Fm Antenna Interface - SimCom SIM800L Hardware Design

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:
Module
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
1 Marata
2 Marata

4.19.2. FM Antenna Interface

The module provides 1 FM antenna pad named FM_ANT . The FM antenna interface circuit is recommended as
following:
Moudle
Normally, R303\R304 are 0Ω, C303\C304 are not mounted.
SIM800L(MT6261)_Hardware Design_V1.01
GND
(Pin39)
GSM_ANT
(Pin40)
GND
(Pin41)
Figure 47: GSM simple antenna matching circuit
Part number
LXES03AAA1-154
LXES15AAA1-153
FM_ANT
C303
Figure 48: FM antenna matching circuit
Smart Machine Smart Decision
R101
C101 C102
Packages
0201
0402
R304
R303
C304
48
GSM
Antenna
D101
FM
Antenna
2016-07-07