Design of miniaturized microstrip Wilkinson power divider based on artificial transmission lines

In this paper, a novel microstrip Wilkinson power divider based on artificial transmission lines is proposed. The design consists of recently proposed artificial transmission lines using L-C components instead of conventional microstrip transmission lines. Two interdigital capacitors and a chip resistor were applied to improve output port isolation. A power divider at 915 MHz was designed and fabricated. Compared with conventional Wilkinson power dividers, it features a size reduction of 75%. The bandwidth of the power divider is from 0.49 GHz to 1.2 GHz, the insertion loss is less than 3.2 dB, and the return loss is greater than 10.0 dB. Furthermore, the amplitude balance is within 0.2 dB and the phase balance is better than 1° in its operating band. Measured results show good consistent