UHF PPL dipole 410-470 MHz

Authors: Makarov, Boisse

Abstract

In this study, a simple analytical transmission line model of a split-coaxial balun is proposed and tested. It is based on the coupled symmetric transmission line approach. The model leads to a closed-form analytical expression for the termination impedance/transfer function of the complete antenna system that includes a dipole, balun, and a non-splitted coaxial line of certain length. It accepts the impedance of a center-fed dipole as input parameter. The model is in excellent agreement with full wave simulations and enables us to optimize the impedance bandwidth of the dipole antenna. The model predicts a 12% 10 dB return loss bandwidth for the resonant dipole-balun configuration and a greater than 20% bandwidth for the combined dipole, balun and non-splitted line configuration.  Finally, the model is confirmed by prototype measurements.  

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