Microwave-range shielding effectiveness measurements using a dual vibrating intrinsic reverberation chamber

Abstract

Reverberation chambers create a statistical uniformly distributed field which is very useful for reliable electromagnetic interference measurements. Another advantage of these chambers is the high field strength which can be generated compared to conventional test setups. A reverberation chamber made of flexible cloth is called a vibrating intrinsic reverberation chamber (VIRC) and the field stirring is achieved by moving the (angle of) the walls. A new technique for shielding effectiveness measurements is the dual-VIRC method. In this method two VIRCs are combined together via a common wall with an aperture that forms the interface between them. This set-up makes it possible to achieve a very high dynamic range. A main advantage of this technique compared to the nested reverberation set-up is that measurements can be conducted much faster and at much lower frequency.

Latest developments on the shielding effectiveness measurements of materials and gaskets in reverberation chambers

“…4 also shows the coefficient of isolation I s given in (3). Note that IL fixt, s is replaced with IL fixt, pec , which is obtained by (8). The conditions (1) and (3) are both met; moreover, the sufficient condition (4) is also met.…”

“…Note that (8) can be substituted with IL fixt, s in (3), as specified above. The reflecting samples, which can be tested by the method SE 5 , include gaskets, complex PCBs, fabric shield [8], graphene shields [27], band-stop frequency selective surface [28,29] etc. In such cases, (8) can be replaced in (5) when it is written for a sample in the aperture; that is, we can write [10]:…”

“…Fig. 16 shows IL fixt, pec achieved by the application of (6)- (8) and the corresponding result obtained by measurements of the reflection coefficient and application of [10, (10)]. Fig.…”

“…Procedures for [10, (1)] (red trace) and for SE 5 (blue trace) are used. Black and square-marked trace represents SE g from [10, (1)] where IL f ixt, pec is achieved by measurements of the reflection coefficient; blue and cross-marked trace represents SE g from SE 5 where IL f ixt, pec is achieved by (6)- (8). Red and circle-marked trace represents MDR-SE.…”

“…Reverberation chambers (RCs) are used for shielding effectiveness (SE) measurements [1][2][3][4][5][6][7][8][9]. In particular, SE of gaskets and materials are made by using nested RCs (NRCs) [1,2,4,8,9]; contiguous reverberation chambers (CRCs) can also be used [8,9]. It is meant that materials and gaskets include any flat electronic system such as printed circuit board (PCB), PCB assembly (PCBA) etc.…”