A small-size double-sided threelayers inverted-F antenna suitable to be printed on the system circuit board for LTE 700 MHz, GSM 900/1800 MHz, WLAN 2400/5200/5800 MHz and WiMax 3500/5500 MHz is presented With mender microstrip line disperses on double-sided and coupled each other to produce enough bandwidth of low-band and multi-band of high-band, but also makes the size of the radiation side of the proposed antenna is 40 × 13 mm2 . Including the ground plane, the total antenna size is 0.8 mm × 87 mm × 40 mm of the FR4 substrate. This size and performance of this proposed antenna are suitable to the mobile phone.