HA31A Datasheet, PDF (18/24 Pages) Taoglas antenna solutions – 915MHz 2dBi Embedded Helical Monopole Antenna

7. Antenna Application Note
7.1 Matching Circuit for Different Ground Plane Variation
7.1.1 HAD.A.31 EVB Board
HAD.A.31 Ceramic 4 Ceramic 5 Ceramic 6
160mm
0 ohm
3pF
1.5pF
150mm
0 ohm
3.3pF
1.5pF
140mm
0 ohm
3.6pF
1.5pF
130mm
0 ohm
3.9pF
1.5pF
120mm
0 ohm
3.9pF
1.5pF
110mm
0 ohm
3.9pF
1.5pF
100mm
0.5pF
2pF
1.5pF
90mm
0.5pF
1pF
1.5pF
80mm
0.5pF
open
5.1nH
70mm
0.75pF
open
3.9pF
60mm
0.75pF
open
2.7pF
50mm
1pF
open
1pF
7.1.1 HAD.B.31 EVB Board
HAD.B.31 Ceramic 4 Ceramic 5
160mm
0 ohm
open
150mm
0 ohm
open
140mm
0 ohm
open
130mm
0 ohm
open
120mm
0 ohm
open
110mm
0 ohm
open
100mm
3.3pF
open
90mm
4.7pF
open
Ceramic 6
2.2pF
2.7pF
3pF
3pF
3pF
3.9pF
0 ohm
0 ohm
DSP-15-8- SPE-16-8-017/C/WY Page 18 of 24