Design of multi-band miniaturized Bagley power dividers based on non-uniform coplanar waveguide

Abstract

Power dividers, in general, suffer from higher order harmonics and large occupational area, especially at low frequencies. To overcome these drawbacks, we introduce the design of a three-way Bagley power divider (BPD) using non-uniform coplanar waveguide (CPW). The compact configuration is achieved by replacing the conventional CPW with its equivalent non-uniform counterpart. An optimization process incorporating a truncated Fourier series is used to design the optimum non-uniform CPW profiles. Odd harmonics are suppressed by enforcing the divider to operate only at the design frequencies based on a predefined error function. The proposed structure is compact and easy to fabricate. To validate the design approach, different 3-way BPDs (i.e., single-, dual-, and triple-band) are designed and simulated; whereas a single-band prototype is fabricated and tested. Measured results show excellent input port matching and an insertion loss around −5 dB at the design frequency.