A Miniaturized Balanced-to-Balanced Power Divider With Common-Mode Noise Absorption

In this article, a miniaturized balanced-to-balanced (B-B) power divider (PD) has been introduced. The design of the proposed PD is to separate a typical absorptive B-B PD into three stages, input common-mode (CM) matching stage, power dividing stage, and output CM matching stage. By codesigning and combining the three stages, the circuit size is adjustable and absorptive B-B PDs can be realized in a compact size. Based on the proposed approach, an absorptive B-B PD is realized on a two-layered printed circuit board (PCB) structure. The circuit size of the proposed absorptive B-B PD is
$0.43\lambda \text{g}^{2}$
, which is the most compact one among existing two-layered absorptive B-B PDs. The simulated results agree well with the measured ones. The measured results at 2.45 GHz show that reflection and transmission for CM operation are all less than −15 dB and less than −15 dB and better than −3.3 dB for differential-mode (DM) operation.