Watchstrap-Embedded Four-Element Multiple-Input–Multiple-Output Antenna Design for a Smartwatch in 5.2–5.8 GHz Wireless Applications

Figure 6

(a) Structures with four and two via holes. (b) Simulated S11 and S21 and (c) S31 and S41 for the four-element MIMO antenna with via holes. (d) Simulated surface current distributions over the four and two via holes at 5.8 GHz.

(a)

(b)

(c)

(d)