A frequency tuning device, filter, and duplexer

Abstract

The invention discloses a frequency tuning device, a filter and a duplexer. It includes a cavity and a cover plate, and a multimode medium and a shrapnel are arranged at intervals in the cavity, the multimode medium includes a horizontal end surface parallel to the cover plate and at least one vertical end surface perpendicular to the horizontal end surface, the The elastic piece includes an adjustment section arranged opposite to the vertical end surface, and a certain angle is formed between the plane formed by the top edge and the bottom edge of the adjustment section and a straight line parallel to the vertical end surface, and the cavity or cover plate A height-adjustable screw rod is provided, and the screw rod cooperates with the shrapnel, and the size of the included angle can be adjusted by adjusting the height of the screw rod. The patent of the present invention arranges shrapnel in the cavity, and realizes frequency adjustment by changing the angle between the shrapnel and the end surface of the medium, and changes the existing multiple axial adjustment methods into a single-direction adjustment method, which has simple structure, low cost, and high frequency. The advantages of good adjustment linearity, strong independence between frequencies, and large frequency adjustment range.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a frequency tuning device, a filter and a duplexer. Background technique [0002] The current multi-mode dielectric structures generally used in dielectric resonators, filters, etc. are: dual-mode Z-axis and X-axis or Z-axis and Y-axis or three-mode Z-axis and X-axis and Y-axis. When adjusting the frequency, It is realized by setting an axial adjusting screw to adjust the distance between the multi-axis (dimensional) debugging screw and the axial end face; or setting a screw parallel to the axial end face and adjusting the depth of the screw relative to the axial end face. The current frequency regulation structure and method have the following problems: [0003] 1. The debugging screw used to adjust the frequency is set perpendicular to each side wall of the cavity. For a single cavity, it occupies a large volume, which is inconvenient for manufacturing and hi...

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Problems solved by technology

[0003] 1. The debugging screw used to adjust the frequency is set perpendicular to each side wall of the cavity. For a single cavity, it occupies a large volume, which is inconvenient for manufacturing and high in cost; for the structure of a multi-channel multi-mode dielectric filter, The multi-faceted debugging screw will occupy the cavity travel path, which limits the cavity travel form between multiple cavities, and the structure is complex, making frequency debugging difficult

[0004] 2. Multi-axis debugging When the distance between the screw and the axial end face is changed, the frequency between them will be affected. For example, when the frequency of the X-axis is adjusted, the frequency of the Z-axis perpendicular to it will also change, and the independence is poor.

[0005] 3. When multi-axis debugging changes the distance between the screw and the axial end face, the change of the frequency is irregular. Even if the distance changes uniformly, when the distance is adjusted to a certain distance, the frequency will increase or decrease instantaneously, that is, the frequency of the current adjustment structure The adjustment linearity is poor, and it is not easy to control the frequency

[0006] 4. Change the depth of the screw relative to the axial end surface, the frequency adjustment range is small, and the applicability is poor

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