Maestro A2200-A Bedienungsanleitung PDF herunterladen (Seite 28)

V1.0 – Aug-13

User’s Manual

Page 28 of 37

8 Use of External Antenna

8.1 Connection of RF Signal

The ANT_EXT pin is used to connect the receiver with the GPS antenna. The design

of the antenna connection has to be strictly done according to RF design rules. A 50

 PCB strip line is required. The following drawings shall explain the guidelines. A

major rule is to keep the strip line as short as possible. Additionally, Strip line needs

a good reference ground.

Figure 14: Antenna connector strip line A2235-H

In order to achieve the impedance of 50 , the width of the strip line needs to be

calculated. It depends on the thickness or height of the PCB layer (both parameters

are shown in following drawing). For the calculation, it is assumed that the PCB

material is FR4.

Figure 15: Strip line parameters A2235-H

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.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 36 37

Keine Kommentare

Maestro A2200-A Bedienungsanleitung Seite 28