Design of a Dual-Band Three-Way Power Divider with Unequally High Power Split Ratio

In this paper, a dual-band three-way power di-vider with unequally high power split ratio is proposed. The dual-band operation is achieved by using a two-section impedance transformer, and to reach a high split ratio, transmission lines with impractical high characteris-tic impedances are replaced with dual-band T-shaped structures. The design is conducted with a thorough analy-sis and systematic design procedure for facilitating the rapid development of the prototypes. To verify the effec-tiveness of the proposed design method, an example of a power divider with a power split ratio of 7: 5: 1 is inves-tigated, fabricated, and measured on a Rogers RO4003C substrate. Good agreements between the simulation and measurement results are obtained. Compared with several three-way unequal dual-band power dividers in previous works of the others, our proposed power divider delivered high power split ratio while still retaining good perfor-mances of insertion loss, return loss, and isolation between output ports. © 2023, Radioengineering. All Rights Reserved.