Compact CVT-/CCT-Unequal Power Dividers for High-Power Division Ratios and Design Methods for Arbitrary Phase Differences

Compact unequal power dividers are suggested for high-power division ratios and arbitrary phase differences. The power dividers are classified into two parts: power-dividing and impedance-transforming parts and consist of the asymmetric impedance transformers of constant voltage-standing wave ratio (VSWR)-type transmission-line impedance transformers (CVTs) and constant conductance-type transmission-line impedance transformers (CCTs). Given the special properties of asymmetric impedance transformers, the arbitrary phase differences between two outputs may be obtained by controlling the impedance-transforming part. Compactness can be achieved by using the equivalent circuits of stepped-impedance modified T-types and L-S1-types. A power divider with a power division ratio of 9 (9.542 dB) and total transmission line sections that are 181.1 degrees long is fabricated to verify compactness and best frequency performance. Another power divider comprising two CVTs and two different CCTs is measured for 45 degrees phase difference between two outputs. The measured results are in good agreement with the predicted findings.