Compact single-layer in-phase power divider employing microstrip to slotline transitions

The design of an ultra-wideband in-phase power divider for head imaging is presented. The proposed divider employs broadside coupling via a single layer microstrip/slot configuration. It has a compact size with an overall dimension of 30 mm × 30 mm. The proposed design is suitable for single layer integration as both the input and the output ports are located at the same layer. A resistor is also used to enhance the isolation between the output ports of the device. The simulated results of the proposed divider show equal power division with less than 0.5 dB additional insertion loss, more than 15 dB isolation and more than 10 dB return loss over the band 2.5- 4.5 GHz.