Filter Shape Factor and Selectivity

Posted by Peter Matthews on Jan 21, 2020 9:00:00 AM

An Ideal Filter

The Ideal Filter would have unit gain (0dB) in its pass band and a gain of zero (-infinity dB) in its stop band. Between pass band and stop band there would be no indecision and would transition from 0dB to -infinity dB asymptotically. It would pass only the required frequencies without adding or subtracting anything from the signal and like a very discrete and fastidious butler we would not see it - just its perfect management of the frequencies in its care.

Read More

Topics: Filter, Bandpass

Clarifying MIL-STD-461 and EMI Filter Misconceptions

Posted by Peter Matthews on Jan 3, 2020 9:43:00 AM

The US MIL-STD-461 specification manages electromagnetic interference emissions by setting limits on the levels that can be emitted from electrical equipment. This specification also sets regulation to control equipment susceptibility to external noise sources and establishes guidelines for properly measuring the relevant equipment features.

Read More

Topics: Filter, Capacitor

Application and Installation Considerations for EMI Filters

Posted by Peter Matthews on Dec 17, 2019 10:59:00 AM

EMI filtering plays an important role in reducing noise that could interfere with other devices; in medical or defense applications, for example, false alarms due to external interference could be detrimental. Here, we will continue our EMI filtering exploration with application and installation considerations. For earlier reading, review EMI filtering basics and filter performance.

Read More

Topics: Filter, Capacitor

Insertion Loss and Performance in EMI Filtering

Posted by Peter Matthews on Nov 26, 2019 1:31:00 PM

To comply with international legislation such as the EU Directive on EMC or the FCC, EMI filtering is an essential element of equipment design. Here, we will continue to explore EMI filtering through insertion loss and filtering performance.

The insertion loss performance shows signal attenuation at any given frequency. As a metric, the insertion loss performance is most useful as a guide in the filter selection process; the actual performance in service can vary depending on circuit characteristics.

Read More

Topics: Filter, Capacitor

Introduction to EMI Filtering

Posted by Peter Matthews on Oct 22, 2019 10:34:00 AM

With the ever-increasing use of electronic equipment comes a greater likelihood of interference from all the other equipment out there. In the same vein, we’re seeing more circuits, with lower power levels, that are easily disturbed; so, there’s a need to protect equipment from EMI (electromagnetic interference). In automotive or medical applications, for example, there can be no false alarms due to external interference. The level of uncertainty has pushed EMI compliance testing to the component level.

To meet international legislation such as the EU Directive on EMC or the FCC, EMI filtering is an essential element of equipment design. Introducing screening measures to case or cables, for example, may suffice in many instances, but you might need to introduce low-pass filtering for additional protection as well. Here, we will begin to explore EMI filtering and the terminology used in designing effective protection.

Read More

Topics: Filter

Knowles Precision Devices Selected to Support Joint Strike Fighter Program

Posted by Peter Matthews on Oct 14, 2019 9:00:00 AM

As aerospace and defense technology advances, manufacturers need to find ways to incorporate more features without simply making planes larger, heavier, and increasingly more expensive. This is why the size, weight, power, and cost (SWaP-C) is often a driving factor for aerospace and defense companies when awarding contracts to component manufacturers.

Read More

Topics: Filter

5G Filtering Solutions eBook

Posted by Peter Matthews on Sep 9, 2019 7:50:00 AM

RF Filters are an integral part of radio systems, required for keeping the right signals ‘in’ and the wrong signals ‘out’ on both the Transmit and Receive sides of the system.

Read More

Topics: Filter, 5G, mmWave

Explore Comprehensive Resources for 5G Filtering Technology

Posted by Peter Matthews on Sep 3, 2019 10:05:00 AM

As mobile wireless technology moves from LTE to 5G, a common question we hear is “How is filtering going to be handled in the unfamiliar territory of millimeter wavelengths?” There is a lot of uncertainty around what filters will be required, where they need to be placed in the base station, how good they need to be, and so forth.

Read More

Topics: Filter, 5G, mmWave

Practical Innovation at Knowles Precision Devices

Posted by Peter Matthews on Aug 28, 2019 9:10:00 AM

Innovating essential high technology systems with demanding specifications is always challenging; making any sort of difference requires extensive resources and deep subject matter knowledge.

But that’s what keeps it interesting.

Read More

Topics: Filter, Capacitor, Single Layer Capacitor, mmWave

Planar Filter Technology for Millimeter Wave Applications

Posted by Peter Matthews on Aug 21, 2019 9:29:00 AM

The advent of fifth generation (5G) communications brings an increased interest in Millimeter Wave (mmWave) technologies. One of the biggest technology challenges engineers face with 5G is how to implement sufficiently high-performance RF filtering in mmWave applications. Given the frequencies involved a distributed element planar approach, such as using Microstrip or Stripline, is often ideal for constructing resonators and filters.

Read More

Topics: Filter, mmWave, Microstrip

Insights Into Precision Passive Devices

Knowles Precision Devices is a premier global source for Capacitors, RF Filters, EMI Filters, Resonators, non-magnetic components and advanced dielectric materials. An umbrella for the brands of Compex, DLI, Johanson MFG, Novacap, Syfer and Voltronics, Knowles Precision Devices serves a variety of markets including military, aerospace/avionics, medical equipment, implantable devices, EMI and connector filtering, oil exploration, instrumentation, industrial electronics, automotive, telecoms and data networks.

This Blog will provide insights into:

  • Filters for 5G and mmWave
  • Capacitors for High Voltage
  • Capacitors for High Reliability

and much more. Subscribe below to stay informed.

Subscribe Here!

Recent Posts