PCB antenna theory

Pcb Antenna TheoryFreescale Semiconductor Application Note

AN2731 Rev. 1.2, 11/2004

Compact Integrated Antennas
Designs and Applications for the MC13191/92/93

1

Introduction

Contents
1 2 3 4 5 6 7 8 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Antenna Terms . . . . . . . . . . . . . . . . . . . . . . . . 2 Basic Antenna Theory . . . . . . . . . . . . . . . . . . 2 Impedance Matching . . . . . . . . . . . . . . . . . . . 6 Miniaturization Trade-offs . . . . . . . . . . . . . . 13 Potential Issues . . . . . . . . . . . . . . . . . . . . . . 14 Recommended Antenna Designs . . . . . . . . 14 Design Examples . . . . . . . . . . . . . . . . . . . . . 16

Good antenna design is the most critical factor in obtaining good range and stable throughput in a wireless application. This is espec