Film filters are generally not suitable for high-power RF applications. Their strengths lie in miniaturization and high-frequency performance rather than power-handling capability.

      From a structural and material perspective, thin-film filters are based on microstrip or coplanar transmission lines, with very thin conductor and dielectric layers. This results in high current density and limited heat dissipation paths. Under high-power conditions, issues such as dielectric heating, metal migration, and power compression can occur, leading to increased insertion loss or even performance failure.

      In terms of applications, thin-film filters are better suited for low- to medium-power RF front ends, such as mobile communication devices, Wi-Fi, IoT, and millimeter-wave modules. For scenarios requiring high continuous or peak power (for example, at the output stage of base station power amplifiers), dielectric filters, cavity filters, or waveguide filters are typically preferred.

      Under specific conditions, thin-film filters can be used in limited-power applications through optimized metal thickness, substrate materials, and thermal design. Overall, however, their power-handling capability remains significantly lower than that of bulk resonator-based filters.

Yun Micro, as the professional manufacturer of rf passive components, can offer the cavity filters up 40GHz,which include band pass filter, low pass filter, high pass filter, band stop filter.

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