VHF/UHF broadband four-way power combiner/divider using 0° hybrid and impedance transformer based on transmission lines

摘要

This study presents a broadband four-way power combiner/divider for very high frequency (VHF) to ultra-high frequency (UHF) bands using 0 hybrids and impedance transformers based on transmission lines. The 0 hybrids were used as in-phase power combiners or dividers, and 1 : 4 impedance transformers were adopted to transform the impedance so that all input and output ports had a 50 Ω impedance. Each component was analysed using equivalent circuits. The overall size of the implemented four-way power combiner/divider module was 110 × 163 mm. Based on the measured S-parameters, an ultrabroad bandwidth from 8.0 to 600 MHz was achieved with an insertion loss <;1.0 dB, reflection coefficients below -10.0 dB, isolation among the ports less than -15.0 dB, and magnitude and phase imbalances less than ±0.1 dB and 0.5, respectively.