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    EMI reduction in multilayer PCBs using planar interdigital slot structures on the reference planes
    (Institute of Electrical and Electronics Engineers Inc., 2022) Baghel, Lalit Kumar; Sis, Seyit Ahmet; Ustuner, Fatih; Kumar, Suman
    In mixed-signal circuits, the return currents of sensitive analog and noisy digital signals must be carefully isolated in order to protect the integrity of the analog signals. To address this issue, a common approach is to utilize slots on the reference plane between digital and analog circuits. However, the slots so created cause the discontinuity in the return current path for a signal passing over these slots which causes unintentional radiation and results in unwanted electromagnetic interference (EMI). In this regard, we propose the planar interdigital slot structures for use in reference planes of multilayer PCBs in order to provide a low impedance path for return current. The interdigital structure alleviates the return current path discontinuity and hence reduces the unintentional radiation. In addition to this, a relationship between radiated emission and transmission response is obtained, allowing the designer to tune the slot parameters to minimize radiation at the signal frequency. PCBs with different size planar interdigital slot structures are simulated in Ansys HFSS and is found that the longer digit length corresponds to better EMI reduction, especially at higher frequencies.
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    A novel hybrid nested reverberation chamber measurement technique for shielding effectiveness of conductive fabrics
    (Institute of Electrical and Electronics Engineers Inc., 2022) Ozdemir, Hakki Ekin; Nisanci, Muhammet Hilmi; Ustuner, Fatih; Citkaya, Ahmet Yasin; Torpi, Hamid; Mersin, Mucahid Taha; Aba, Ridvan; Cosar, Coskun
    This paper presents a novel hybrid nested reverberation chamber measurement technique for shielding effectiveness measurement of the conductive fabrics. The test setup consists of a conventional outer reverberation chamber and a small inner chamber whose walls and ceiling are covered with electromagnetic absorbers. Therefore, the inner chamber which has no stirrer acts as a semi-anechoic chamber, whereas the outer chamber acts as a reverberation chamber (RC) and the proposed test setup shows a hybrid characteristic. In this study, firstly, the field uniformity of the outer RC is experimentally verified considering the IEC 61000-4-21 standard in the frequency range of 2-10 GHz. Afterwards, both the shielding effectiveness of the conductive fabric and the dynamic range of the proposed nested reverberation chamber (NRC) technique are obtained. Moreover, the obtained results are compared with the MIL-DTL-83528G test method.