A filter has at least one capacitive element and an inductive element designed in stripline technology. In order to be able to design the filter using a simple microwave simulation program, its capacitive element is designed as a capacitor with the known serial parasitic inductivity and the inductive element is designed in stripline technology in such a way that it has at least one U-shaped stripline section, the parallel branches of which are set close together, but at the same time they are arranged further away from other stripline sections.