In accordance with yet another feature of the invention, in order to counteract this reduction, the ground electrode is wrapped over the edge of the substrate at least at one point and preferably on both longitudinal sides of the planar filter and is extended over {HEAD ~ the rear side} of {TAIL ~ the substrate} in the form of a metallizing coating that is generally flat and continuous except for recesses in the region of the signal line leadthroughs 
In accordance with yet another feature of the invention , in order to counteract this reduction , the ground electrode is wrapped over the edge of the substrate at least at one point and preferably on both longitudinal sides of the planar filter and is extended over { HEAD ~ the rear side } of { TAIL ~ the substrate } in the form of a metallizing coating that is generally flat and continuous except for recesses in the region of the signal line leadthroughs
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