Smart Machine Smart Decision
SIM800H _Hardware Design_V2.03
48
2016-10-10
R101
，
C101
，
C102 are the matching circuit, the value should be defined by the antenna design. Normally R101 is
0Ω, C101 and C102 are not mounted. The RF connector is used for conduction test. If the space between RF pin
and antenna is not enough, the matching circuit should be designed as in the following figure:
R101
GSM_ANT
C101
C102
GND
(Pin41)
GND
(Pin39)
GSM
Antenna
Module
D101
Figure 47: GSM simple antenna matching circuit
Normally R101 is 0Ω, C101 and C102 are not mounted.
D101 in Figure 46 and Figure 47 is used for ESD to protect antenna. In order to avoid damaging the module,
TVS can be used. The TVS suggested can refer to Table 35.
Table 35: Recommended transient voltage suppressor
Vendor
Part number
Packages
1
Marata
LXES03AAA1-154
0201
2
Marata
LXES15AAA1-153
0402
4.19.2.
Bluetooth Antenna Interface
The SIM800H module provides a Bluetooth antenna pad named BT_ANT.
The external antenna must be matched properly to achieve best performance, so the matching circuit is necessary,
the connection is recommended as in the following figure:
R201
BT_ANT
(Pin36)
C201
C202
GND
(Pin37)
GND
(Pin35)
BT
Antenna
Module
Figure 48: Bluetooth antenna matching circuit
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