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• W2047251204 abstract "This paper deals with the theoretical and practical aspects of the shielding efficiency measurements of construction composite materials. This contribution describes an alternative test method of these measurements by using the measurement circular flange. The measured results and parameters of coaxial test flange are also discussed. The measurement circular flange is described by measured scattering parameters in the frequency range from 9 kHz up to 1 GHz. The accuracy of the used shielding efficiency measurement method was checked by brass calibration ring. The suitability of the coaxial test setup was also checked by measurements on the EMC test chamber. This data was compared with the measured data on the real EMC chamber. The whole measurement of shielding efficiency was controlled by the program which runs on a personal computer. This program was created in the VEE Pro environment produced by © Agilent Technology. HE MEASUREMENT of shielding efficiency of shielded, absorbing and EMC chambers or boxes is usually done by the setup which contains the transmitting and receiving antennas, test signal generator and test signal receiver. As test signal receivers are usually used the EMC receivers or spectral analysers. The measurement itself runs as follows. The receiver with the receiving antenna and also with essential cable is situated inside the chamber or tested box. The transmitter (signal generator) and transmitting antenna are placed at the outer side of the tested object. The location of the antennas is changed around the chamber or box and peak signal on desired frequency is recorded by the spectral analyser. The worst case, when the shielding efficiency is the lowest, is reliably identified by the positioning of antennas around the tested chamber (1) and (2). These chambers are usually made from metal plates. The problem arises immediately when it is necessary to measure the shielding effectiveness of the material from which the chamber or box will be constructed. Especially in the development stage it is not possible to construct the whole chambers or boxes in the huge sizes for accurate measurements. This approach is expensive and also time consuming. There are constructional problems which extend the development of the composite materials. A similar problem appears when it is necessary to know the shielding efficiency of construction materials like bricks, plasterboard, concrete etc. These materials could be also called composite materials, especially during their development stage. The main construction problem of the chambers or boxes from these types of materials for the measurement setups mentioned above is the construction of the doors. The door of these chambers or boxes has usually the main influence on the whole shielding efficiency. In other words, the doors always represent the weakest part of these shielded chambers. Construction of the doors from the concrete-based material is really complicated, in a lot of cases nearly impossible." @default.
• W2047251204 created "2016-06-24" @default.
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• W2047251204 date "2009-01-01" @default.
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• W2047251204 title "Electromagnetic Shielding Efficiency Measurement of Composite Materials" @default.
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• W2047251204 doi "https://doi.org/10.2478/v10048-009-0020-8" @default.
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