Dielectric filters can be applied to millimeter-wave frequency bands, but this requires suitable materials and precise manufacturing processes. Millimeter-wave frequencies impose stricter demands on dielectric loss, dimensional stability, and fabrication accuracy. High-permittivity ceramic materials (such as dielectric resonators) can maintain a high Q-factor at high frequencies, enabling good performance in the millimeter-wave range.

      At the design level, dielectric filters become much smaller at millimeter-wave frequencies, resulting in more compact structures that support system miniaturization. However, because the wavelengths are very short, even tiny manufacturing deviations can cause significant frequency shifts. Therefore, high-precision fabrication—such as advanced ceramic sintering, LTCC technology, or precision machining—is essential.

      In practical applications, dielectric filters are already used in 24 GHz, 28 GHz, and 39 GHz millimeter-wave 5G systems, as well as automotive radar operating at 24/60/77 GHz, providing signal selection, interference suppression, and front-end optimization. Overall, dielectric filters can operate reliably in millimeter-wave bands as long as material loss and manufacturing accuracy meet the required standards.

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