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This study constructs stepped-impedance coupled-lines for a dual-band coupler design over a frequency ratio range of 1.8-3.0. The proposed structure demonstrates good dual-band performance and compact size due to the centric arrangement of the excitation ports, which allows a more space-efficient circuit configuration. The developed synthesis method utilizes stepped impedance coupled-line to achieve...
A novel 180?? hybrid is proposed. This hybrid is derived from the Wilkinson divider, where the resistor is simply replaced by a fourth port of equal characteristic impedance, which acts as the ?? port of the hybrid, while the input port of the original Wilkinson divider acts as the ?? port. Due to this structure, including only two quarter-wavelength transmission lines, this hybrid has a greatly reduced...
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