Frequency Reconfigurable 3 dB Wilkinson Power Divider Based on Nematic Liquid Crystal Material

In this paper, a liquid crystal (LC) based reconfigurable 3 dB Wilkinson power divider is presented. GT3-23001 liquid crystal was used as the tuning substrate for the inverted microstrip line configuration. The dielectric constant of the utilized liquid crystal can change from 2.46 to 3.3 when a saturated bias voltage is applied, which leads to a continuous shift of the central resonance frequency from 4.85 GHz to 4.39 GHz, corresponding to a tuning range of 9.48%. Within the operating bandwidth, the return loss is lower than -25 dB, the insertion loss is better than 3.5 dB, and the isolation reaches 25 dB.