Predicting Shielding Effectiveness of Populated Enclosures Using Absorption Cross Section of PCBs

TY - GEN

T1 - Predicting Shielding Effectiveness of Populated Enclosures Using Absorption Cross Section of PCBs

AU - Parker, Sarah L

AU - Flintoft, Ian D

AU - Marvin, Andy C

AU - Dawson, John F

AU - Bale, Simon J

AU - Robinson, Martin P

AU - Ye, Ming

AU - Wan, Changyong

AU - Zhang, Mengze

N1 - © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

PY - 2016/9/5

Y1 - 2016/9/5

N2 - Shielding effectiveness (SE) is an important measure of how well an enclosure reduces the electromagnetic (EM) field incident upon it. Commonly, when the shielding effectiveness of an enclosure is stated it is for the case when the enclosure is empty. Including contents such as printed circuit boards (PCBs) in the enclosure will affect the shielding effectiveness as the PCB absorbs EM energy. One technique of determining how much energy a PCB absorbs is to measure its absorption cross section (ACS) using a reverberation chamber (RC). The measured ACS can be used to predict the shielding effectiveness of an enclosure when the PCB is inside it using power balance techniques. In this paper the ACS of a number of PCBs are measured both individually and in closely stacked groups. This information is then used to show how the ACS can be used to calculate shielding effectiveness and the results are compared to direct measurement of the SE of the enclosure containing a PCB. Knowledge of the ACS of typical or particular PCBs could be used by engineers to estimate the real shielding effectiveness of an enclosure with contents, when designing electronic systems.

AB - Shielding effectiveness (SE) is an important measure of how well an enclosure reduces the electromagnetic (EM) field incident upon it. Commonly, when the shielding effectiveness of an enclosure is stated it is for the case when the enclosure is empty. Including contents such as printed circuit boards (PCBs) in the enclosure will affect the shielding effectiveness as the PCB absorbs EM energy. One technique of determining how much energy a PCB absorbs is to measure its absorption cross section (ACS) using a reverberation chamber (RC). The measured ACS can be used to predict the shielding effectiveness of an enclosure when the PCB is inside it using power balance techniques. In this paper the ACS of a number of PCBs are measured both individually and in closely stacked groups. This information is then used to show how the ACS can be used to calculate shielding effectiveness and the results are compared to direct measurement of the SE of the enclosure containing a PCB. Knowledge of the ACS of typical or particular PCBs could be used by engineers to estimate the real shielding effectiveness of an enclosure with contents, when designing electronic systems.

KW - Absorption cross section

KW - electromagnetic shielding

KW - reverberation chamber

U2 - 10.1109/EMCEurope.2016.7739305

DO - 10.1109/EMCEurope.2016.7739305

M3 - Conference contribution

SN - 9781509014163

SP - 324

EP - 328

BT - Electromagnetic Compatibility (EMC EUROPE), 2016 International Symposium on

T2 - EMC Europe 2016

Y2 - 5 September 2016 through 9 September 2016

ER -