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2. RF and microwave filter - Wikipedia

   en.wikipedia.org/wiki/RF_and_microwave_filter

   Appearance. Radio frequency (RF) and microwave filters represent a class of electronic filter, designed to operate on signals in the megahertz to gigahertz frequency ranges ( medium frequency to extremely high frequency ). It is component that is used in electronic systems to pass or reject specific frequencies and attenuate of unwanted signals ...

3. Filter (signal processing) - Wikipedia

   en.wikipedia.org/wiki/Filter_(signal_processing)

   In signal processing, a filter is a device or process that removes some unwanted components or features from a signal. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect of the signal. Most often, this means removing some frequencies or frequency bands.

4. RF front end - Wikipedia

   en.wikipedia.org/wiki/RF_front_end

   The RF front end consists of the components on the left colored red. In a radio receiver circuit, the RF front end, short for radio frequency front end, is a generic term for all the circuitry between a receiver's antenna input up to and including the mixer stage. [1] It consists of all the components in the receiver that process the signal at ...

5. Band-pass filter - Wikipedia

   en.wikipedia.org/wiki/Band-pass_filter

   Band pass filters can be implemented in 4G and 5G wireless communication systems. Hussaini et al.(2015) stated that, in the application of wireless communication, radio frequency noise is a major concern. In the current development of 5G technology, planer band pass filters are used to suppress RF noises and removing unwanted signals.

6. Mechanical filter - Wikipedia

   en.wikipedia.org/wiki/Mechanical_filter

   It operates at 455 kHz, a common IF for these receivers, and is dimensioned 45 mm × 15 mm × 15 mm (1.77 in × 0.59 in × 0.59 in). A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies. Its purpose is the same as that of a normal electronic filter: to pass a range of signal ...

7. Microwave cavity - Wikipedia

   en.wikipedia.org/wiki/Microwave_cavity

   The cavities serve as resonators ( tank circuits) to determine the frequency of the oscillators. A microwave cavity or radio frequency cavity ( RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave or RF region of the spectrum.