Cavity filter in-line cavity type symmetrical capacitor device

Abstract

The invention discloses a cavity filter in-line cavity type symmetrical capacitor device, which comprises a cavity and a harmonic oscillator which is located in the cavity and is of an in-line structure, wherein a strip-shaped capacitor piece which extends in parallel in the length direction of the cavity is arranged in the cavity, the strip-shaped capacitor piece comprises a first end and a second end, the first end is fixedly connected to a first fixed capacitor device receding structure through a screw, the first fixed capacitor device receding structure is fixedly connected with the inner bottom wall of the cavity, the first end is close to an input harmonic oscillator, the second end is fixedly connected with the inner side wall of the cavity through a second fixed capacitor device receding structure, the distance from the second end to a cover plate is 3.5 mm, and the distance from the second end to a resonance column is 3.2 mm. The cavity filter in-line cavity type symmetrical capacitor device has the beneficial effects that under the condition that a U-shaped cavity walking mode cannot be adopted due to space limitation, a zero point is generated on each of the left side and the right side of a passband in a straight-line cavity walking mode, and spurious signals on the left side and the right side of the passband are effectively restrained.

Description

technical field [0001] The invention relates to a cavity filter, in particular to a capacitor symmetrical cavity filter. Background technique [0002] Since 2020, 5G communication technology has been used more and more frequently in various fields; it is no longer just a conceptual guess and stay in the concept before; it is also applied to our actual life. And indicators also have higher requirements; because the actual frequency of 5G is high and sensitive; the transmission speed and output reading signal of the overall system have to meet the requirements of 5G frequency; Limitations, U-shaped cavity is usually used. If the size and space are limited, the conventional symmetrical capacitor device cannot be realized. Due to the limitation of index parameters, the product does not have the function of using straight-line cavity to achieve suppression, and U-shaped structure is required to add a step. Zero point to meet customer technical parameters; increase product dimens...

AI Technical Summary

Problems solved by technology

[0002] Since 2020, 5G communication technology has been used more and more frequently in various fields; it is no longer just a conceptual guess and stay in the concept before; it is also applied to our actual life. And indicators also have higher requirements; because the actual frequency of 5G is high and sensitive; the transmission speed and output reading signal of the overall system have to meet the requirements of 5G frequency; Limitations, U-shaped cavity is usually used. If the size and space are limited, the conventional symmetrical capacitor device cannot be realized. Due to the limitation of index parameters, the product does not have the function of using straight-line cavity to achieve suppression, and U-shaped structure is required to add a step. Zero point to meet customer technical parameters; increase product dimensions such as figure 1 As shown; through the Auto CAD software design for the traditional IQ structure, according to the point of the first port 1, the second port 2, the third port 3, to the fourth port 4 to achieve the passband waveform diagram, through the "U-shaped structure design" point In the waveform diagram, a symmetrical capacitor 5 can be added to the left and right sides of the passband to realize the adjustment of the symmetrical suppression strength on the left and right sides; because it needs to span two stages to realize the U-shaped zero-point structure, the normal size is the first size 6 and the second size 7 ; This design cannot meet the design requirements of the existing 5G direct discharge cavity structure in terms of external dimensions, and is not desirable in terms of cost and parameter indicators.

[0003] For example, Chinese Utility Model Patent Publication No. CN209963200U discloses a 400MHz filter, which includes a cavity with an SMA connector I on one side and an SMA connector II on the other side, a cover plate on the top of the cavity and The cover plate is connected to the side wall of the cavity through several screws and screws. Mounting holes are provided at the four corners of the cavity. Six resonant columns are arranged side by side inside the cavity and coupling steps are provided between adjacent resonant columns. There are taps between the resonant column at both ends and the SMA connector I and SMA connector II; the cavity is equipped with a flying rod and the flying rod is fixed on the inner wall of the cavity through a medium, but this structure still cannot meet the requirements of the passband. Each produces a zero demand

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