Ignition distributor cap with a shielding hood and shielding hood, therefor

A distributor cap of an ignition distributor for Otto engines, comprising a shielding hood, which serves to suppress radio interference and is made of an electrically conductive material and has holes for receiving the domes of the distributor cap, wherein a high-voltage electrode extends through each of said domes, which are surrounded by sleeves made of an electrically conductive material, which is connected to the electrically conductive material of the shielding hood, characterized in that the capacitance of the capacitor, which is constituted by the sleeve of electrically conductive material that surrounds the associated dome, and by the high-voltage electrode that extends through the dome, an interference suppressing resistance in the dome and the inductances associated with the high voltage electrode are so matched, the capacitance being determined by the arrangement of the electrically conductive material on the associated dome, that in combination with the high-voltage electrode an electric filter is provided, which effects a strongly pronounced attenuation at the frequencies of a predetermined radio reception range, namely, of the very high frequency range, particularly of the very high frequency sound broadcasting range and the radiotelephone ranges.