A three-mode dielectric waveguide triode

By introducing quasi-TEM modes and hybrid cross-coupling topologies into ceramic waveguide resonant cavities, the problems of wideband coverage and high out-of-band suppression in miniaturization of multiplexed devices are solved, realizing the integration and cost reduction of three-mode dielectric waveguide triodes.

CN224458546UActive Publication Date: 2026-07-03HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Filing Date
2025-06-26
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing multiplexing devices struggle to meet the requirements of wide bandwidth coverage and high out-of-band rejection while maintaining miniaturization, especially in scenarios where frequency bands are far apart and the bandwidth coverage is wide.

Method used

Quasi-TEM modes are introduced into traditional ceramic waveguide resonant cavities, and a hybrid cross-coupled topology is achieved in a single resonant cavity. By utilizing the tuning blind aperture and coupling blind aperture design of the common resonant cavity and the output resonant cavity, wide bandwidth coverage and high out-of-band suppression are realized.

Benefits of technology

This technology enables the miniaturization and integration of a three-mode dielectric waveguide triode, meeting the requirements for wide bandwidth coverage and high out-of-band suppression performance, while reducing device costs.

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Abstract

This invention belongs to the field of communication devices and discloses a three-mode dielectric waveguide triode, comprising: a common resonant cavity with a tuning blind hole on its upper end face and two tuning blind holes on its four sides; three output resonant cavities connected to the three sides of the common resonant cavity respectively through an inter-cavity coupling structure; in each output resonant cavity, a tuning blind hole is formed on its upper end face, two tuning blind holes and one coupling blind hole are formed on its four sides, and a coupling blind hole is formed on its lower end face; the inter-cavity coupling structure includes a coupling slot and a coupling blind hole, the coupling slot being a rectangular notch at the connection between the common resonant cavity and the output resonant cavity, and the coupling blind hole in the inter-cavity coupling structure being formed at the connection between the upper end face of the common resonant cavity and the output resonant cavity, and being collinear with the coupling slot. This invention's three-mode dielectric waveguide triode achieves a high bandwidth by introducing quasi-TEM modes into a traditional ceramic waveguide resonant cavity and by exciting signals in different frequency bands using different modes.
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