GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 57 / 80
M66 provides an RF antenna pad for antenna connection. The RF trace in host PCB connected to the
module RF antenna pad should be coplanar waveguide line or microstrip line, whose characteristic
impedance should be close to 50Ω. M66 comes with grounding pads which are next to the antenna pad in
order to give a better grounding. Besides, a π type match circuit is suggested to be used to adjust the RF
performance.
To minimize the loss on the RF trace and RF cable, take design into account carefully. The following table
shows the requirement on GSM antenna.
Table 23: Antenna Cable Requirements
Cable insertion loss <1dB
Cable insertion loss <1.5dB
Table 24: Antenna Requirements
Depending by frequency band (s) provided by the network operator
4.1.2. RF Output Power
Table 25: The Module Conducted RF Output Power
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