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The ever-improving functionality of modern smartphones, pods, tablets, and PCs is a testament to the designer’s ability to do more in less space. This article describes techniques and products that can shield sensitive areas from outside interference and help designers control emission levels. Fortunately, while the clock frequencies in our designs have been increasing in number and frequency, the logic voltage levels have been decreasing. Since electromagnetic energy can be reflected, directed, or absorbed, this is where good design techniques and shielding can help. Thankfully, several well-engineered off-the-shelf shielding subassemblies are available (Figure 1). Figure 2: Peel-away covers allow access for development and can be completely sealed with a peel and stick cover piece.
Figure 3: Attenuation plots provide the frequencies and levels that specific enclosures exhibit. An example of a solid top cover comes from Würth with its 36003200 20 x 20 mm shielded top cover.
If you need to make your own shielded enclosures, there are RF accessories that make this an easier task, including PC board mounted fingers, tables, and clips.
These types of metal-formed mini cages and associated connect techniques are typically used with demanding medical, telecommunications, CATV, telemetry, and radar applications. Figure 4: Compartmentalized sections can be defined on a standard PC board to allow control over each stage. The most solidly engineered Faraday-cage-types of enclosures are used in secure military designs, especially for communications and encryption. Figure 5: Solidly machined compartments like those used in Tempest designs do the best job of keeping emissions from leaking out.
Feed-through capacitors such as the Tusconix 4400-680LF allow you to make high-pass, low-pass, band-pass, and notch types of filters through the interconnects from stage to stage. Figure 6: Simple feed-through capacitors can be press-fit into a chassis or compartment walls to let signals pass inside shielded sections. For chassis-partitioned, low-noise designs, these types of filter parts reduce emissions and susceptibility and come in leaded, leadless, turret, hook, soldertail, and press-fit configurations. An effective technique for use with or without a shielded enclosure is an adhesive-based shielding material. Figure 7: Compartmentalized shielded enclosures can use conductive adhesives to seal shielded assemblies and make them weatherproof.
In addition to formed enclosures and sheets, gaskets, tapes, foils, and acrylics are at our disposal to quiet down a noise node or protect a low-level input signal from a harsh and noisy environment. Figure 8: Absorption characteristics for ferrite shield sheets can be optimized for specific needs, for RFID.
General-purpose foil tape types of products like the 3M 1181 X 1", for example, are also very useful as final fixes on the assembly line floor. This article has discussed products and techniques that enable engineers to limit the electromagnetic emissions of their designs and reduce the susceptibility of circuits to EMR and EMI so as to achieve regulatory designated levels.
Specified by engineers around the world, Orbel's standard and custom board level shielding (BLS) offers unlimited design flexibility for surface-mount and through-hole configurations. The EZ-Shield Guardian surface-mount shield is a one-piece circuit board shield with alignment pins to ensure stability during reflow and soldering. The EZ-Shield Guardian through-hole circuit board shield is a one-piece shield with mounting pins. The Snap-Shield Bullzeye is a two-piece surface-mount shield with castellated edges for easy soldering and trace pass-through. The two-piece Snap-Shield LaZerLoc surface-mount shield features alignment pins that ensure stability during reflow and soldering.


