RF Electronics Chapter4: Transmission Line Transformers and Hybrids Page 99
2022, C. J. Kikkert, James Cook University, ISBN 978-0-6486803-9-0.
Figure 4.55 Parallel coaxial line Balun. Figure 4.56 Floating coaxial line Balun.
Marchand Balun
Figure 4.57 Original Marchand Balun [16,17].
The Marchand Balun [16-18] as shown in figure 4.57 was developed to allow a transmitter
with a coaxial output to drive dipole antennae. The two balanced signals to the antenna
must have the same amplitude and be 180 out of phase over as wide a bandwidth as
possible. The Marchand Balun includes a basic Balun consisting of coaxial lines Z
oc
and
Z
oe
. The short-circuited transmission line with an impedance Z
ot
improves the phase
difference between the balanced output voltages.
Figure 4.58 Full Marchand Balun.
RF Electronics: Design and Simulation
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