FILTER DEVICE FOR AUTOMOBILE GLASS ANTENNA

摘要

PROBLEM TO BE SOLVED: To provide a filter device for an automobile glass antenna with excellent characteristics and quality by reducing noise with a frequency of an AM band or over in a filter device for the automobile glass antenna. SOLUTION: In theπ-type filter device for an automobile glass antenna where capacitors 2, 3 are connected across an inductor 1 connected between a battery terminal and a defogger terminal, the other terminals of the capacitors 2, 3 are connected separately to ground so as to prevent noise with a frequency of an AM band or over from creeping into the glass through the post-stage capacitor 3.