Criteria and designs for surge couplers and back-filters

A review is presented of the principal areas in which surge coupling and filtering problems exist. It is proposed that each coupling mode be described in terms of the displacement of every line in the system with respect to ground. Rules are developed for specifying and designing surge coupling configurations, so that different surge test equipment can produce the same test results for a given piece of equipment under test (EUT). Three criteria are proposed, in the form of rules, as the basis for improved and better-standardized surge coupler/filters: surge the intended lines and no others; do not materially change the impedances driving EUT input lines; and allow at least some power follow