Abstract: The design of a compact internal multiband folded loop antenna for GSM850/900/GPS/DCS1800/PCS1900/UMTS2100 multiple mobile operation has been proposed. The whole antenna structure consists of a single folded meander loop track and a T-shape back-coupling element, whereas the loop pattern is activated through the electromagnetic coupling mechanism by the T-shape element which is connected to the microstrip feeding line. The size of the total structure is 114 mm×61.6 mm×6 mm, meanwhile the area left for the loop track is only 61.6 mm×15 mm×6 mm. The compact structure makes the design very suitable for the mobile phone requirements for slim space. The design and optimizing of the performance of the proposed antenna were performed by using the simulator software HFSS. An actual model has been prototyped for testing. Measured and electromagnetic simulated results are in good agreement, thus indicating that the proposed antenna can meet the actual demands.

Key words: handset antenna; folded loop antenna; multi-band antenna; impedance bandwidth bandwidth