Maestro Wireless Solution A5100-A User Manual page 30

Figure 15: Strip line parameters A5100-A
In this case, the width should be about 1.8 times the height of the PCB:
W = 1.8 x H
In the example, one would get a width of W = 1.8 x 0.8 mm = 1.44 mm.
V1.0-Mar-14 User's Manual Page 30 of 43