User's Manual
Table Of Contents
- 1 Introduction
- 2 Disclaimer
- 3 Overview
- 4 Functional description
- 5 PCB layout description
- 6 Mechanical description
- 7 Electrical characteristics
- 8 Abbreviations
- References
- EVALUATION BOARD/KIT IMPORTANT NOTICE
- 9 Table of contents
22
Atmel AVR2092
8427A-AVR-10/11
Figure 5-13. Antenna without tuning elements.
The first tuning step will use the series capacitor to tune the band center down to a
pure resistive behavior. The band center is crossing the 30 degree (1/3 x Z
0
) line.
Therefore, the tuning capacitor can be determined by:
fXc
C
π
2
1
=
with
OhmXc 50*
3
1
=
f = 2.450GHz
We get a capacitance of 3.89pF, and can simply use a 3.9pF value. The result of this
tuning step can be seen in Figure 5-14, page 23.