Kilpatrick Townsend & Stockton LLP
Dual-mode monoblock dielectric filter and control elements
A dual-mode dielectric resonator using two dissimilar modes is described, the dissimilar modes supported by a ridge waveguide resonator and a ¼-wavelength (¼λ) metalized cylindrical resonator within a single, metal-coated dielectric block. Each ridge waveguide resonator and cylindrical resonator form a dual-mode resonator pair. Coupling control posts set between the ridge waveguide resonator and cylindrical resonator can adjust their coupling. Multiple pairs of ridge waveguide/cylindrical resonators are fabricated in the same dielectric block to form a coupled resonator bandpass filter, including an 8-pole or 10-pole dielectric resonator filter, for 5G or other applications. Transmission zeros can be introduced by a metalized blind hole extending vertically between two ridge waveguide resonators or a microstrip extending between two dual-mode resonator pairs between which there exists no partial-width or full-width dielectric window.
The Chinese University of Hong Kong
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Yuliang Yan Ke-Li
Chen Zhang Wu