A High Frequency/Power Ratio Wilkinson Power Divider Based on Identical/Non-identical Multi-T-sections with Short-circuited Stubs

In this article, a systematic procedure is presented for the design of a dual-band unequal-split Wilkinson power divider (WPD) with high frequency and power division ratios. The design methodology is based on replacing the impractical high-impedance transmission line in the conventional divider with cascaded T-section structures with short-circuited stubs. The proposed methodology is simple and adopts distributed elements without reactive components to achieve a large power division ratio. The use of short-circuited stubs allows for circuit miniaturization in comparison to counterpart open-stub techniques. Furthermore, a high frequency ratio is obtained through optimizing the electrical and physical parameters of the T-sections based on a transmission lines theory framework as demonstrated in a simulated and measured prototype. To validate the proposed procedure, two WPD prototypes operating at 1/2.7 GHz and 1/4.4 GHz with a 1:10 power division ratio are simulated and measured. The theoretical response, supported by electromagnetic simulations and measurements, justifies the design concept.