High-Efficiency Crossed-Loop 4G LTE Antenna for All Display Metal-Rimmed Smartphones

Table 1

Comparison of proposed antenna and reference antennas.

Ref.	Metal rim	Electrical component around the antenna	Maximum GND clearance (mm)	Bandwidth (MHz)	Efficiency (%)
[18]	No	No	5 mm	789–900/1680–2740	50–59/52–82
[19]	No	No	10 mm	660–1100/1710–3020	30–65/59–90
[20]	Yes	No	10 mm	824–960/1710–2690	45–60/>47%
[21]	Yes	No	5 mm	824–960/1710–2690	54–96
[22]	Yes	No	8 mm	824–960/1710–2690	>50% 50–78
[2]	Yes	No	2 mm	824–960/1710–2690	40–47/55–78
Proposed	Yes	Yes	2 mm	710–1030/1650–2620	52–65/48–75