User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 71 / 95
4.2.3. Passive Antenna
Figure 40: Reference Design with Passive Antenna
The above figure is a typical reference design with passive antenna.
C1, R1 and C2 are reserved matching circuit for antenna impedance modification. C1 and C2 are not
mounted by default; R1 is 0 ohm. Impedance of RF trace should be controlled as 50 ohm and the trace
length should be kept as short as possible.
4.3. Bluetooth Antenna Interface
MC20 provides a Bluetooth antenna interface. Bluetooth is a wireless technology that allows devices to
communicate, or transmit data/voice, wirelessly over a short distance. It is described as a short-range
communication technology intended to replace the cables connecting portable and/or fixed devices while
maintaining high level of security. Bluetooth is standardized as IEEE802.15 and operates in the 2.4 GHz
range using RF technology. Its data rate is up to 3Mbps.
MC20 is fully compliant with Bluetooth specification 3.0, and supports profiles including SPP and HFP-AG.
The module provides a Bluetooth antenna pad named BT_ANT, and the pin definition is listed below.