Designs of dual-band Wilkinson power dividers with flexible frequency ratios

This paper presents new designs of Wilkinson power dividers for dual-band operations. Two types of dual-band quarter-wavelength (λ/4) transmission lines are proposed first, where both open- and short-ended stubs are applied. ABCD-matrix is then employed to derive the design equations of these dual-band lines. Based on these equations, it is found that the proposed structures feature a large frequency ratio range (from 2.16 to 4.9). By replacing the conventional λ/4-line with these dual-band lines, the desired dual-band Wilkinson power dividers can be realized. A power divider working at 1.8 / 5.8 GHz is designed using this method. Its measured performance verifies the design concepts.