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2020-01-05

Ultra-Wideband Mitigation of Differential to Common Mode Conversion for Bended Differential Lines by Periodic Interdigital Structure

By Hao-Ran Zhu, Fan Li, and Yufa Sun
Progress In Electromagnetics Research Letters, Vol. 89, 7-12, 2020
doi:10.2528/PIERL19092301

Abstract

In this paper, a periodic interdigital structure for wideband mitigation of differential-to-common mode conversion at the bend discontinuity of differential lines is proposed. A hybrid inductance and capacitance compensation property is exhibited to suppress the common-mode noise of asymmetric transmission lines. An equivalent circuit model is given to explain the working principle of the presented periodic interdigital structure for differential pairs. In comparison with the traditional methods, steep and wideband suppression performances are both observed with the proposed design. Moreover, no additional area is required at the bend discontinuity for compensation. From the measured result, the differential-to-common mode conversion of the differential signals can be mitigated from DC to 10 GHz with a rejection level of -20 dB. The measurements agree well with the simulation predictions.

Citation


Hao-Ran Zhu, Fan Li, and Yufa Sun, "Ultra-Wideband Mitigation of Differential to Common Mode Conversion for Bended Differential Lines by Periodic Interdigital Structure," Progress In Electromagnetics Research Letters, Vol. 89, 7-12, 2020.
doi:10.2528/PIERL19092301
http://jpier.org/PIERL/pier.php?paper=19092301

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