EMI-CAT-Essentials 1213
117Pages

ABOUT LAIRD Laird is a global technology business focused on enabling wireless communication and smart systems, and providing components and systems that protect electronics. Laird operates through two divisions, Wireless Systems and Performance Materials. Wireless Systems solutions include antenna systems, embedded wireless modules, telematics products and wireless automation and control solutions. Performance Materials solutions include electromagnetic interference shielding, thermal management and signal integrity products. As a leader in the design, supply and support of innovative...

BOARD LEVEL SHIELDS 6 Product Selection Guide 6 Standard Design Shields 9 Product Selection Guide 14 Recyclable Clean Copper 18 Slot Mount Series 19 Dual Slot Series 21 Compact PCI Symmetrical Mount 22 Alternate Slot Series 22 Variable Slot Mount 23 Symmetrical (S3) Slotted Shielding 24 Solid Top (S3) Symmetrical Slotted Shielding 25 Clip-On Symmetrical Shielding 26 Low Profile Hook-On Gasket 31 Large Enclosure Series 32 Double-Sided Contact Series 32 Stainless Steel I/O Shielding 33 Flexible Low Compression Series 34 Clip-On Twist Series 34 Divider Edge Shielding 35 Card Guide Clip-On 36...

BOARD LEVEL SHIELDS 6 Product Selection Guide 6 Standard Design Shields 9 Product Selection Guide 14 Recyclable Clean Copper 18 Slot Mount Series 19 Dual Slot Series 21 Compact PCI Symmetrical Mount 22 Alternate Slot Series 22 Variable Slot Mount 23 Symmetrical (S3) Slotted Shielding 24 Solid Top (S3) Symmetrical Slotted Shielding 25 Clip-On Symmetrical Shielding 26 Low Profile Hook-On Gasket 31 Large Enclosure Series 32 Double-Sided Contact Series 32 Stainless Steel I/O Shielding 33 Flexible Low Compression Series 34 Clip-On Twist Series 34 Divider Edge Shielding 35 Card Guide Clip-On 36...

EMI INTRODUCTION Overview of EMC/RFI Issues The phenomenon of electromagnetic interference (EMI) is familiar to virtually everyone, even if they do not understand the underlying principles. Most people have witnessed firsthand the effects of interference. To control EMI, government organizations, such as the FCC, CSA, and EEC, mandate that manufacturers may not design, produce or sell electronic equipment that jams the public broadcast services. In other instances, however, EMI can constitute more than a mere nuisance. The military and medical communities, for example, require trouble-free...

Fabric-Over-Foam and Conductive Foam Wire Mesh • Shielding or grounding of computer and telecommunication equipment seams and apertures • Covers opened infrequently for servicing (6-12 times per year) • Long lasting resiliency is ideal for highly sensitive components in permanent or semi-permanent enclosures • Consistent point-to-point contact for high shielding effectiveness over the life of the gasket • Design flexibility provides grounding and shielding solutions for I/O shielding panels, disk drive insulators, ground planes or circuit boards, electromedical devices, keyboard devices •...

Board-Level Shields • Ideal for high-cycling applications requiring frequent access • Ideal in wiping applications when gasket needs to be engaged from either the top or side • Wide variety of profiles and mounting methods accommodating applications from small handheld devices to room-size enclosures • All applications that require shielding of board- level components • Low height down to 0.04 (1,0) accommodating mother/daughter board configurations • Secure cover design ideal for applications subject to shock and vibration such as mobile military vehicles, commercial aircraft, and wireless...

Electrically Conductive Elastomers Oriented Wire Microwave Absorbers • Ideal for applications with miniature electrical housings, thin wall construction, and intricate multicomponents (i.e., cell phones, handheld devices, medical instrumentation and equipment) • EMI and environmental sealing applications where flat or groove mounting surface requires a complex molded or extruded shape • Providing both EMI shielding and an environmental seal on cast or machined surfaces • Vulcanized frame configurations can be used with pre-cast housings, vent panels, and computer terminal window frames •...

BOARD LEVEL SHIELDS PRODUCT SELECTION GUIDE Corner Feature Traditional Folded BLS Design Type / Features Rigid Corner Full Drawn w/ Flange Full Drawn Zero Flange Improves Flatness by increasing torsional rigidity Most mechanically rigid, but depth attainable is material and configuration dependent Similar to Full Drawn, Tooling more complex. Key Attributes & Application Consideration SINGLE PIECE Single Piece Simple low cost BLS Solution TWO PIECE Traditional Frame Cover Post Reflow Component Access for inspect, test, cleaning, etc. Various cover retention features available to address...

Unique Product Features Mounting Features ReMovl Pick & Place Bridge Easy removal of pick and place bridge for post reflow inspection Thru Hole Loc Pins Size & Shape Pins, Tabs, Etc. Interior Walls Typical Material Thickness Low Height (less than 2 mm) Typical Length & Width Through hole style pin that engages to underside of PCB by mechanical engagement. Cost Position Best Applications Most common BLS solutions Hi Performance BLS solutions (Mechanical & Environmental) BLS Covers, Specialty Military Specialty BLS applications Integrated Spring Contacts

BOARD LEVEL SHIELDS Whether it’s a one-piece shield, multi-compartmental shield or precision contact, each solution Laird delivers is designed to provide maximum performance within a minimum timeline. Laird produces metal electronic components for surface mount applications in a variety of industries. Laird expertise in a number of key areas ensures that the part provided not only performs, but also optimizes applications. After determining the right board level shield or contact design for an application, Laird experts use the latest systems to develop part designs in just hours. Laird...