An Optimization Algorithm in Ultrawideband Bandpass Wilkinson Power Divider for Controllable Equal-Ripple Level

In this letter, an ultrawideband (UWB) bandpass Wilkinson power divider (WPD) is introduced. By using filter synthesis theory and proposed optimization algorithm, all the <inline-formula> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula>-parameters (<inline-formula> <tex-math notation="LaTeX">$S_{11}$ </tex-math></inline-formula>, <inline-formula> <tex-math notation="LaTeX">$S_{21} = {S} _{31}$ </tex-math></inline-formula>, <inline-formula> <tex-math notation="LaTeX">$S_{22} = {S} _{33}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$S_{32}$ </tex-math></inline-formula>) of the proposed topology could provide an equal-ripple response, and their equal-ripple level and bandwidth can be controlled, respectively. For verification purposes, a prototype UWB WPD has been simulated, fabricated, and measured. The measured and simulated results are matched reasonably well.

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