Short course 1 (half-day)
Balun Designs for RF and Microwave Applications
Presented by Prof. Johannes Cloete, Department of Electrical & Electronic Engineering, University of Stellenbosch
A wide selection of important physical topologies is presented with emphasis on baluns for antennas. Many of the topologies are also useful in amplifiers and oscillators.
The balun equivalent circuits are developed to exhibit fundamental principles – such as symmetry and shielding – which underpin the balance to unbalance transition and isolation mechanisms. Design methodologies are presented to meet balance, impedance matching and efficiency bandwidth specifications.
Physical examples are exhibited of baluns for resonant antennas such as the circularly polarized turnstile; multi-octave bandwidth LPD and sinuous antennas; and frequency independent equiangular and Archimedes spiral antennas with absorbing cavities.
A complete list of key references for all the topologies is given, including some which are obscure or forgotten in the modern literature.