User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 72 / 95
Table 31: Pin Definition of the BT_ANT
The external antenna must be matched properly to achieve the best performance, so the matching circuit
is necessary. The connection is recommended as in the following figure:
MC20 Module
BT_ANT
0R
NM
NM
Figure 41: Reference Design for Bluetooth Antenna
There are some suggestions for component placement and RF trace layout for Bluetooth RF traces:
 Antenna matching circuit should be closed to the antenna;
 The impedance of RF trace should be controlled as 50Ω;
 The RF traces should be kept far away from the high frequency signals and strong disturbing source.
The proposed antenna type is Chip antenna,and the detailed description is as follows:
Table 32: Recommended Antenna Specifications
Pin Name Pin No. Description
BT_ANT 32 BT antenna pad
GND 31 Ground
ITEM SPECIFICATION
Type Chip Antenna
Frequency Band 2.40GHz~2.50GHz