A dual-band antenna coupler for use in an adapter for portable radiotelephone. A plurality of curved bands of metal are positioned on a ground plane, with at least two of the plurality of curved bands of metal being electrically isolated from the ground plane so as to couple radio frequency (RF)...http://www.google.es/patents/US5852421?utm_source=gb-gplus-sharePatente US5852421 - Dual-band antenna coupler for a portable radiotelephone
Dual-band antenna coupler for a portable radiotelephone
