Instruction Manual
Table Of Contents
- Table of Contents
- 1. Introduction
- 2. Radio Board Connector
- 3. Radio Board Block Summary
- 4. RF Section
- 5. Mechanical Details
- 6. EMC Compliance
- 7. RF Performance
- 8. EMC Compliance Recommendations
- 9. Board Revision History
- 10. Errata
- 11. Document Revision History
4.4 Inverted-F Antenna
The BRD4186C Radio Board includes an on-board, printed inverted-F antenna, tuned for the 2.4 GHz band. Due to the design restric-
tions of the radio board, the input of the antenna and the output of the matching network can't be placed directly next to each other.
Therefore, a 50 Ohm transmission line was necessary to connect them.
The resulting impedance that is presented to the matching network output is shown in the following figure. During the measurement, the
BRD4186C Radio Board was attached to a Wireless Starter Kit Mainboard.
As shown in the figure, the antenna impedace (blue curve) is close to 50 Ohm in the entire 2.4 GHz band, and the reflection (red curve)
is under -10 dB.
Figure 4.2. Impedance and Reflection of the Inverted-F Antenna of the BRD4186C Board Measured from the Matching Output
BRD4186C Reference Manual
RF Section
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