Maestro A2200-A Manual do Utilizador descarregar pdf (Página 29)

V1.0-Mar-14

User’s Manual

Page 29 of 43

8 Use of GPS & GLONASS Antennas

8.1 Connecting a GPS & GLONASS antenna to the GPS &

GLONASS receiver

The ANT pin is used to connect a GPS&GLONASS antenna to the receiver. The

design of the antenna connection has to be done strictly according to RF design

rules. A 50 Ω 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,

antenna ground (ANT_GND) should be routed to the ground plane of the PCB (the

ground plane is on a lower PCB layer) by vias as demonstrated in the drawing.

Figure 14: Antenna connector strip line A5100-A

In order to achieve the impedance of 50 Ω, 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.

Vias to Top Layer

Vias to GND Layer

GPS receiver solder pads

50Ωstrip line

Top view

ANT_INT

ANT_GND

Motherboard Bottom Layer

Motherboard Top Layer

ANT_INT

ANT_GND

GPS Receiver

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 42 43

Sem comentários

Maestro A2200-A Manual do Utilizador Página 29