Parts List/Tune Up Info

XXI-Lab
NETATMO –– Antenna Expertise – ZED US product
Antenna matching and measurement report
Document reference
Date
Version
Page
Exp-NETATMO_Match_ZED-US_20-11-2020
20/11/2020
1.0
6
2.2 Radiated measurements
The measurements were carried out for the E1, E2 and H planes at 2405, 2442 & 2480MHz frequency in vertical
and horizontal polarization with a step of 1 °. From these results the total polarization was calculated.
Measurements have been done using the modem of the product tuned at maximum power for two different
product configurations: product with matching circuit used by default – ‘’Ant-3.0nH shunt-1nH serie- 0.5pF
shunt’’ and the proposed matching circuit – ‘’Ant-4.7nH shunt - 2pf serie’’
The H, E1 & E2 planes are displayed below :
figure 5. Photo of the H, E1 & E2 plane
Results are compiled in the table below:
Radiated Power (dBm) / Frequency
/ plane
2405MHz
2440MHz
2480MHz
H
E1
E2
H
E1
E2
H
E1
E2
Default matching network
‘’Ant-3.0nH shu-1nH ser- 0.5pF shu’’
-4.35
+3.15
+8.27
-3.50
+3.56
+8.67
-3.24
+3.67
+8.22
Proposed matching network
‘’Ant-4.7nH shunt - 2pf serie’’
-2.25
+5.43
+10.39
-1.80
+5.3
+10.56
-1.46
+5.66
+10.34
tableau 1. Maximum radiated power for the default and proposed matching network
The proposed matching network allow to gain about 2dB whatever the zigbee frequcency.
Taken into account a power measured at +6.3dBm at the antenna port, then the antenna gain is about +4dBi,
what is very good for such a product.