Shielding can be a stand-alone solution, but it is more cost-effective when used in conjunction with other suppression techniques such as grounding, filtering, and, as mentioned earlier, proper circuit-board design to minimize the loop area. The ability of the shielding to block or absorb the RF signals is determined by several factors – the conductivity of the material, the permeability of the material, and the material thickness. However, regardless of the gasket type, key factors to consider when choosing a gasket are RF impedance (R + jX, where R = resistance, jX = inductive reactance), shielding effectiveness, compressibility, compression forces, compression range, compression set, and environmental sealing. This overview of shielding approaches shows that basic shielding theory is really not so basic.
The resonant frequency is the frequency where integer half-wavelengths correspond to the dimension of the shielding enclosure.

In addition to metal shields that surround key circuits, additional shielding in the form of gaskets and other materials are often used to effectively shield as much of the entire enclosure as possible.
Unfortunately, designers often leave shielding as a last option since the shields can be installed once the design is completed.
However, shielding gaskets typically fall into four principle categories: beryllium copper and other metal spring fingers, knitted wire mesh, conductive particle filled elastomers, and conductive fabric-over-foam. This article will examine some of the approaches and off-the-shelf products that can be used to minimize RF interference through the use of shielding and ground planes to prevent spurious signals from interfering with wireless system operation.
However, by incorporating shielding considerations from the beginning of the design process, designers can deliver a more cost-effective and generally more efficient system design.

In addition to the many off-the-shelf solutions, designers can work with the shielding vendors to create a custom shape to meet their specific system needs. Part of the design challenge for shielding must take into account such issues as airflow, mechanical strength, and still other factors.

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