A compact quad-band PIFA by using defected ground structure

The development of compact antennas plays an important role in rapidly growing mobile communication market. This paper presents a novel design technique of the quad-band small internal antenna which covers GSM-900/DCS-1800/PCS-1900/IMT-2000 bands. The handset antenna is developed within the limits of a 44times25times4 mm³ volume. This proposed antenna describes a new idea of increasing operational bandwidth for the compact planar inverted F antenna (PIFA). The proposed idea introduces the open-end slots in the ground plane almost all under the radiating patch. The size reduction method is attractive from the point of view of practical antenna implementation.