Chapter 3. Impedance Matching

  1. W. Alan Davis PhD1 and
  2. Krishna K. Agarwal PhD2

Published Online: 9 OCT 2001

DOI: 10.1002/0471200689.ch3

Radio Frequency Circuit Design

Radio Frequency Circuit Design

How to Cite

Davis, W. A. and Agarwal, K. K. (2001) Impedance Matching, in Radio Frequency Circuit Design, John Wiley & Sons, Inc., New York, USA. doi: 10.1002/0471200689.ch3

Author Information

  1. 1

    University of Texas at Arlington

  2. 2

    Raytheon Systems Company

Publication History

  1. Published Online: 9 OCT 2001

Book Series:

  1. Wiley Series in Microwave and Optical Engineering

Book Series Editors:

  1. Kai Chang

Series Editor Information

  1. Texas A&M University

ISBN Information

Print ISBN: 9780471350521

Online ISBN: 9780471200680



  • impedance matching;
  • Q factor;
  • resonance;
  • bandwidth;
  • unloaded Q;
  • circuit;
  • transformation circuit;
  • tapped capacitor transformer;
  • parallel double-tuned transformer;
  • problems


A major part of RF design is matching one part of a circuit to another to provide maximum power transfer between the two parts. Even antenna design can be thought of as matching free space to a transmitter or receiver. This chapter describes a few techniques that can be used to match between two real impedance levels. Although some comments will be made relative to matching to a complex load, the emphasis will be on real impedance matching. This chapter discusses the circuit quality factor, Q. The Q factor will be used with some of the subsequent matching circuit designs. Also discussed are L circuit impedance, transformation circuits, tapped capacitor transformer, and parallel double-tuned transformer.