▎ 摘　　要

NOVELTY - The filter (10) has a filter element (3) with a bellows (1) made of a pleated filter medium. A coil arrangement is integrated into the filter element. The surface of filter element is provided with the coil arrangement for inducing an electrical voltage. The coil arrangement is applied to surface of the bellows. The filter medium is formed from non-woven fabric, multi-layer non-woven fabric, multi-layer non-woven fabric with microfibers, multi-layer non-woven fabric with an activated carbon layer, multi-layer non-woven fabric with functional equipment against allergens and/or microbiological substances or from multi-layer non-woven fabric with an activated carbon layer and with functional equipment against allergens and/or microbiological substances and/or that the coil arrangement is formed from metallic fibers or from fibers with conductive, in particular metallic, particles or from a paste with electrically conductive particles or from graphene or graphene oxides . USE - Filter as interior air filter of filter arrangement for cabin of motor vehicle (all claimed), for filtering fluid flow i.e. air flow. ADVANTAGE - The filter can be manufactured in a simple manner since the coil arrangement is directly integrated in or on the filter element. The complicated connection of a coil arrangement is avoided. The voltage induced in the coil arrangement can be used to increase the electrostatic charge of the filter element and thus increase the degree of particle separation. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a filter arrangement; and (2) a method for increasing the electrostatic charge of a filter. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the filter. 1Bellows 3Filter element 10Filter 101Raw gas side LAir flow