Stacked high-Q dual-mode filter based on slot waveguide technology

Abstract

The invention relates to a stacked high-Q dual-mode filter based on a slot waveguide technology. The stacked high-Q dual-mode filter comprises a bottom metal plate, a middle metal plate and a top metal plate which are stacked and fixed up and down, and waveguide flanges are respectively fixed on the bottom metal plate and the top metal plate; a plurality of metal upright posts arranged in a surrounding manner are arranged on the bottom metal plate and the middle metal plate, and resonant cavities are formed by the metal upright posts which are arranged in a surrounding manner and the metal layer on the upper layer of the metal upright posts; an air gaps is formed between the metal upright post on each layer and the metal layer on the upper layer; the middle layer metal plate is provided with a slot which allows upper and lower resonant cavities to achieve electromagnetic energy coupling; the bottom metal plate and the top metal plate are both provided with elongated slots, and the waveguide flanges are provided with openings corresponding to the elongated slots. The stacked high-Q dual-mode filter achieves miniaturization of the filter through the stacked dual-mode design; the slotwaveguide technology is adopted for implementation, and the resonant cavity is filled with air, so that the high no-load quality factor is achieved.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a waveguide resonant cavity filter, in particular to a stacked high-Q dual-mode microwave filter based on slot waveguide technology. Background technique [0002] Due to the increasingly tight frequency spectrum and high data rate requirements of the communication system, the frequency of the communication system continues to expand to high frequencies. Low cost, miniaturization and other performances have become the inevitable requirements for millimeter wave devices. The design of dual-mode or multi-mode filters achieves higher filter order and better filtering performance with the same volume. Therefore, dual-mode or multi-mode design is of great significance to the miniaturization and low cost of filters. However, in the design of multimode filters, due to the complexity of the multimode intracavity mode control and the coupling between the intercavity modes, and the multim...

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Problems solved by technology

[0005] The patent of CN105762447 provides a dual-frequency differential filter. The dual-frequency differential filter is also a stacked filter, but this patent is actually a dual-frequency filter with an existing common SIW structure. The SIW structure The filter will introduce dielectric loss, which cannot be applied to millimeter waves or higher frequency bands; and the slit used to achieve coupling in this patent is designed to be parallel to the diagonal of the resonator, which cannot flexibly adjust the coupling coefficient. At the same time, the patent Flexible control of multi-mode intra-cavity mode and inter-cavity mode coupling cannot be achieved, and the design is complex, making it difficult for this type of filter to be widely used

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