What is an RF Filter?
An RF Filter, or radio frequency filter, is an electronic filter which is designed to operate on signals in medium to extremely high frequencies. These ranges are used in radio, television and wireless communications. Therefore most RF devices include some kind of filtering on the signals transmitted or received. RF filters enable the required frequencies to be passed through a circuit, while rejecting the frequencies that are not needed. These filters are often used for duplexers and diplexers in order to combine or separate multiple frequency bands. An ideal filter, whether low pass, high pass, or band pass will have a minimal amount of loss within the pass band.
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