TYBT4L V1.0.0
UserManual
Version1.0.0
6
Radio standard
BLE 4.2
Data transmitting
rate
1 Mbit/s
Antenna type
Onboard PCB antenna
4.2 RF Output Power
Table 4.2 TX power during constant emission
PARAMETERS
MIN
TYPICA
L
MA
X
UNI
T
RF output power
-
4.73
-
dBm
6
dB modulation signal bandwidth (1 M)
-
709
-
KHz
4.3 RF RX Sensitivity
Table 4.3 RX sensitivity
Parameter
Min
Typ
Max
Unit
RX sensitivity
1Mbit/s
-93
-92
-90
dBm
Frequency offset error
1Mbit/s
-300
-
+300
KHz
Co-channel interference suppression
-
-
-7
-
dB
5.Antenna Information
5.1 Antenna Types
TYBT4L
has an on-board PCB antenna for BLE
.
5.2 Antenna Interference Reduction
To ensure optimal RF performance, it is recommended that there be a space of at least 15
mm between the module antenna and other metal parts. TYBT4L is attached to the PCB with
other components using the SMT. In this case, the routing position and method of the PCB
antenna directly affect the RF performance. The following figures show the recommended and not
recommended routing positions.
As shown in Figure 5.1, if most of the antenna is outside the PCB frame, solutions 1 and
2 are recommended. The antenna is placed outside the PCB frame or the PCB is carved to reserve
an area for the antenna. By using these two solutions, the performance of TYBT4L is almost the
same as that of the module when being tested independently. If the antenna must be routed on the
PCB due to restrictions, solution 3 is recommended.
The antenna is placed inside the PCB frame and no copper or wire is routed near the
antenna. If this solution is used, the performance is reduced by about 1–2 dBm. It is not
recommended that solution 4 be used, in which the antenna is placed inside the PCB and copper
and other wires are routed under the antenna. In this solution, the RF signal has significantly
attenuation.