Abstract: A shielding string having a conductive surface is arranged between the surface of two juxtaposed parts of a housing for electronic circuits in a groove in one of the housing parts in order to attain shielding against high frequency. This shielding string is arranged before the assembling operation and can readily fall out again prematurely. In order to prevent it from falling out, the form of the groove has several abrupt changes in direction so that the shielding string is pressed against the walls of the groove due to its natural rigidity. Especially with the use of a shielding string with a wire texture at the surface, the grooves are widened in the proximity of the surface.