Cavity filters achieve a high Q factor mainly because their metallic resonant cavity structure can effectively store electromagnetic energy. Stable standing waves are formed inside the cavity, allowing energy to reflect and circulate multiple times, which reduces radiation loss and enhances energy storage capability—an essential basis for achieving high Q values.

Secondly, cavity filters are typically made from high-conductivity metals such as copper or silver, often with silver plating on the surface to reduce conductor loss. Lower conductor loss means less energy attenuation as signals propagate within the cavity, resulting in higher selectivity and lower insertion loss within the operating frequency band.

In addition, cavity filters usually have relatively large physical dimensions and rigid structures, leading to uniform electric field distribution and low dielectric loss. This low-loss and highly stable structure enables cavity filters to maintain high Q factors even in high-power and high-frequency applications, such as communication base stations and RF systems.

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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