Design of a Novel Balanced-to-Balanced Dual-Band Diplexing Power Divider

In this brief, a balanced-to-balanced (BTB) dual-band diplexing power divider (DBDPD) implemented on a new asymmetric series T-junction MS transition is proposed. Firstly, a four-way BTB power divider (PD) as feed network was designed. The T-junction microstrip-slotline (MS) transitions are employed to realize phase shift and power division within a wide bandwidth. The balanced U-type MS transitions are adopted at each balanced port, which can realize superior common-mode (CM) suppression intrinsically while the differential-mode (DM) responses are independent. Then, the BTB DBDPD is realized by adding four pairs of step impedance resonators (SIRs) asymmetrically to the series T-junction. As a result, an asymmetric series T-junction MS transition with diplexing function is formed, which can flexibly adjust the operating passbands and adapt to the balanced port. Meanwhile, SIRs are employed to realize four sharp passbands. So as to verify the feasibility of the theoretical design, the proposed designs are manufactured. A good agreement can be observed between the simulation and measurement.