Product Info

Smart Module Series
SC200R Series Hardware Design
SC200R_Series_Hardware_Design 86 / 125
In order to ensure RF performance and reliability, follow the principles below in RF layout design:
 Use an impedance simulation tool to accurately control the characteristic impedance of RF traces to
50 Ω.
 Design the GND pins adjacent to RF pins as thermal relief pads, and fully connect them to ground.
 Keep the distance between the RF pins and the RF connector as short as possible. Change all the
right-angle traces to curved ones and the recommended trace angle is 135°.
 Reserve clearance under the signal pin of the antenna connector or solder joint.
 Keep the reference ground of RF traces complete. Meanwhile, add some ground vias around RF
traces and the reference ground to improve RF performance. The distance between the ground vias
and RF traces should be no less than two times the width of RF signal traces (2 × W).
 Keep RF traces away from interference sources, and avoid intersection and paralleling between
traces on adjacent layers.
For more details about RF layout, see document [3].
6.5. Antenna Installation
6.5.1. Antenna Requirements
The following table shows the requirement on the main antenna, Rx-diversity antenna, Wi-Fi/BT antenna
and GNSS antenna.
Table 42: Antenna Requirements
Type Requirements
GSM/WCDMA/LTE
VSWR: ≤ 2
Gain: 1 dBi
Max Input Power: 50 W
Input Impedance: 50 Ω
Polarization Type: Vertical
Cable Insertion Loss: < 1 dB
(GSM850, EGSM900, WCDMA B5/B6/B8/B19, EVDO/CDMA BC0,
LTE B5/B8/B12/B13/B14/B17/B18/B19/B20/B26/B28A/B28B/B71)
Cable Insertion Loss: < 1.5 dB
(DCS1800, PCS1900, WCDMA B1/B2/B4, LTE B1/B2/B3/B4/B11/B21/
B25/B34/B39/B66)
Cable Insertion Loss: < 2 dB
(LTE-FDD B7, LTE-TDD B38/B40/B41)
Wi-Fi/BT
VSWR: ≤ 2
Gain: 1 dBi