The Chapter begins with a discussion of transmission line theory. It describes the mismatch that can occur between two TEM transmission lines which have identical characteristic impedance, but mismatched fields. When examined in terms of distributed circuit analysis, it is clear that a mismatch can occur. Transmission line theory rests on a number of assumptions which are well described by Chipman (1968), and these assumptions are considered next. The Chapter goes on to look at the L-C lattice balun, the coupled microstrip transmission line balun, the microstrip transmission line Marchand balun, and the microstrip branchline (ladder ) balun.

Chapter Contents:

• F.1 Transmission line theory
• F.2 L-C lattice balun
• F.3 Coupled microstrip transmission line balun
• F.4 Microstrip transmission line Marchand balun
• F.5 Microstrip branchline (ladder) balun
• References

Inspec keywords: baluns; transmission lines; antenna accessories; microstrip lines; impedance matching; microstrip antennas

Other keywords: Transmission line theory; characteristic impedance; microstrip branchline balun; coupled microstrip transmission line balun; distributed circuit analysis; TEM transmission lines; microstrip transmission line Marchand balun; microwave transitions; mismatched fields; L-C lattice balun; impedance matching methods; coaxial cable

Subjects: Antenna accessories; Waveguide and microwave transmission line components; Waveguides and microwave transmission lines; Single antennas