A Compact Bandpass Wilkinson Power Divider With Ultra-Wide Band Harmonic Suppression

A Wilkinson power divider (WPD) with bandpass property and an ultra-wide band harmonic suppression is proposed in this letter. The frequency-selecting coupling structure is embedded to the conventional quarter-wavelength transmission line, which can realize an ultra-wide harmonic suppression with three transmission zeros. Short-ended meander line stubs are shunted at the both output ports for dc block and provide an extra transmission zero for the passband. The proposed WPD operates with a -20 dB bandwidth from 1.74 to 3.71 GHz with an ultra-wide stopband to suppress the dc, 3 f
₀
, 5 f
₀
, and 7 f
₀
harmonic components. The proposed WPD has a compact size of 14.65 mm × 19.64 mm (0.19λ
_g
× 0.25λ
_g
).