SIM802 Hardware Design
4 Antenna interface
z
The Pin 45 is the GSM RF antenna pad. The RF interface has an impedance of 50
Ω
.
z
The Pin 33 is the SRD RF antenna pad. The RF interface has an impedance of 50
Ω
.
4.1 Antenna installation
4.1.1 Antenna pad
SIM802 provides RF antenna interface. And customer’s antenna should be located in the
customer’s main board and connect to module’s antenna pad through microstrip line or other type
RF trace which impendence must be 50
Ω
. To help you to ground the antenna, SIM802 comes
with a grounding plane located close to the antenna pad. The antenna pad of SIM802 is shown as
figure
36:
Figure 36: RF Pad (Bottom view)
NOTE
：
Please do reassure that there isn’t any trace under GSM antenna pad and SRD antenna
pad when you paste SIM802 to your main PCB. You can play traces under the pads only when
there is a ground plane separated from disturbing.
SIM802 material properties:
SIM802 PCB material: FR4
Antenna pad: Gold plated pad
SIM802_HD_V2.01
12.01.2010
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