It proposes a compact internal multiband antenna with a simple structure for GSM850/GSM900/DCS1800/PCS1900/UMTS2100/LTE 2.3 GHz/WiMax 2.5 GHz/LTE 2.6 GHz multiple mobile operations. The whole structure of the proposed antenna consists of the double strip planar radiation with a single feed and the printed circuit board (PCB) with a proper rectangular slot. The short one of the double strips resonated at 2 600 MHz

while the other resonated at 900 MHz. By the combination of the two strips

they resonated at 1 900 MHz. The slot on PCB could extend the length of the current distribution on the ground of PCB. The size of the total structure of the proposed antenna is 115 mm×60 mm×6 mm; meanwhile

the area left for the antenna is 60 mm×15 mm×6 mm. The simple compact structure makes the design very suitable for the mobile phone. The design and optimizing of the performance of the proposed antenna were performed by using the simulator software Ansoft HFSS. An actual model has been prototyped for testing. Measurement and simulation results are in good agreement

thus indicating that the proposed antenna can meet the actual demands.