Product Info
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- Introduction
- Product Concept
- Application Interfaces
- GNSS Receiver
- Antenna Interfaces
- Electrical, Reliability and RadioCharacteristics
- Mechanical Dimensions
- Storage, Manufacturing and Packaging
- Appendix A References
LTE Module Series
EG61-NA Hardware Design
EG61-NA_Hardware_Design 55 / 77
LTE FDD B5 824~849 869~894 MHz
LTE FDD B12 699~716 729~746 MHz
LTE FDD B13 777~787 746~756 MHz
LTE-FDDB66 1710~1780 2100~2200 MHz
LTE-FDD B71 663~698 617~652 MHz
5.1.3. Reference Design of RF Antenna Interface
Areference design of ANT_MAIN and ANT_DIVantenna pads is shown as below. Aπ-type matching circuit
should be reserved for better RF performance. The capacitors are not mounted by default.
ANT_MAIN
R1 0R
C1
Module
Main
antenna
NM
C2
NM
R2 0R
C3
Diversity
antenna
NM
C4
NM
ANT_DIV
Figure 30: Reference Circuit of RF Antenna Interface
1. Keep a proper distance between the main antenna and theRx-diversityantenna to improve the
receiving sensitivity.
2. ANT_DIV function is enabledby default.AT+QCFG="diversity",0command can be used to disable
receive diversity.
3. Place the π-type matching components (R1/C1/C2, R2/C3/C4) as close to the antenna as possible.
5.1.4. Reference Design of RF Layout
For user’s PCB, the characteristic impedance of all RF traces should be controlled as 50Ω. The
NOTES