The cavity in a cavity filter serves as its core structure, functioning mainly for resonance and energy storage. The cavity acts as a three-dimensional resonator, and its size and shape determine the resonant frequency, enabling selective transmission and suppression of specific frequency bands. When a signal enters the filter, electromagnetic waves at the target frequency generate standing-wave resonance within the cavity and pass through effectively, while non-target frequencies are significantly attenuated.

In addition, the cavity provides a high quality factor (Q), reducing insertion loss and improving selectivity and stability. Compared with traditional LC filters, cavity filters have lower energy leakage and stronger power-handling capability, making them especially suitable for high-frequency and high-power communication systems such as 5G base stations, satellite communications, and radar equipment.

In summary, the cavity primarily enables resonance, spurious suppression, high Q, and high power handling, making it a key element in ensuring the high performance of cavity 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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