Design of A Microstrip Filtering Power Divider With A Wide Passband and Broad Stopband

A compact and planar power divider with a wide passband and broad stopband is proposed. By using the coupled transmission lines for two output ports, the slope around the passband skirt will increase and the passband's bandwidth can be extended. Moreover, by inserting the open stubs at the input port and between two coupled transmission lines, a wide stopband can be obtained. An exemplary design of the power divider operated at 2 GHz is proposed. This power divider is fabricated on Rogers RO4003C with the size of 0.53 lambda(g) x 0.52 lambda(g). Moreover, the measured fractional bandwidths in the passband and stopband are greater than 52.5% and 57.1%, respectively.