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.

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Topics: Filter, Bandpass

Broadband Bypass Capacitors For High Speed Optical and mmWave

Posted by Peter Matthews on Feb 27, 2019 3:42:00 PM

Microwave and mmWave frequencies are found in RF applications and in optical communications. As we see increasing interest in mmWave for RF communications and move from 28Gbps to 56Gbps NRZ and 112Gbps PAM4 in the optical world, the system as a whole needs to maintain a high interconnect bandwidth.

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Topics: Filter, Bandpass

Microstrip Filters deliver small size at high frequencies

Posted by Peter Matthews on Nov 7, 2018 4:47:46 PM

When selecting a filter implementation one factor that is common across all frequencies is optimizing the size of the filter given the application and the required performance.

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Topics: Filter, Bandpass, mmWave, Microstrip

RF Filter Terminology and specifications.

Posted by Peter Matthews on Sep 10, 2018 10:59:41 AM

This document is designed to act as a quick reference on some terms that are used to discuss filter technology.

There are four key Filter behaviors that sort them into types: Low Pass, High Pass, Band Pass and Band Stop.

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Topics: Filter, Bandpass, Lowpass, Highpass, Bandstop

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
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