Modified Wilkinson Power Dividers for Millimeter-Wave Integrated Circuits

Abstract—A modification of the Wilkinson power divider is presented that eases planar implementation while maintaining performance. By adding transmission lines between the resistor and the quarter-wave transformers of the traditional design, a range of valid solutions exists that meet the conditions of being reciprocal, isolated between the output ports, and matched at all ports. The proposed design is particularly useful at millimeter-wave frequencies where reduced physical dimensions make a circuit configuration suitable for low-cost package-level implementation difficult using traditional methods. Two frequency bands are demonstrated. At-band, the circuit gives 0.3-dB excess insertion loss, 19-dB isolation, and 50 % bandwidth. At the-band, the circuit gives 0.75-dB excess insertion loss, 24-dB isolation, and 39 % bandwidth. Index Terms—Balun, hybrid, millimeter-wave circuits, power divider, Wilkinson power divider. I