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IEEE Session Congress (SC2014) in Amsterdam, Netherlands, at the Rai Convention Center, from 22 to 24 August 2014.

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Date: Tuesday, October 14, 2014

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Location: Agilent Technologies


Gigahertz Two-Band Common-Mode Filters for 10-Gbit/s Differential Signal Lines


Miroslav Pajovic


In addition to the desired differential signals, the undesired and EMI harmful common-mode noise may propagate along differential signal lines. Conventional common-mode filters such as ferrite chokes - which work well in lower frequencies below 1 GHz – have limited effectiveness in the gigahertz frequency range. To suppress critical common-mode at gigahertz frequencies without degrading quality of the differential signals, the gigahertz common-mode filter structure is proposed herein. This design is directed to a compact-size electromagnetic band gap (EBG) structure suitable for placement in multilayer PCBs, individual IC chip packages, or in optical transceiver modules. The filter provides common-mode suppression at 10-Gbit/s differential signal lines at the frequencies 10.3125 GHz and 20.625 GHz, where common-mode noise can be highly problematic.


Miroslav Pajovic

Miroslav is currently an EMC Design and RF/Antenna consulting engineer. Previously, he was an EMC technical lead, designer and researcher in Cisco Systems, San Jose, CA; Senior EMI/RF engineer in Nortel Networks, Santa Clara, CA; and Principle RF System Engineer in several HF/RF Centers in Washington DC, USA and Yugoslavia. He holds Diploma Degree in Electrical and RF Engineering (equivalent to M.S. degree) from Belgrade University, Serbia, Yugoslavia. He is an author of several IEEE EMC Transactions papers published in 2007, 2008, 2010, and IEEE EMC International Symposium paper, 2013. Also, he filed USA patents in 2011 and 2012. Currently, he is focusing on R&D of Metamaterial antennas and related microwave circuits for EMC and RF/Microwave applications. .