Questions & Answers on Filters

What is the difference between a Diplexer and Duplexer?

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 connected to a single antenna. In the figure below, Signal A at Frequency A enters the Diplexer and passes through Filter A to the antenna. Singal B at frequency B, passes through Filter B to the same...read more

What is a Notch Filter?

Filters

Editorial Team

Aug 29, 2018

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 above and below this band. For example, if a Notch Filter has a stop band frequency from 1500 MHz to 1550 MHz, it will pass all signals from DC to 1500 MHz and above 1550 MHz. It will only block those...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 three different frequencies to a single port. A triplexer enables a single co-axial cable to run into the feed of three different antennas.This bi-directional device usually consists of 3 bandpass filter...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, followed by an output switch. Integrating filter and switch components in a module eliminates transitions between circuits, providing for optimal matching which results in better insertion loss, flatne...read more

BAW vs SAW Filters

Filters

What is the difference between BAW (Bulk Acoustic Wave) and SAW (Surface Acoustic Wave) RF Filters?

Answer

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.A good benefit to this is the ability to provide power from the injected source location to the desired component that would need power. (Antennas, Amplifier, diodes, transistors and more RF components)The reason why being able to inject a D...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 take the example of a modulated sine wave, for example an AM radio signal. Group delay is a measurement of the time taken by the modulated signal to get through the system.Group Delay is measured in ...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 pass bands. While Bessel and Butterworth derived filters have no ripple in their pass band responses. Ripples in the stop band response are called as out-of-band ripple.

What are Cavity Filters?

Filters

What are cavity filters? Why and when are they used over other filter technologies?

Answer

What is a Harmonic Filter?

Filters

Answer

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