A balanced-to-balanced power divider with common-mode noise absorption

This paper presents a balanced-to-balanced power divider (PD) with common-mode (CM) noise absorption for the first time. By properly adding the λ/4 transformers and resistors at the input-/output ports of back-to-back PD, the proposed balanced-to-balanced PD can achieve CM noise absorption while keeping its differential-mode (DM) characteristics. The measured results at 2.55 GHz show that reflection and transmission coefficients for CM operation are all less than -30 dB, while less than -30 dB and better than -4 dB for DM operation.