Waveguide feed-based triplexer with common three-mode resonant cavity

Abstract

The invention discloses a waveguide feed-based triplexer with a common three-mode resonant cavity. The waveguide feed-based triplexer comprises the three-mode resonant cavity, a first single-mode resonant cavity, a second single-mode resonant cavity, a third single-mode resonant cavity, a first waveguide, a second waveguide, a third waveguide and a fourth waveguide, wherein the top part, the right part and the left part of the three-mode resonant cavity are coupled to the first single-mode resonant cavity, the second single-mode resonant cavity and the third single-mode resonant cavity through gaps respectively and the bottom part of the three-mode resonant cavity is coupled to the first waveguide through a gap; and the top part of the first single-mode resonant cavity is coupled to the second waveguide through a gap, the right part of the second single-mode resonant cavity is coupled to the third waveguide through a gap and the left part of the third single-mode resonant cavity is coupled to the fourth waveguide through a gap. The waveguide feed-based triplexer has the characteristics of being high in selectivity, high in Q value and simple in design and processing, and can meet the requirements of miniaturization communications.

Description

technical field [0001] The invention relates to a triplexer, in particular to a triplexer based on waveguide feeding and sharing a three-mode resonant cavity, belonging to the field of wireless communication. 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. [0003] As one of the branches, the cavity filter adopts the cavity structure. A cavity can be equivalent to an inductance in parallel with a capacitor, thus forming a resonant stage to achieve the filtering function. The Q va...

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Problems solved by technology

[0008] 4) In January 2004, L.H.Chua et al. published an article titled "Analysis of dielectric loadedcubical cavity for triplemode filter design", proposing to use the coaxial cable as the 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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