Typical Application Scenarios of Thin-Film Filters in 5G Communication

• Base Station Front-End Systems: Applied in duplexers, combiners, and bandpass filters for Sub-6 GHz frequency bands to achieve frequency isolation and interference suppression, enabling multi-band coexistence. Integrated into Massive MIMO antenna arrays within RF front-end modules for channel selection and signal purification.
• Terminal Devices: Utilized in RF front-end modules (FEM) of smartphones, CPEs, and other terminals. Thin-film acoustic wave filters (such as BAW, SAW) perform band switching and adjacent-channel rejection to meet 5G multi-band and high-isolation requirements, supporting carrier aggregation technology.
• Small Cells and Indoor Distributed Systems: Employed in micro-cells and pico-cells for frequency filtering to optimize signal coverage. Additionally, applied in microwave components of 5G backhaul networks and optical modules.

Leveraging advantages such as high Q-factor, low insertion loss, compact size, and excellent temperature stability, thin-film filters have become critical components in 5G RF front-end systems, supporting the performance demands of high-frequency, wide-bandwidth, and multi-band networking.

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