ATBECHDEFRGBITLILUNLSE0194583EUROPEAN PATENT APPLICATIONA319871014EP861029371986030654100319850306ES1987101419874219860917198638 6H 01Q 15/02 A 6H 04B 07:145 BenA passive process for the variation of the phases in the fresnel zonesfrProcédé passif de modification de phases dans la zone de FresneldePassives Verfahren zur Veränderung der Phasen in der FresnelzoneRADIO DESARROLLO, S.A. (RADESA)Gomez Moli, Maria ElenaATBECHDEFRGBITLILUNLSE19871014198742

57 The process consists in that electric bodies, transparent to the electromagnetic waves, are introduced into the paths thereof, so as to cover different Fresnel zones and thereby producing phase variations of the waves passing separately through each zone.