Dielectric loading adjustable filter with double-metal diaphragm structure

Abstract

The invention discloses a dielectric loading adjustable filter with a double-metal diaphragm structure. The filter comprises a first waveguide body, a second waveguide body, a first metal diaphragm, asecond metal diaphragm, an intermediate cavity block, a dielectric diaphragm and a driving device, and the first metal diaphragm is arranged between the first waveguide body and the middle cavity block; the second metal diaphragm is arranged between the second waveguide body and the middle cavity block, a second cavity is formed in the side, facing the second metal diaphragm, of the second waveguide body, the dielectric diaphragm is located in the second cavity, the dielectric diaphragm is connected with the driving device, and the driving device drives the dielectric diaphragm to move in thesecond cavity. According to the double-metal diaphragm filter,compared with a single metal diaphragm structure, in the process that the dielectric diaphragm moves to carry out frequency tuning, the change of the coupling coefficient of the filter is small, the absolute bandwidth of the filter can be kept almost unchanged in the tuning process, in-band standing wave deterioration in the tuning process is small, and finally good in-band and out-of-band performance is kept.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to designing a medium-loaded tunable filter with a bimetal diaphragm structure. Background technique [0002] In the field of communication, filters are widely used as a frequency selection device. With the development of wireless communication, in order to meet different application environments, different filter structures have emerged. In the 5G millimeter-wave backhaul frequency band, there are many sub-frequency bands. If an adjustable filter with good performance can be designed to cover all sub-bands of the required frequency band, and the filter can be adjusted within a certain frequency range, it will improve the performance of the filter. Platformization is beneficial to the unification of many different types of filters with passbands, and it is of great significance to reduce manufacturing costs and manual replacement costs. [0003] At present, the design of the tu...

AI Technical Summary

Problems solved by technology

[0005] However, the traditional E-plane filter with a single metal diaphragm structure still has shortcomings, that is, when its tuning range is wider, or when it is tuned to some special frequency points, the return loss in the band will deteriorate sharply. causing the filter function to fail

At the same time, in many E-plane tunable filters reported before, the movement of the dielectric sheet is along the length of the metal cavity. This method is easy to cause the dielectric sheet to break and break, which seriously affects the engineering of this type of filter. Practicality

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