antenna via a discharge element at the antenna side. CONSTITUTION:To discharge the static electricity caused between antennas 1 and 2, a discharge element 7 is connected between the earth and at least an output terminal, e.g. a terminal of the loop antenna 2 among the output terminals of loop antennas 1 and 2 that are connected in common to each other at each electric neutral point. The element 7 is stored to the antenna basement 3. The variable tuning circuits 8 and 9 are connected to the output terminals of antennas 1 and 2 respectivery. At the same time, the dipole antenna 5 is attached nearly at the center of the basement 3. In such constitution, the amplifying element at the input stage of a receiving circuit can be protected from an electrostatic destruction. Furthermore the MW tuner 16 can be protected from the destruction caused by the static electricity generated at the antenna 5. |