The gasket is made of a highly electrically conductive foam with or without an electrically conductive self-adhesive strip on one side.
Worldwide leading manufacturer of EMC (electromagnetic compatibility), EMI (electromagnetic interference) and RFI(radiofrequency interference) shielding solutions.
Keep up to date with the latest developments in Holland Shielding Systems BV by signing up for our newsletter. EMI screening covers (shielding cans) for PCBs were developed to shield only certain parts of electronic equipment from electromagnetic radiation at the source, rather than all components in the entire housing. Whether its for a small number of prototypes, or large production runs, we can manufacture the precision components you require. Our standard PCB shielding cans are closed completely with the exception of the bottom of course. For large production runs above 10,000 pieces it is possible to deliver the 1500 series PCB shielding cans on tape or on reel. To get a quotation for Clip-on PCB shielding system within 24 hours fill in the form below. All devices, materials, components, data sheets, and training materials are available online on the Digi-Key website.
Add in the fact that designers prefer sharp, clean edges on digital lines (fast rise and fall times), and that the sharper the edge, the more harmonics result.
Board mounted shields such as the Laird BMI-S-105 come in a variety of sizes and shapes that can be accommodated on our printed-circuit boards. Manufacturers such as Laird provide attenuation plots which indicate the frequencies and levels at which an enclosure attenuates (Figure 3). Springy clips such as the Harwin S1791-42R, for example, can provide retention force for a shielding assembly while providing a shield ground conductive feed. The aforementioned products also allow you to use standard printed-circuit board technology and achieve a (somewhat) compartmentalized partitioning (Figure 4).
A very demanding classification known as Tempest uses compartmentalized metal enclosures and clever geometric placements to isolate functional stages and control signal flow (Figure 5).
A press-fit leadless version like the 2463-001-X5S0-471MLF can be used in a more automated fabrication environment (Figure 6). A Tusonix training module on feed-through capacitors and filters is available on the Digi-Key website.
For most applications simpler, lower-cost, and lower-weight shielding materials and meshes will suffice. If the wavelength is smaller than the mesh opening size, it will penetrate, albeit at an attenuated and somewhat scattered level. The hardware-store-variety, metal-screen-door-type mesh material may be readily available and low cost, but it may not have the characteristics of a material specifically made for shielding applications. A stick-on shield sheet such as the Laird 3536-S is composed of magnetic particles in a polymer binder that absorbs energy in the 50 MHz to 3 GHz range.
They not only seal corners and apertures in formed shield cases, but also can conduct away heat from critical areas. For more information on the products mentioned, use the links provided to access product pages on the Digi-Key website. We also offer the industry's fastest turnaround times, minimal startup costs, and unmatched customer service. Whether you're in need of one-piece, two-piece, multi-cavity, or custom-configured board level shielding, Orbel is the one name you need to know. Zero corner slots for high RFI integrity when specifying larger and more complicated shields in hand placement applications.
The electrically conductive foam can be compressed up to more than 50 % of its original height.
If you have two neighboring sources of interference you can also place two PCB shielding cans right next to each other, making the shieldings into one large can.


To prevent short-circuiting, it is posible to make a recess area's in the PCB shielding can. If the source of radiation or inteference produces much heat, it would be wise to make ventilation holes in the shielding can.. If you are afraid that vibrations or movements will set the PCB shielding can free from the RF shielding clips, then you can fix the PCB shielding can with a spud. If you are afraid that vibrations or movements will set the PCB shielding can free from the RF shielding clips, then you can also place a piece of soft compressable foam between the PCB and the housing of the device. However, we can make many alterations to our PCB shielding cans to meet your specifications, such as: holes in any desired diameter for the passage of cables, higher angles on the PCB shield, allowing the can to be soldered directly onto the PCB (no need for mounting clips or pins anymore) or a self-adhesive removable top cover. Solder direct onto PCB "Solder land" (Also, see our 1510 series Fixed PCB shielding cans, the same as the 1500 series Clip -on PCB shielding cans, but with teeth in order to glue the can onto the PCB.
This is problematic, for example, when trying to recover very low level signals through an antenna. On the other hand, this blessing can also prove to be a curse, as lower level signals are more susceptible to noise and interference from local sources.
These solder to the boards and have vent holes to allow outgassing during the soldering process. For more information, a training module on EMI shielding devices and techniques is available on the Digi-Key website. Similarly, standard contacts like the Laird BMI-C-001 provide spring-loaded axis profiled conduction points. Make sure to lay out your PCB so to be able to accept these fixes by leaving a little space without traces for the adhesive metal tape. An example of this is in the automobile where radio, navigation, hands-free phone use, and even wireless Internet access are all placed in close proximity on the dashboard. BLS shielding can also be custom-engineered from start to finish based on your specific need. To do this, you will need holes on the right places in the design of your PCB and your PCB shielding can. For electric discharge, you can use a EMI gasket or an electrically conductive foam as well. The option for alterations apply to general features as well: it is possible to produce our PCB shielding cans in virtually any type, shape or size. In addition to providing immunity from surrounding noise, the designer also faces a critical need to squelch emissions to meet strict electromagnetic radiation (EMR) and radio frequency interference (RFI) compliance regulations. Peel-away top coverings are available to gain access during development and to seal the tops electromagnetically if needed (Figure 2). Signals pass from one stage to another through the use of devices such as feed-through capacitors. Caulk-like adhesives and sealers can even provide conductivity for demanding, compartmentalized designs (Figure 7).
It is critical that all of these circuits work correctly together in the presence of other circuits without interference. In 1982, in addition to emissions standards, the FCC was given the authority to regulate the susceptibility of consumer electronic devices to EMR.



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