Patent ID: 7859366

Claim:
A reflection-type bandpass filter for ultra-wideband wireless data communication, the filter comprising a substrate comprising a dielectric layer and a ground layer formed on a surface of the dielectric layer, a center conductor provided on a surface of the dielectric layer opposite the ground layer, and a side conductor provided on the surface of the dielectric layer opposite the ground layer, wherein there is a prescribed distance between the center and side conductors, with a non-conducting portion intervening therebetween, wherein one or more of a center conductor width, and the distance between the center and side conductors, are distributed non-uniformly in a length direction of the center conductor; and wherein length-direction distributions of the center conductor width and of the distance between the center and side conductors satisfy a design method based on a inverse problem of deriving a potential from spectral data in a Zakharov-Shabat equation.