Technical Articles on Filters

Technical Articles on Filters are listed on everything RF. This section consists of technical articles written by the everything RF editorial team and by leading companies whose expertise lies around Filters. Visit everything RF to read technical articles on various topics.

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What is a Notch Filter?

Filters

Editorial Team

Jul 25, 2021

A Notch Filter is also known as a Band Stop filter or Band Reject Filter. These filters reject/attenuate signals in a specific frequency band called the stop band frequency range and pass the signals ...read more

What is the difference between a Diplexer and Duplexer?

Filters

Editorial Team

Nov 28, 2016

A Diplexer is a 3-port passive device that allows two different devices to share a common communication channel. It consists of two filters (Low Pass, High Pass or Band Pass) at different frequencies ...read more

What is a SAW Filter?

Filters

Editorial Team

Apr 4, 2019

Surface Acoustic Wave Filters or SAW Filters are compact, low-cost RF filters that can be used in a wide range of applications up to 3 GHz. SAW filters operate by converting electrical energy int...read more

What is 3 dB Bandwidth of a Filter?

Filters

Editorial Team

Nov 4, 2019

An RF filter is used to block unwanted signals in a wireless system. It is designed to allow signals in a particular frequency range to pass through with minimal losses while blocking all other signal...read more

What is Group Delay?

Filters RF Basics

Editorial Team

Dec 2, 2018

All frequency components of a signal are delayed when they pass though a filter. Group delay in a filter is the time delay of the signal through the device under test as a function of frequency. If we...read more

What is a BAW Filter?

Filters

Editorial Team

May 22, 2019

Bulk Acoustic Wave (BAW) Filters are compact, low-cost RF filters that can be used in a wide range of applications up to 6 GHz. Like SAW Filters, BAW filters also operate by converting electrical ener...read more

What are pass band Ripples in a Filter?

Filters

Editorial Team

Dec 2, 2018

Ripples are the fluctuations (measured in dB) in the pass band, or stop band, of a filter’s frequency magnitude response curve. Elliptic and Chebyshev-based filters have constant ripple across their p...read more

What is a Triplexer?

Filters

Editorial Team

Jul 23, 2018

A triplexer is a 4-port filtering device that splits one input in to three different outputs each with a different frequency. It can also be used the other way round and where it routes signals at thr...read more

What are Switched Filter Banks?

Filters Switches

Editorial Team

Jan 12, 2018

Switched Filter Banks consist of a combination of switches and filters integrated in to a single module. These usually consist of an input switch followed by a filter for each channel of the switch, f...read more

What is a Quadplexer?

Filters

Editorial Team

Jul 3, 2019

A quadplexer is a 5-port filtering device that splits one input in to four different outputs, each with a different frequency. It can also be used the other way round and where it routes signals at fo...read more

What is TC-SAW?

Filters

Editorial Team

Nov 19, 2020

Schematic view of a typical TC-SAW stackTC-SAW or Temperature Compensated Surface Acoustic Wave filter, as the name suggests, is SAW filter with improved thermal performance. The center frequency of a...read more

BAW vs SAW Filters

Filters

Editorial Team

Nov 23, 2023

SAW filters and BAW filters are both types of acoustic wave filters (AWFs) that utilize acoustic waves to achieve precise filtering in RF and microwave applications. The primary difference between the...read more

What are Absorptive Filters?

Filters

Terry Wainwright

Wainwright Instruments

Normal passive electromagnetic filters are “reflective”. That means the out-of-band electromagnetic energy is reflected towards its source. Equipment such as transmitters, mixers, amplifie...read more

Bias T, Band Splitter and Other RF Diplexers

Bias Tees Filters

Bree Engineering

A Simple Bias T allows for a DC voltage to be injected into a circuit without directly altering with the RF signal that is being sent through the same circuit.Band Dividers – Rough Broad Band Splittin...read more

What are Coexistence Filters?

Filters

Editorial Team

Nov 4, 2019

With the introduction of new technologies and standards every year, the global RF spectrum is getting more and more congested. This has resulted in a significant decrease in the bandwidth or eliminati...read more

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