A filter for improving harmonics composed of a mixed cavity and a mixed mode

Abstract

The invention discloses a filter composed of a mixed cavity and a mixed mode for improving harmonic waves, comprising a cavity and a cover plate; a plurality of resonators are arranged in the cavity,the resonator is composed of a resonant cavity or a resonant rod arranged in the resonant cavity, at least two dielectric resonators are included in the plurality of resonators, the modes of differentdielectric resonators are freely combined to form a mixed mode, the parameters of the dielectric resonator comprise the size, the dielectric constant and the resonance structure, and one parameter ofat least one dielectric resonator of the plurality of dielectric resonators is different from the parameters corresponding to other dielectric resonators. A combined design of the resonator of mixedcavities and mixed modes of different types is adopted, thereby effectively improving the out-of-band rejection and far-end harmonic waves of the filter composed of the mixed cavity and the mixed mode, the advantages of being simple in structure, low in manufacture cost, convenient to use, reliable in performance and the like are achieved while the performance of the filter is remarkably improved,and meanwhile, the defects of volume and insertion loss caused by using the low pass are overcome.

Description

technical field [0001] The invention belongs to the technical field of wireless network communication, and in particular relates to a filter for improving harmonics composed of a mixing cavity and a mixing mode. Background technique [0002] Microwave passive devices are an extremely important part of modern microwave and millimeter wave communication systems, and microwave filters are one of the indispensable devices in these microwave passive devices. With the rapid development of communications and the increasing availability of radio spectrum resources Tension puts forward higher requirements on the performance index of passive filters, lower insertion loss requirements, smaller volume requirements, and higher performance requirements. A new type of functional ceramic material has emerged in recent years, which has the characteristics of high dielectric constant, high Q, and low temperature bias, and is used in passive filters. However, the use of dielectrics will bring...

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Problems solved by technology

However, the use of dielectric will bring a new problem. The harmonics are much worse than those of metal cavities. How to meet higher frequency selectivity and out-of-band suppression characteristics is a challenge for dielectrics.

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