Electromagnetic Shielding

Abstract

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Theoretical Approach of Electromagnetic Shielding of Multilayer Conductive Sheets

“…Using the input-output relationship of the transmission coefficient [19], we can express SE of a multilayer shield, with negligible the internal multiple reflections, as:…”

“…Finally, the reflection loss, absorption loss and shielding effectiveness of multilayered conductive sheets in contact with two semi-infinite air media can be calculated using, respectively, relations (18), (19) and (17), such as:…”

“…A (dB) represents the absorption loss of the wave as it proceeds through the barrier, and M (dB) represents additional effects of multiple re-reflections and transmissions [18]. The M (dB) term is often negligible with respect to R (dB) and A (dB) terms, especially in the high frequency range [19]. The transmission line theory is used for determination of shielding effectiveness of multilayered structure.…”

Comparison of two methods for magnetic field synthesis on a solenoid’s axis

“…The opposite field must have the same frequency and amplitude as the external field. If the incident field presents a wide bandwidth, the final aim is to generate an opposite field in the same frequency range or at least in a range as large as possible [3]. This paper is a continuation of [4,5] and discusses the problem of finding the shape of a solenoid which produces a given field on the axis.…”

A NOVEL SHIELD FOR GSM 1800 MHz BAND USING FREQUENCY SELECTIVE SURFACE

“…Frequency Selective Surfaces are exhaustively studied in the literature [1,2] and implemented for gamut of applications especially in shielding [3][4][5][6][7]. The erstwhile contribution from FSS's designed for shielding GSM signals have their array elements as square [8,9] and ring geometries [9].…”