Printed unipolar aerial for wireless communication appts., etc. aerial module to be incorporated in such appts., contains spiral copper foil on substrate, whose three conducting arms and one adjusting arm in specified configuration

摘要

The printed unipolar aerial (2) contains spiral Cu on substrate, with first conductive arm (21), extending along long part of substrate. Its first end contacts an edge of substrate and serves as signal input point.From second end of first arm extends orthogonally second conductive arm (22) to second end of third conductive arm (23), which is parallel to first arm. An adjusting arm (26) protrudes orthogonally from long third arm to first arm. Typically the substrate is rectangular. Fourth and fifth conductive arms (24,25) complete the aerial configuration.