Smart LTE Module Series
SC650T Hardware Design
SC650T_Hardware_Design 93 / 131
still requires stable and clean power supplies. It is recommended to use high performance LDO as the
power supply. A reference design of GNSS active antenna is shown below.
Active Antenna
3V3
Module
ANT_GNSS
56nH
10R
1uF
100pF
NM
NM
C4
C1
R1
L1
R2
0R
C5
C3
C2
100pF
Figure 40: Reference Circuit Design for GNSS Active Antenna
6.4. Antenna Installation
6.4.1. Antenna Requirements
The following table shows the requirements on main antenna, Rx-diversity, Wi-Fi/BT antenna and GNSS
antenna.
Table 40: Antenna Requirements
Antenna Type
Requirements
LTE
VSWR: ≤ 2
Gain (dBi): 1
Max Input Power (W): 50
Input Impedance (
Ω): 50
Polarization Type: Vertical
Cable Insertion Loss: < 1dB
(LTE B5/B12/B13/B14/B20/B26/B28)
Cable Insertion Loss: < 1.5dB
(LTE B1/B2/B3/B4/B25/B66)
Cable Insertion Loss: < 2dB (LTE B7)
Wi-Fi/BT
VSWR:
≤ 2
Gain (dBi): 1
Max Input Power (W): 50
Input Impedance (
Ω): 50
Polarization Type: Vertical
Cable Insertion Loss: < 1dB