A general design for multi-output ports planar Wilkinson power divider

A general design for a microstrip-fed multi-output port planar Wilkinson power divider is proposed, designed and fabricated for industrial, scientific and medical radio band applications. The realized design operates in a wideband frequency range from 1.77 to 2.88 GHz with a low insertion loss imbalance below 0.01 dB at 2.4 GHz. The power divider adopts a 2-layered structure and microstrip feeding, thus solving the isolation resistor interconnection crossover problem for dividers with more than 2 output ports. A 1-section quarter wave transformer is employed on the upper layer and the second layer is used to interconnect isolation resistors between the output ports. Two different permittivity substrates are chosen to simplify the designed structure. A prototype of a 1-5 ports power divider has been selected as a design example and fabricated. The measured scattering parameters agree well with simulation, which validates the design.