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发表于 2007-8-8 12:35:54
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Freescale Semiconductor
Application Note
AN2731
Rev. 1.2, 11/2004
Compact Integrated Antennas
Designs and Applications for the MC13191/92/93
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Antenna Terms . . . . . . . . . . . . . . . . . . . . . . . . 2
3 Basic Antenna Theory . . . . . . . . . . . . . . . . . . 2
4 Impedance Matching . . . . . . . . . . . . . . . . . . . 6
5 Miniaturization Trade-offs . . . . . . . . . . . . . . 13
6 Potential Issues . . . . . . . . . . . . . . . . . . . . . . 14
7 Recommended Antenna Designs . . . . . . . . 14
8 Design Examples . . . . . . . . . . . . . . . . . . . . . 16
1 Introduction
Good antenna design is the most critical factor in
obtaining good range and stable throughput in a wireless
application. This is especially true in low power and
compact designs, where antenna space is less than
optimal. However, several compact, cost efficient, and
very effective options exist for implementing integrated
antennas.
To obtain the desired performance, it is required that
users have at least a basic knowledge about how
antennas function, and the design parameters involved.
These parameters include selecting the correct antenna,
antenna tuning, matching, gain/loss, and knowing the
required radiation pattern.
This note will help users understand antenna basics, and
aid in selecting the right antenna solution for their
application.
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