Peter Matthews

Peter Matthews

Recent Posts

The Facts About Microstrip Filters

Posted by Peter Matthews on Jan 4, 2023 8:45:00 AM

Since our acquisition of Integrated Microwave Corporation (IMC) in 2020, we have extended our range of RF and microwave filtering solutions to include a wide variety of ceramic coaxial resonators, lumped element filters, and cavity filters from the VHF to the Ka band. During this time, we’ve also continued to innovate on and expand our product offering for one of our most popular filter types – the microstrip filter.  

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Topics: RF and Microwave, Filtering

Back to Basics: Breaking Down the Fundamentals of Filters

Posted by Peter Matthews on Dec 14, 2022 8:45:00 AM

To help our customers with filter selection, we generally provide a lot of detailed information on what our various filters can do. However, we thought it also might be really helpful for our customers if we took a step back and covered some background information on how filters do what they do. Regardless of the technology behind the filter, there are several key concepts that all filters share. Therefore, we decided it was time to bring together our top engineers so that we could compile their extensive filtering knowledge into a comprehensive Filter Basics ebook. 

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Topics: RF and Microwave, Filtering

Cavity Filters: High Performance Under High Power

Posted by Peter Matthews on Nov 30, 2022 8:45:00 AM

As discussed in previous blog posts, resonators are the building blocks used to create filters. Recently, we published a blog post that discussed two different types of resonators – coaxial ceramic and dielectric. In this post, we will cover the details of a third type of resonator – the cavity resonator.

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Topics: RF and Microwave, Filtering

High Q Capacitors for RF Power

Posted by Peter Matthews on Nov 22, 2022 8:15:00 AM

The generation of RF energy is critical for a wide range of technologies including magnetic resonance imaging (MRI), semiconductor manufacturing, industrial lasers, and wireless charging systems that require high-frequency current and minimal instances of power loss. For example, with an industrial laser, the RF plasma excitation, which is when electrons are broken off an atomic bond and plasma forms, requires RF sources ranging from 1kHz to 40.68MHz depending on the energy required, and a CO2 laser RF power supply that contains a standard source at 13.56MHz, 81MHz, or 125MHz.

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Topics: Capacitor, RF and Microwave

Are COTS Components Ready for Space?

Posted by Peter Matthews on Nov 16, 2022 8:45:00 AM

After decades of viewing MIL-SPECs as the gold standard for qualifying and screening parts for viability in space, NASA has recently changed course, and is adopting commercial-off-the-shelf (COTS) parts as an option for a variety of space applications. Burgeoning changes in industry trends, a drive to remain competitive, and the desire to guide budget-constrained missions pushed the organization to commission a NASA Engineering and Safety Center (NESC) study to evaluate the reliability of COTS parts. Upon completion of the study, NASA aims to create a consistent set of requirements at the agency level to minimize risk and impact of part selection/usage on the performance of NASA spaceflight technology.

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Topics: Military and Aerospace

Filter Basics 11: What Are S-Parameters and What Can They Tell Us About a Filter?

Posted by Peter Matthews on Nov 2, 2022 8:45:00 AM

To help customers with filter selection, we generally provide a lot of information on what our filters can do. But in this new Filter Basics Series, we are taking a step back to cover some background information on how filters do what they do. Regardless of the technology behind the filter, there are several key concepts that all filters share that we will dive into throughout this series. By providing this detailed fundamental filter information, we hope to help you simplify your future filtering decisions. 

In part 11, the last post in our Filter Basics series, we review the information S-parameters can tell you about a filter’s performance and show an example of how to plot a filter’s S-parameters using a free open-source tool.

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Topics: Filtering

Filter Basics 10: Resonators as Microwave Devices

Posted by Peter Matthews on Oct 12, 2022 8:45:00 AM

To help customers with filter selection, we generally provide a lot of information on what our filters can do. But in this new Filter Basics Series, we are taking a step back to cover some background information on how filters do what they do. Regardless of the technology behind the filter, there are several key concepts that all filters share that we will dive into throughout this series. By providing this detailed fundamental filter information, we hope to help you simplify your future filtering decisions.

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Lumped Element Filters: A Compact, Low-Frequency Filtering Option

Posted by Peter Matthews on Sep 21, 2022 8:45:00 AM

At Knowles Precision Devices, we are well known for our expertise delivering high-performance mmWave filtering options. But did you know we also excel at providing a wide variety of lower frequency filtering options using a lumped element filter construction? In this blog post, we explore the basics of lumped element filter design, general lumped element filter characteristics, and how we can push lumped element filter design limits to develop a wide variety of high-performance low-frequency filtering options.

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Topics: RF and Microwave, Filtering

Filter Basics 9: An Introduction to Poles and Zeros

Posted by Peter Matthews on Sep 14, 2022 8:45:00 AM

To help customers with filter selection, we generally provide a lot of information on what our filters can do. But in this new Filter Basics Series, we are taking a step back to cover some background information on how filters do what they do. Regardless of the technology behind the filter, there are several key concepts that all filters share that we will dive into throughout this series. By providing this detailed fundamental filter information, we hope to help you simplify your future filtering decisions. 

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Topics: Filtering

Understanding The Basics of Ceramic Coaxial Resonator Filters

Posted by Peter Matthews on Sep 7, 2022 8:45:00 AM

Before jumping into a discussion on ceramic coaxial resonators, it is important to understand what a resonator is and how these electrical components work. In general, a resonator is an essential component for constructing a bandpass filter since the resonator is what will allow specified frequencies, or bands of frequencies, to pass through the filter as shown in Figure 1.

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Topics: RF and Microwave, Filtering

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.

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

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