Antenna Design Requirements; Rf Connector Recommendation - Quectel EC21 Series Hardware Design

4.4. Antenna Design Requirements

The following table shows the requirements on main antenna, Rx-diversity antenna and GNSS antenna.
Table 41: Antenna Requirements
Type
GNSS 9
GSM/WCDMA/LTE
NOTE
When the module supports LTE B13 or B14, it is recommended to use passive GNSS antennas, since
active antennas may cause harmonics that affect GNSS performance.

4.5. RF Connector Recommendation

If RF connector is used for antenna connection, it is recommended to use U.FL-R-SMT connector
provided by Hirose.
9 It is recommended to use a passive GNSS antenna when LTE B13 or B14 is supported, as the use of active antenna
may generate harmonics which will affect the GNSS performance.
EC21_Series_Hardware_Design
Requirements
Frequency range: 1559–1609 MHz
Polarization: RHCP or linear
VSWR: < 2 (Typ.)
Passive antenna gain: > 0 dBi
Active antenna noise figure: < 1.5 dB
Active antenna gain: > 0 dBi
Active antenna embedded LNA gain: < 17 dB
VSWR: ≤ 2
Efficiency: > 30 %
Max input power: 50 W
Input impedance: 50 Ω
Cable insertion loss:
< 1 dB: LB (<1 GHz)
< 1.5 dB: MB (1–2.3 GHz)
< 2 dB: HB (> 2.3 GHz)
LTE Standard Module Series
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