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5.1.3 RF Matching Bill of Materials
The BRD4108A RF matching network bill of materials is shown in the following table.
Component name
L1
L2
CC1
C3
C4
C5
5.1.4 Antenna
The BRD4108A has an on-board ceramic antenna.
The land pattern for the antenna on the PCB layout was designed based on the recommendations of the antenna data sheet. Because
there is a significant difference between the layout (practically the board size) of the BRD4108A and the antenna evaluation board, the
applied antenna matching network deviates from the recommendation.
The values of the antenna matching network components were fine-tuned to match the antenna impedance close to 50 Ohm on the
BRD4108A PCB. The resulting antenna impedance and reflection are shown in the figure below.
Figure 5.2. Fine-tuned Antenna Impedance (Blue Curve) and Reflection (Red Curve)
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Table 5.1. BRD4108A RF Matching Network Bill of Materials
Value
Manufacturer
2.7 nH
Murata
3 nH
Murata
18 pF
Murata
0.1 pF
Murata
1.2 pF
Murata
NM
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UG509: BG22 Explorer Kit User's Guide
Part Number
LQP03HQ2N7B02
LQP03HQ3N0B02
GJM0335C1E180GB01D
GRM0335C1H0R1WA01D
GRM0335C1H1R2BA01D
–
Radio
Rev. 1.1 | 16
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