Miniaturized Balanced-to-Unbalanced Bagley Power Divider with Wideband Common-Mode Suppression

A novel miniaturized balanced-to-unbalanced (BTU) Bagley power divider with wideband common-mode (CM) suppression is proposed in this paper. The quarter-wavelength transformer can be replaced with a equivalent stub-loaded transmission line to realize the miniaturization effectively. Excellent wideband CM suppression can be achieved by using double-sided parallel-strip line 180° phase inverting structure. The operating frequency of the fabricated BTU Bagley power divider is located at 1.0 GHz with a miniaturized circuit size and the 6-dB fractional bandwidth is 70% from 0.5 GHz to 1.2 GHz. Furthermore, the CM suppression is better than 20 dB from 0.5 GHz to 1.5 GHz.