 The term PIFA is reserved by many authors ( e.g. Sánchez @-@ Hernández ) for the shorted patch antenna where the antenna element is wide with the ground plane underneath . The thin line type of inverted @-@ F antennae with the ground plane to one side like A and B in the diagram are just called IFA even if they are in planar format . An author may even call an IFA of this type a printed inverted @-@ F antenna but still reserve PIFA for the shorted patch type ( e.g. Hall and Wang . ) 
