Four-mode dielectric waveguide filter

Abstract

A four-mode dielectric waveguide filter disclosed by the present invention comprises a dielectric body with a conductive coating on the surface, the dielectric body can be divided into a plurality of resonant cavities, the top of at least one resonant cavity is provided with a four-mode structure, and the four-mode structure comprises four tuning blind holes and a coupling through hole, wherein two tuning blind holes are distributed near the transverse center line of the resonant cavity body, the other two tuning blind holes are distributed near the longitudinal center line of the resonant cavity body, and a coupling through hole is formed in the middle position of the resonant cavity body or close to the center of the resonant cavity body. The four-mode structure enables a TE101 mode, a TE201 mode, a TE102 mode and a TE202 mode to become four modes with the lowest frequency in the cavity, so that the four-mode filter is realized. Four modes are applied in one resonant cavity, the number of resonant cavities needed by the filter can be reduced, the size of the filter is further reduced, and the device miniaturization is achieved.

Description

technical field [0001] The invention relates to the technical field of radio frequency and microwave filters, in particular to a four-mode dielectric waveguide filter. Background technique [0002] In recent years, my country's 5G communication base station construction has been steadily advancing, and 5G base station filters have become a research hotspot. my country's 5G mainstream frequency band has 64 channels, and the required filters are 8 to 16 times that of 4G. Moreover, the filter has been integrated into the active unit of the antenna with a large-scale multiple-input multiple-output antenna, which puts forward higher requirements on the volume of the filter. Therefore, using multimode technology to miniaturize dielectric waveguide filters has extremely high application value. [0003] The existing multi-mode technology mainly has the following disadvantages: First, some multi-mode filters only use the most basic three modes of the waveguide cavity, and couple th...

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Problems solved by technology

[0003] The existing multi-mode technology mainly has the following disadvantages: First, some multi-mode filters only use the most basic three modes of the waveguide cavity, and couple through corner cutting. The size of this filter is relatively fixed, and the thickness of the dielectric block Too large, not conducive to the reduction of base station height

Second, some multimode dielectric waveguide filters use high-order modes, which will generate parasitic passbands in the low frequency band

Although some do not use high-order modules, they do not use extreme reduction, wasting a model

Third, the volume of some multi-mode cavities is equivalent to the volume of multiple single-mode cavities cascaded, which does not play a role in miniaturization

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