Compact Tunable Wilkinson Power Divider with Simple Structure

In this paper, a compact tunable Wilkinson power divider is presented with a simple structure. T-type structure replaced a quarter-wave transmission line for compact circuit and tunable function, where T-type structure only includes three varactors and one stub. Design parameters are newly derived from even- and odd-mode analysis. Both characteristic impedance and its electrical length of the stubs could determine a tuning frequency range independently. Therefore, by selecting these two different parameters, various tuning frequency ranges can be realized. One experimental circuit was fabricated, and measured results show a good tuning range with good Wilkinson power divider performance.