User's Manual

M10 Hardware Design
M10_HD_V3.0 - 65 -
4. Antenna interface
The Pin 43 is the RF antenna pad. The RF interface has an impedance of 50Ω. A reference circuit
is shown in following figure. By default, the resistor R1 is 0 ohm and capacitor C1 and C2 are not
mounted.
MODULE
RF_ANT
R1 0R
C1
NM
C2
NM
Figure 46: Reference circuit of RF interface
4.1. Antenna installation
M10 provides an RF antenna PAD for customer’s antenna connection. The RF trace in host PCB
connecting to the module RF antenna pad should be micro-strip line or other types of RF trace,
whose characteristic resistance should be close to 50Ω. M10 comes with two grounding pads
which are next to the antenna pad in order to give a better grounding.
Table 27: Pin definition of the RF_ANT
To minimize the loss on the RF trace and RF cable, they should be designed carefully. It is
recommended that the insertion loss should try to meet the following requirements:
 GSM850/EGSM900<1dB

DCS1800/PCS1900<1.5dB
Name Pin Function
RF_ANT 43 RF antenna pad
GND 42 Ground
GND 44 Ground