Appendix 2.1 Measured TX Emission
The measured TX emissions with the 5 x 5 mm 32-pin package 2.4 GHz EFR version at 2.44 GHz are given in the table below. The
tested boards apply a UFL RF connector and a UFL-SMA transition, which together cause approximately 0.5 dB additional attenuation.
So, the real power delivered by the match is approximately 0.5 dB higher.
The TX power does not change much with the different package versions, the variation being lower than 0.5 dB.
Table 2.1. 2.44G TX Results, 5 x 5 mm 32-Pin Single Band Package
Match Type
Fundemental
[dBm]
2nd Harmonic
[dBm]
3rd Harmonic
[dBm]
Cost
Notes
4-element ladder
18.7
–58.7
–66
High
ETSI, FCC Compliant with full power
and large margin
2-element ladder
18.8
–21.4
–42
Low
Second harmonic strongly
violates FCC at high power levels
2-element ladder
@10 dBm
9.7
–42.8
–63.5
Low
Up to 10 dBm ETSI,
FCC compliant
Hybrid LC-Tline-C
19.1
–51.5
–60
Low-Middle
ETSI, FCC Compliant with
full power and large margin
Parallel LC
@13 dBm
13.3
–58.9
–50.4
Very Low
Up to 13 dBm ETSI,
FCC compliant
Power variations across the band are shown in the figure below. The (a), (b), and (c) figures show the ladder four-element match with
the 7x7 mm, 48-pin dual band, 7x7 mm, 48-pin single band, and 5x5 mm, 32-pin single band versions, respectively. The last figure (d)
shows the Tline match variation. In all cases, the variation across the band is less than 0.5 dB. The second and third harmonic varia-
tions are also shown. They are far below the ETSI (~–30 dBm ) and FCC (~–41 dBm ) limits in all cases.
AN930: EFR32 2.4 GHz Matching Guide
2.4 GHz RF Network Schematics and Technical Data
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