Design of Wilkinson power divider with embedded low-pass filter and cross-stub for improved stop-band characteristics

This paper presents a modified microstrip Wilkinson power divider with improved stopband characteristics. By using embedded stepped-impedance low-pass filters and a cross-stub, not only wide stopband performance but also a controllable transmission zero for specified nth harmonic suppression can be effectively obtained. In addition, the explicit design equations of the proposed power divider are derived. Several power divider examples centered at 1.5 GHz are designed, fabricated and measured for demonstration. Experimental results show a good agreement with the simulated ones, which validates the proposed design.