A Novel Approach to the Design of Dual-Band Power Divider With Variable Power Dividing Ratio Based on Coupled-Lines

Abstract—This paper presents an approach to the design of a novel dual-band power divider with variable power dividing ratio. To achieve dual-band operation, a novel dual-band quarter-wave length transformer based on coupled-lines is proposed, which is used to replace the quarter-wave length transformer in Wilkinson power divider. The proposed dual-band power divider features a simple compact planar structure with wide bandwidth performance for small frequency ratio. Closed-form design equations with one degree of design freedom are derived using even- and odd-mode analysis and transmission line theory. For verification purpose, power dividers operating at 2.4/3.8GHz with dividing ratios of 2: 1 and 1: 1 are designed, simulated and measured. The simulated and measured results are in good agreement. 1.