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, […]
EMI/RFI
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 […]
Analog Top Talks in December on EDABoard.com forums
Peer-to-peer, engineer-to-engineer questions and answers from the EDABoard.com engineering community around analog ICs and analog design. Click the “Read more” link and follow the entire conversation and maybe add your two cents by logging in to EDAboard.com. Signal integrity problem in a 100MHZ CLK – I am wondering about a signal integrity issue with a […]
Custom EMI/RFI shields attach using off-the-shelf clips
Custom EMI/RFI shields that attach using off-the-shelf clips, can be surface mounted by pick and place equipment, and are easily removed without damaging the shield or board-mounted components are being introduced by Photofabrication Engineering, Inc. (PEI). PEI Snap-On EMI/RFI Shields are made to customer specification from nickel-silver to precisely protect components from radio frequency/electromagnetic interference […]
Catalog covers EMI/RFI shielding products
Available in both interactive PDF and printed versions, the 2018 catalog details all standard and custom EMI/RFI shielding product options. The PDF format lets the user click to download interactive sales drawings on over 150 products, including finger stock profiles, metalized fabric gaskets, fan vents, and board level shielding. The Table of Contents, Part Number […]
