Modified gysel power divider for hyperthermia using microstrip to slotline transitions

An in-phase power divider with high power handling capability is presented. The proposed design is a modified structure of the traditional Gysel design. The modification includes using microstrip to slotline transitions to connect the input port to the two output ports with the aim to match the ports across wide band. As with the conventional design, the device uses an external isolation resistor, and thus it is suitable for high power microwave based applications. The proposed structure provides 53% fractional bandwidth (1.5-2.6 GHz) based on 15 dB of isolation as the reference. The simulated results show equal power division with 1 dB additional insertion loss, more than 15 dB of return loss at the input, 10 dB at the output ports, and 15 dB isolation while maintaining less than 10° phase imbalance between the output ports.