Reconfigurable narrow-frame antenna for LTE/WWAN metal-rimmed smartphone applications

摘要

A reconfigurable narrow-frame coupled-loop antenna capable of providing hepta-band long term evolution/wireless wide area network (LTE/WWAN) for metal-rimmed smartphone applications is proposed. The ground clearance of this proposed antenna is only 7 × 70 mm2 which is promising for narrow-frame smartphone applications. Moreover, this proposed antenna can realise the miniaturisation by employing a positive intrinsic negative diode (PIN diode), which can provide two working states. When the PIN diode is OFF, it can provide coverage for GSM850/DCS/PCS/UMTS2100/LTE2300/2500 operations. When the PIN diode is ON, the obtained bands are GSM900/DCS/PCS/UMTS2100/LTE2300/2500. Hence, by combining these two working states, GSM850/900/DCS/PCS/UMTS2100/LTE2300/2500 operations are achieved. In addition, the feasibility of realising decoupled multi-antennas is demonstrated and its performances are well-suited for future smartphone applications. Detailed design considerations of the proposed antenna are described. Both experimental and simulated results are also presented and discussed.