Octaband WWAN/LTE Dual-Antenna System Decoupled by Two Neutralization Lines with Inductors for Smart Phones

Table 1

Figures of merit of octaband WWAN/LTE dual-antenna system.

References	Dimension (mm^3)	Decoupling method	Mutual coupling	Frequency band^a	Efficiency (%)^b
[18]	—	Characteristic mode	−10 dB	GSM900	>70
[19]	—	Characteristic mode	−7.4 dB	GSM900	>40
[20]	—	One neutralization line	−8 dB	LTE700/LTE2500	>15
[21]	60 × 10 × 4	One neutralization line	−10 dB	Heptaband	>40
[22]	80 × 15 × 5	Cross-neutralization line	−10 dB	Octaband	>30
[23]	80 × 15 × 7	Grounded branch	−10 dB	Octaband	>32
Proposed	80 × 15 × 6.8	Two neutralization lines	−10 dB	Octaband	>42

Heptaband: GSM850, GSM900, DCS, PCS, UMTS, LTE2300, and LTE2500. Octaband: heptaband with LTE700. Efficiency: the lowest efficiency within the frequency band.