User's Manual

• Filter and blocking capacitors should be placed directly in the tracks without stubs, to

achieve the best effect.

• Antenna matching elements should be placed close to the antenna / connector, block-

ing capacitors close to the module.

• Ground connections for the module and the capacitors should be kept as short as

possible and with at least one separate through hole connection to the ground layer.

• ESD protection elements should be placed as close as possible to the exposed areas.

Figure 9: Placement of the module with integrated antenna

16.2 Dimensioning of the micro strip antenna line

The antenna track has to be designed as a 50Ω feed line. The width W for a micro strip can

be calculated using the following equation:

W = 1.25 ×

5.98 × H

50×

√



+1.41

− T

met

(3)

Example:

A FR4 material with ε

= 4.3, a height H = 1000 µm and a copper thickness of T

met

= 18 µm