Tuesday, January 8, 2008

Emi Vent Panels

EMI Vent panels are designed for very high frequency environment specifications. These comes in various ranges but the standard one provides greater than 90 dB attenuation between 200 MHz and 10 GHz. Emi Vent panels are meant to provide maximum attenuation but the air flow resistance should be minimal. You can also customize the performance of EMI vent panels to meet your shielding requirement and your budget by selecting the appropriate frame style, finish and gasket type. The best thing about EMI vent panels is that these are very light weighted and also free from polarization effects.

EMI vent panels are constructed of aluminum alloy honeycomb but the perimeter frame is made of aluminum extrusion keeping in view the mounting and gasket applications. Steel and brass honeycombs are also available but only on custom basis. There are various options available for the gasket which includes wire mesh, spring finger or conductive fabrics. There are also shielded mesh screens which are designed for shielded electronic enclosures requiring filtered air. Threaded inserts and threaded fasteners are used for mounting purposes. Effectiveness of different EMI vent panels differs are it generally depends on their size, type of material used and the gasket type used.

The one common feature that the entire EMI vent panels share is that all of them offer very less amount of resistance to air flow but it also differs from style to style. As a matter of fact steel and brass honeycombs offer twice as much as resistance than an aluminum one. These EMI vent panels are used for different purposes some of which are: shielding for containment which is used to prevent escape of interferences generated by some device or circuit, shielding for exclusion which is used to prevent the escape of known level of interferences on the performance of the specific device, pressure sealing which is used to provide pressure containment, grounding to conduct electricity from imperfectly grounded structures.