The function of an RF filter is to retain signals within a specific frequency band and filter out signals outside that band, thereby enhancing the signal's immunity to interference and signal-to-noise ratio. Our filter products are categorized based on different application scenarios, including GPS filters for satellite positioning systems WiFi filters used in the front-end of wireless connection systems, filters suitable for mobile communications, etc. Currently, the company mainly adopts SAW, IPD, and other processes. The aforementioned products are primarily applied to mobile intelligent terminals such as smartphones. Taking the surface acoustic wave filter as an example, its working principle is illustrated in the figure below: The input electrical signal is converted into an acoustic wave of the same frequency by an input interdigital transducer, and then converted back into an electrical signal by an output interdigital transducer, thus achieving frequency selection.