A filter is a device used in signal base stations, cell phones, and other communication mobile devices. The role of the filter is mainly used to analyze and test the spectrum of the received signal and noise clutter harmonics, by filtering out the interference noise, the signal of interest from a large number of signals. Its working principle is through the internal inductance and capacitance composed of low-pass filtering circuit, using and screening both received signals DC, AC current through the coil winding resistance, so that the filter can have a frequency selection circuit, and has the function of filtering out noise and separating a variety of different signals. Currently, filters have an irreplaceable role in the field of daily signal processing, according to IDC's data statistics, 2021 global filter sales have exceeded $ 10 billion, China's filter sales of $ 2.6 billion, Murata, Broadcom, the sun induced electricity, the top three vendors have a combined market share of up to 87%.
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