A 5.8-GHz reconfigurable power divider for wireless power transfer

A Wilkinson-type reconfigurable power divider using varactor diodes has been designed and fabricated at 5.8 GHz. To vary the power-dividing ratio, T-type impedance transformers including varactor diodes were used instead of quarter-wavelength impedance transformers. In addition, a slight adjustment was applied to improve the return loss characteristics. The fabricated power divider exhibited a variation in the power-dividing ratio from −3.5 dB to 3.5 dB with an insertion loss of less than 2.1 dB, return losses of more than 11.0 dB, and an isolation of more than 14.8 dB at 5.8 GHz.