| 摘要 |
PURPOSE:To prevent failures in reception and transmission by means of a current for heating, by flowing heating currents with inverted phase to heaters provided with antenna elements. CONSTITUTION:A commercial power supply 1 is applied to a current controller 2, and a current is switched or a suitable adjusting current 21 is given to a branch point 5 with a frosting and snowing sensor 3 and a variable resistor 4. A current 7 from the point 5 heats an antenna element 9. Further, a phase converter 6 converts the current 7 into a phase converted current 8 having different phase by 180 deg., and the current also heats the element 9. Heaters in which the currents 7, 8 flow are provided in parallel, the phase is reverse with each other and the currents flow reverse. The magnetic fields produced as a result are cancelled with each other. Then, noo trouble is given in transmission and reception and since the heaters are arranged in parallel, transmission/reception electromagnetic waves can not be shielded. |
