Compact/Deep and Wide Harmonic Suppressed Filtering Wilkinson Power Divider

Abstract

This letter presents a filtering Wilkinson power divider (WPD) with good in-band and out-of-band performance based on a filtering impedance inverter (FII). The FII consists of a high-pass filter (HPF) and a low-pass filter (LPF). This FII is capable to produce a required value of phase shift at the designed frequency and matched with any impedance value. To validate this, the quarter wavelength lines of conventional WPD having an impedance of 70.7 Ω are replaced by FII. Therefore, the proposed power divider provides bandpass response and power division simultaneously within a small circuit area. The physical area of the proposed power divider occupies only 30% (0.12λ_g × 0.16λ_g, where λ_g is guided wavelength) circuit area of the conventional WPD. Moreover, the in-band return loss and isolation were better than 30 dB and the out-of-band rejection level was better than −25 dB up to 6.5f₀ obtained.