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Automotive Module Series
AG521R-NA QuecOpen Hardware Design
AG521R-NA_QuecOpen_Hardware_Design 70 / 104
⚫ The distance between the RF pins and the RF connector should be as short as possible, and all the right-angle
traces should be changed to curved ones. The recommended trace angle is 135°.
⚫ There should be clearance under the signal pin of the antenna connector or solder joint.
⚫ The reference ground of RF traces should be complete. Meanwhile, adding some ground vias around RF traces
and the reference ground could help 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 [4].
4.2. Antenna Installation
4.2.1. Antenna Requirements
The following table shows the requirements on the main antenna and the Rx-diversity antenna.
Table 30: Antenna Requirements
Type
Requirements
UMTS/LTE
VSWR: ≤ 2
Efficiency: > 30%
Max input power: 50 W
Input impedance: 50 Ω
Cable insertion loss: < 1 dB
(WCDMA B5/B8/B19, LTE-FDD
B5/B8/B9/B12/B13/B17/B18/B19/B20/B26/B28/B29/B71)
Cable insertion loss: < 1.5 dB
(WCDMA B1/B2/B3/B4B9, LTE-FDD
B1/B2/B3/B4/B9/B11/B21/B25/B32/B66, LTE-TDD B34/B39)
Cable insertion loss: < 2 dB
(LTE-FDD B7/B30, LTE-TDD B38/B40/B41)