EMI reducing interdigital slot on reference planes of the PCBs

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dc.authorid0000-0002-3740-2391en_US
dc.authorid0000-0001-9968-5123en_US
dc.contributor.authorSis, Seyit Ahmet
dc.contributor.authorÜstüner, Fatih
dc.contributor.authorDemirel, Ekrem
dc.date.accessioned2022-01-20T07:54:26Z
dc.date.available2022-01-20T07:54:26Z
dc.date.issued2021en_US
dc.departmentFakülteler, Mühendislik Fakültesi, Elektrik-Elektronik Mühendisliği Bölümüen_US
dc.description.abstractIn some very low noise mixed-signal circuits, designers may use intentional slots in order to create a better isolation between a noisy digital ground and a very quiet analog ground, especially in low-frequency applications (<1 MHz) when the current spread in the return plane may interfere with the quiet analog ground. Traces on the signal planes, crossing over these slots, are well-known sources for electromagnetic interference (EMI) due to discontinuities on the return current path. This article presents a novel interdigital slot structure used in the reference planes. The interdigital structure increases the coupling and, hence, provides a low impedance path for the return current of the signal line. This, in return, significantly reduces the radiated emission level in the printed circuit boards (PCBs). Furthermore, due to the periodic nature of transmission lines and the slow-wave effect provided by the interdigital structure, the periodically repeating resonance frequencies of the interdigital defect can be tuned by simply changing the geometric parameters such as digit length and the number of digits. It is shown that the electromagnetic radiation from these slots exhibits peak levels at these antiresonance frequencies, which are also the transmission zeros of the circuit. Conversely, radiation levels are minimized at passbands, where a good signal transmission is achieved. Therefore, this relationship would allow designers to tune the slot length to minimize radiation at the frequency of the signal passing through the trace. Four PCBs with three different-size interdigital structures and a traditional slot structure are first simulated and then fabricated. Well-agreed simulation and measurement results show that the EMI is suppressed by as much as 30 dB within the frequency range of 250MHz–1 GHz. The radiation peaks and dips match with the S21 minima (transmission zeros) and maxima, respectively, in measurement results as well.en_US
dc.identifier.doi10.1109/TEMC.2021.3083654en_US
dc.identifier.endpage11en_US
dc.identifier.scopus2-s2.0-85112633945en_US
dc.identifier.scopusqualityN/Aen_US
dc.identifier.startpage1en_US
dc.identifier.urihttps://hdl.handle.net/11467/5162
dc.identifier.urihttps://doi.org/10.1109/TEMC.2021.3083654
dc.identifier.wosWOS:000732634800001en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherIEEEen_US
dc.relation.ispartofIEEE Transactions on Electromagnetic Compatibilityen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/embargoedAccessen_US
dc.subjectCommon impedance couplingen_US
dc.subjectDefected ground structureen_US
dc.subjectElectromagnetic compatibility (EMC)en_US
dc.subjectElectromagnetic interference (EMI)en_US
dc.subjectInterdigital sloten_US
dc.subjectPrinted circuit board (PCB)en_US
dc.subjectReference planeen_US
dc.subjectReturn path discontinuityen_US
dc.subjectSlow-wave effecten_US
dc.titleEMI reducing interdigital slot on reference planes of the PCBsen_US
dc.typeArticleen_US

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