Semifinite terminated electric wave filters

Specially designed filters to work between a finite resistance at one end and an open circuit or a short circuit at the other end can be made to duplicate exactly the attenuation and phase-shift characteristics of image parameter filters terminated in equal resistances. By doing so a 6-decibel flat gain and considerably higher frequency limit due to parasitic elements can be obtained without added cost. The design procedure follows exactly that of the well-known image parameter filters. A set of algebraic equations express the new element values in terms of the values for image parameter filters.