A New Broadband High Directivity 3dB-Hybrid and Power Divider

This paper shows an analytic way of synthesizing the 2-way Wilkinson power divider without any CAD optimization. The bandwidth in the new design is increased by increasing the number of quarter-wave transformer in the even and odd mode equivalent circuits. Only one isolating resistance is used independent of bandwidth. The new power divider is converted into a 180°/90° 3dB-hybrid with 4 output ports. This 4-port component has a high directivity independent of frequency when used as a 180° 3dB-hybrid. Experimental results are given for a 2-way divider and a 3dB-hybrid built in microstrip with the center frequency 5 GHz.