December 17, 2018
In simple terms, radiated EMI emission starts from an emitting source, propagates via a radiating path and reaches a susceptible receiver. The strength of the radiated EMI is determined by the source, the media surrounding the source and the distance between the source and the susceptor1…unless there are cables in close proximity to the source or receptor, in which case all bets are off. In that case you need EMI shielding tape.
Electronic or electrical cables can compound EMI noise problems as they are major transmitter of stray signals. Unshielded cables can act as a conductor, sending direct disruption to sensitive ... Read more
November 7, 2018
Every once in awhile true innovation transforms an industry. Consider what the cloud has meant for business as it brought about data storage, access and co-worker collaboration. Look at how the Internet of Things is frontiering cashierless shopping. Such champions in innovation will not only make the industry and applications they integrate with faster, easier or better, they change the way we think about what’s possible. Over time these disruptors soon become the new industry standard and we wonder how we lived without them before their introduction. For the EMI/RFI shielding industry, this transformative shift is now taking place in ... Read more
September 19, 2018
Conductive Silicones are often an essential component for hardened boxes and enclosures where environmental sealing and EMI/RFI shielding is required. The typical silicone-based gaskets and seals are impregnated with nickel, silver, copper, aluminum or other conductive particles to give non-conductive silicone their conductivity while providing IP rated environmental sealing that is required in many military electronic applications. These Conductive Silicone materials are also very flexible and can be formed into sheets, extrusions in various profiles, strips, washers and custom molded parts to fit almost any specific requirement, regardless of how unique.
But the one issue with these essential conductive silicone ... Read more
August 15, 2018
Hardened enclosures come in all shapes and sizes. When you compound the possibilities of various applications, industries, specifications and regulatory authorities, it’s no wonder that standard sizes, types or material for shielding a hardened enclosure rarely meet specific needs for any given project. Even though most hardened enclosures are custom designed with specific requirements in mind they often have one thing in common: They all must breathe to allow cooling of sensitive electronic equipment while also being protecting from EMI/RFI.
Up until now this has been an ongoing problem for engineers. Rarely are enclosures designed to be able to use standardized ... Read more
July 19, 2018
The smallest details are often the ones that will determine whether an EMI hardened enclosure will be compliant or will not meet EMC requirements. That’s especially true when it comes to the many bolts, screws, rods or shafts that need EMI/RFI shielding or grounding. When you have to attenuate a signal or ground components of an enclosure, don’t forget the EMI/RFI wire mesh grounding or conductive washer. Here’s what you need to know:
EMI/RFI Wire Mesh Grounding Washers
EMI/RFI wire mesh grounding washers are made from wire mesh socks that look somewhat like thin knitted metal hoses before being compressed in a ... Read more
June 20, 2018
There is no doubt that plastics have their design advantages when building many hardened enclosures. Plastics products in various forms, such as acrylics, ABS or structural foams, are quick and inexpensive to produce once tooling is in place and can be molded or configured in complex designs much more readily than some other substrates. But because plastics are electrical insulators which easily allow EMI or RFI waves to penetrate the substrate, conductive coatings, i.e. conductive paints, pick up the slack where plastic alone would allow failure of your hardened enclosure. It becomes imperative, therefore, to consider conductive coatings when using ... Read more
June 1, 2018
Think about the need for EMI shielded ventilation panels – what they do and why you need them. Are you fully protecting that hardened enclosure with the right option? Does it measure up to standards for your civilian or military application?
EMI shielded vent panels are the understated hero of hardened enclosures. Second only to an access panel or door in terms of size, ventilation panels can act like a giant antenna, inviting outside EMI or RFI signals in. At the same time, passive and ambient air vents or fan ventilation panels can also form a major conduit which lets uncontained ... Read more
May 21, 2018
Definitions & Distinctions
HEMP is defined as an instantaneous, intense electromagnetic pulse (EMP) field that can overlaod and disrupt from great distances electrical systems and microcircuits. It is generally assumed if one occurred it would be set off by a high altitude nuclear explosion; obtainable by missle flight1 or, more recnetly believed, from a satellite. The only real defense for an event is with HEMP shielding.
IEMI is defined as an intentional malicious generation of electromagnetic energy introducing noise or signals into electric and electronic systems, thereby disrupting, confusing or damaging the systems for the purpose of criminal or terrorist activities2. It ... Read more
March 13, 2017
EMI/RFI Wire Mesh Grounding Washers And Conductive Elastomer Washers
With expertise in EMI/RFI shielding products development to be utilized in military and commercial applications, the engineers at MAJR Products provide EMC compliance and electrical safety grounding equipment. The grounding and conductive washers produced by MAJR Products are designed and manufactured to suit the needs of your specific application.
EMI/RFI Wire Mesh Grounding Washers
EMI grounding washers are designed to ensure positive electrical contact and EMC assurance for electronic equipment and shielded enclosures. MAJR Products’ extensive EMI/RFI shielding equipment development experience led us to design our knit wire mesh grounding washers with a goal ... Read more
February 19, 2014
What It Is and Where It’s Used
A MAJR Products Corp. Article by Mike Oliver
What is Conductive Rubber?
Definition: Conductive Rubber is a generic term referring to any rubberized material with conductive properties which reduce or eliminate the EMI/RFI (electromagnetic interference and radio frequency interference) “noise” that is often associated with electronics.
While there are a handful of materials that might be considered Conductive Rubber, this article will be focusing on the three common material types. Multicon (oriented wire in either sponge or solid silicone) Conductive Silicone (metallized filled silicones), and Radthin (wire screen imbedded into silicone). Each material is unique ... Read more