Antennas Design for Multistandard Terminals

The present work relates to the antenna design for mobile terminals. It's about PIFA antennas (Planar Inverted- F- Antenna). The modification of the certain existing structures geometrical forms allowed the operation of those according to current standards. The design is performed by using the SuperNEC and HFSS simulators. The conception of four antennas: broadband, Bi-band, tri-band and quadriband operating at resonant frequencies used in the different communications standards (GSM900, DCS1800, UMTS, WiMAX…), are presented. The obtained results show a very good matching at the desired frequencies with a weak congestion.