By Timothy Hegarty, Applications Engineer, Texas Instruments This article compares electromagnetic compatibility (EMC) requirements in automotive, industrial and defense product family standards, specifically various test parameters, test equipment, test setups and test methods for radiated emissions (REs). Much like the treatment of conducted emissions [1] in part 1 of this two-part article series, the […]
EMI/RFI
Keeping the noise down
By Patrik Kalbermatten, KEMET Compact nanocrystalline single-phase filters that suppress electromagnetic interference from the power provide engineers with greater design flexibility. In our increasingly connected world, we are ever more dependent on electronic equipment and devices and the semiconductors contained within. It is perhaps no surprise, then, to find that demand for components that […]
A comparison of EMI test setups and specifications for automotive, industrial and defense applications, part 1: conducted emissions
by Timothy Hegarty, Applications Engineer, Texas Instruments This article compares electromagnetic interference (EMI) requirements in automotive, industrial, and defense product family standards, specifically various test parameters, test equipment, test setups, and test methods [1-4] for conducted emissions (CEs). The comparison includes widely used dedicated standards in each industry: Comité International Spécial des Perturbations Radioélectriques (CISPR) […]
RF/Microwave bandpass filter implementations, Part 2: Cavity and comb filters
The well-known and extensively analyzed lumped-element bandpass filter is generally not suitable for the RF/microwave region, but there are many distributed-element, energy-based alternatives. Part 1 of this article established the context for these RF/microwave filters, which operate in the spectrum from several hundred MHz and higher, and increasingly cannot use discrete lumped-circuit elements (RLCs). Instead, […]
RF/Microwave bandpass filter implementations, Part 1: Distributed filters
The well-known and extensively analyzed lumped-element bandpass filter is generally not suitable for the RF/microwave region, but there are many distributed-element, energy-based alternatives. Just say the word “filters,” and for many engineers, the mention of this topic stirs a mix of feelings ranging from fear to relief. Why fear? Because filters as a topic in […]
Rudiments of radiated EMI/EMC
Radiated emissions standards are generally more focused on higher-frequency noise sources. At about 30MHz, there is a transition between concern with conducted and radiated emissions. Above that frequency, conducted emissions are not usually a major problem. And below 30MHz, the various interconnects and conductors in most electronic systems are not effective antennas for emitting radiated […]
Conducted and coupled EMI/EMC concepts
In addition to the International Telecommunications Union (discussed in part 1 of this FAQ series), there are several organizations that define and regulate acceptable levels of conducted and radiated emissions from electronic devices. These various agencies have developed numerous standards generally based on the operational environment of the specific device. Effectively managing EMI is a […]
Soft, conformable EMI absorber material doubles as a gap filler
Electronics are getting more compact, yet also more powerful, especially with the rise of 5G. Components packed into tight spaces produce complex signal interference issues, which can hinder device operability in automotive and other industries. But using standard EMI-mitigating absorbers as an interface between a radiating component and housing can put too much stress on […]
Shielding cans cut EMI on PCBs
Assisting engineers dealing with EMI/RFI issues in their PCB designs, Harwin has just announced the introduction of three new shielding cans. Supplied in a tape-and-reel format, these cans increase the company’s existing range of EMC products. The new can dimensions are 10mm x 10mm, 15mm x 10mm and 30mm x 10mm, all with a 3mm […]
5 things you need to know about 5G filters
by Robert Hammond, Resonant CTO, and Mike Eddy, Resonant VP Product Marketing & Business Development 5G networks operate in new and higher frequency bands, requiring new underlying technology and performance standards for RF filters. The industry must develop new resonating structures in order to filter at these high frequencies, and large bandwidths, with enough power […]
