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A dual-mode dielectric resonator filter with metal patches

A dual-mode dielectric filter is proposed based on the frequency and coupling controlled by the metal patches. Three metal patches are pasted on the surface of a cylindrical dielectric resonator. Two of the three metal patches are used to turn the frequencies of two degenerate modes in the dielectric resonator independently, and another one is used to control the coupling between the two modes. From 1919MHz to 1981MHz, the return loss of the filter is greater than 20dB, and the insertion loss of the filter is less than 0.1dB. The out-of-band attenuation of the proposed filter at 1.8GHz and 2.1GHz are 74.2dB and 89dB respectively. The proposed dual-mode dielectric filter has a small size and high quality factor, and is easy to be fabricated.