HIGH FREQUENCY NOISE FILTER FOR ON-VEHICLE EQUIPMENT, AND FILTER CONNECTION METHOD

PROBLEM TO BE SOLVED: To achieve a sufficient noise reduction effect in a frequency band supposed in a design stage even if a grounded conductor is not exposed near a load on a vehicle radiating electromagnetic noise.SOLUTION: A high frequency noise filter 10A for on-vehicle equipment includes terminals at one end P1 and the other end P2 each connectable with a plurality of electrical wires. A power line 31 and one end 22a of a load are connected to the one end P1 of the high frequency noise filter 10A for on-vehicle equipment, the other end 22b of the load is not grounded but connected to the other end P2 of a self-resonant filter via a first electrical wire 27, and the other end P2 of the self-resonant filter is connected to a ground connection point 28 via a second electrical wire 26. An inductor component Le of the second electrical wire 26 does not influence the resonant frequency of the filter, so that a characteristic degradation with a changing attenuation-frequency characteristic is prevented.