A High on- Body Efficiency Mobile Phone Antenna

Antenna efficiency is an important indicator in mobile phone antenna design, which is related to the most basic experience of mobile phones. Especially under the influence of human tissues such as the head and hands, the antenna efficiency may drop to a very low level. This paper proposes a dual-loop antenna, which uses differential feeding to improve the on-body efficiency of mobile phones. It can cover the frequency band of DCS1800, PCS1900, UMTS, LTE2300, and LTE2500 with a narrow ground clearance of 1mm. The free space efficiency and the on-body efficiency of the antenna are both high, which makes it a desired candidate for 5G mobile communication.