A Stub-Based Design for Wideband Unequal Filtering Power Divider with Transmission Zeros and Arbitrary Phase Difference

In this letter, a wideband unequal filtering power divider (UFPD) with two transmission zeros (TZs) and the arbitrary phase difference is proposed. The phase difference can be adjusted arbitrarily by changing the delay parameter,
$\boldsymbol{\theta}_{\boldsymbol{delay}}$
. For verification, a UFPD with a power ratio of 2:1 is designed, simulated, and fabricated. The measured results demonstrate that the phase difference in the passband is
$\mathbf{42.5}^{\circ}\pm \mathbf{2.5}^{\circ}$
. Additionally, the isolation is better than 15 dB while the return loss is better than 18 dB.