One-chamber multi-mode metal cylinder chamber filter

Abstract

The invention discloses a one-chamber multi-mode metal cylinder chamber filter. The one-chamber multi-mode metal cylinder chamber filter comprises a cylindrical chamber, two end covers, at least one metal rod and two feed units, wherein two ends of the cylindrical chamber are openings and are sealed by utilizing the end covers, the end covers and the openings are correspondingly matched in shapes and sizes, the two feed units are respectively mounted on the two end covers of the cylindrical chamber, and the metal rod is arranged on the cylindrical chamber and is perpendicularly connected with a side wall of the cylindrical chamber. According to the one-chamber multi-mode metal cylinder chamber filter, the multi-mode concept is utilized, the fractional bandwidth of the filter is relatively wide, the metal rod is added to the wall of the metal resonance chamber for perturbation, the multi-mode filter with transmission zeros is realized, and the filter has advantages of small volume, simple structure and easy processing, has a wide application scope and can excellently satisfy requirements of modern communication systems.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a single-cavity multi-mode metal cylindrical cavity filter. Background technique [0002] Microwave filter is an indispensable device in the transmitting and receiving ends of modern communication systems. It separates signals, allowing useful signals to pass through without attenuation as much as possible, and suppressing useless signals from passing through with as much attenuation as possible. With the development of wireless communication technology, the frequency band between signals becomes narrower and narrower, which puts forward higher requirements on the specification and reliability of filters. Rectangular cavity filters have high application value due to their high frequency selectivity, low insertion loss, large power capacity, and stable performance. The cavity filter achieves inductive or capacitive coupling by opening holes or adding probes between the cavity res...

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Problems solved by technology

The author proposes a three-mode structure using metal cavity chamfering, the structure is as follows Figure 5a As shown in , several resonant modes are shifted to our required passband by controlling the size of the cut angle. Its simulation results are as follows Figure 5b shown; the structure of this coupling method is not easy to process

[0007] 4) In January 2004, L.H.Chua et al published an article titled "Analysis of dielectric loaded cubic cavity for triple mode filter design", proposing to use coaxial cable as feed, such as Figure 6a As shown, the dielectric cavity filter structure using tuning screws, the simulation results are as follows Figure 6b As shown; the adjustable range of this structure using coupling screws is relatively small, and there are certain deficiencies

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