Printed penta-band monopole slot antenna for application in the folder-type mobile phone

A penta-band monopole slot antenna for application in the folder-type mobile phone has been proposed and studied. By properly connecting the upper ground of the mobile phone to be at about the center of the side edge of the main ground using an extended connecting strip, variations of the antenna performances for the mobile phone in either the open or close states can be greatly reduced. In this study, the antenna can provide two wide bands to cover GSM850/900/1800/1900/UMTS operation, and good radiation characteristics over the operating bands have been obtained.