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Shielded windows

Copper wire meshes, which form a highly conductive shielding medium, are available with a conductive anti-reflective finish which is non-oxidising and which protects the gauze, particularly where copper is used for its high degree of shielding effectiveness. In some instances we can supply the mesh material in its unlaminated form so customers can fabricate their own bespoke windows (WM Series). However we do not recommend this to customers inexperienced in handling fine gauze, which is easily contaminated or damaged.

Windows with a mesh gauze typically have in excess of a 60% open area so provide good light transmission. Attenuation is a function of conductivity, aperture sizes and permeability in relation to field strength and frequency. Conventional mesh materials or surface coatings in windows do not generally provide high attenuation at low frequency in the magnetic field and additional measures should be taken to supplement the screened window performance in such applications. Electric field and plane wave attenuation is, however, normally excellent and this is the area of activity for most non-military window applications.

Applications
Our W Range windows use glass and different types of plastic as their base substrate, and can be treated to imrpove both anti-reflective and scratch-resistant properties. Glass panels can be etched to provide an anti-reflective surface. Tinted 'interlayers' can be built into fully laminated windows to improve their anti-reflective properties particularly where, for example, a non-treated stainless steel gauze is used.

Fully laminated (WF Series) screened windows combine the physical strength and optical clarity of laminated glass or plastic with the shielding effectiveness of fine wire gauze. They compliment the more cost-effective edge-laminated type (WG Series), which are designed primarily for racks and large enclosures. Cast plastic style (WC Series), featuring mesh gauze moulded into clear plastic, complete the W Range.

When specifying the design for a particular application temperature cycling, contamination and possible accidental damage should be taken into account. Glass windows are the most abrasion resistant but not the best for impact resistance. They are better for anti-contamination than plastic. Fully laminated windows gave good properties but are less cost effective than edge-laminated types, which provide an excellent solution for most applications.

Manufacturer/supplier's information

Company name:		P & P Technology Ltd [ Homepage ]
Business address:		Finch Drive, Springwood, Braintree, Essex, United Kingdom
Zip/postal code:		CM7 2SF
Telephone number:		01376 550525
Fax number:		01376 552389
Contact name:		Gerry Steel [ Email ]

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