Shielding effectiveness of flat samples and conductive gaskets: New measuring cell for the frequency range 1–18 GHZ

In the past, different methods have been defined and some standardised for the characterisation of flat samples of shielding materials. Basically, the methods are based on three principles: coaxial cell methods simulating far field conditions, near-field cells (especially magnetic near field) and methods based on a modified Mil Std 285 design. The first two are typically restricted up to the frequency of around 1 GHz, and only the latter one allows measurements above 1 GHz. There is a lack of simple measuring setups in order to characterise the shielding effectiveness of small flat samples in this frequency range of 1- 18 GHz. In this paper, the design and construction of such a measuring is cell is discussed and a first set of measurements is summarised.