Balanced-to-Balanced and Balanced-to-Unbalanced Power Dividers With Ultra-Wideband Common-Mode Rejection and Absorption Based on Mode-Conversion Approach

In this paper, for the first time, a balanced-to-balanced (B–B) power divider (PD) and a balanced-to-unbalanced (B–UB) PD with ultra-wideband common-mode (CM) rejection and absorption characteristics are introduced based on a new design approach. The design of B–B and B–UB PD structures is using one core circuit to provide power dividing/combining and differential-mode-to-common-mode (DM–CM) converters to realize mode conversion at the balanced ports. With the use of the DM–CM converter, the boundary condition on the symmetric plane of the core circuit is then reversed. Specifically, a perfect-electric wall will be formed along the symmetric plane of the core circuit under the CM operation, with a perfect-magnetic wall under the DM operation. Based on this characteristic, the proposed B–B and B–UB PDs can then achieve wideband CM suppression and absorption with some proper designs. The measured results show that the transmission coefficients of CM operation for the proposed B–B and B–UB PDs are all less than −15 dB with a fractional bandwidth about 200%. In addition, the measured CM absorption rate is higher than 85% with a fractional bandwidth about 71.2% and 116% for the proposed B–B and B–UB PDs, respectively.

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