2.4G PCB天线设计.pdfVIP

Freescale Semiconductor AN2731 Application Note Rev. 1.2, 11/2004 Compact Integrated Antennas Designs and Applications for the MC13191/92/93 1 Introduction Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Good antenna design is the most critical factor in 2 Antenna Terms . . . . . . . . . . . . . . . . . . . . . . . . 2 obtaining good range and stable throughput in a wireless 3 Basic Antenna Theory . . . . . . . . . . . . . . . . . . 2 application. This is especially true in low power and 4 Impedance Matching . . . . . . . . . . . . . . . . . . . 6 compact designs, where antenna space is less than 5 Miniaturization Trade-offs . . . . . . . . . . . . . . 13 optimal. However, several compact, cost efficient, and 6 Potential Issues . . . . . . . . . . . . . . . . . . . . . . 14 very effective options exist for implementing integrated 7 Recommended Antenna Designs . . . . . . . . 14 antennas. 8 Design Examples . . . . . . . . . . . . . . . . . . . . . 16 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. © Freescale Semiconductor, Inc., 2004. All