Single-Cavity Resonance Unit for High-Q Dielectric Filter
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Solution Overview
Problem
Traditional dielectric filters suffer from high power consumption due to the resistance effect of the electric field, resulting in a lower quality factor (Q value) despite their smaller size and higher performance.
Innovation Solution
A single-cavity resonance unit is designed with a first dielectric body of higher dielectric constant than a second dielectric body, forming dual-mode resonance and reducing the resistance effect by concentrating the electric field in the first dielectric body, while a metal casing covers the outer surface of the second dielectric body, and coupling windows facilitate resonance coupling between units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional dielectric filter adopts a single cavity and single dielectric material structure, then the dielectric constant is improved and operating frequency is achieved by smaller volume, but the resistance effect of the electric field increases causing high power consumption and lower Q value
Solution Approach 1:
The single dielectric body is segmented into two distinct dielectric bodies with different dielectric constants. The first dielectric body has a higher dielectric constant and contains the electric field, while the second dielectric body has a lower dielectric constant and reduces resistance effect. This segmentation allows the filter to maintain small volume through high dielectric constant material while reducing power consumption by isolating the electric field from lossy materials.
Solution Approach 2:
Different regions of the filter are assigned different dielectric properties to optimize local functions. The first dielectric body (higher dielectric constant) is positioned where electric field concentration is needed for miniaturization, while the second dielectric body (lower dielectric constant) is positioned to minimize resistance effects and power loss. This local differentiation of material properties resolves the contradiction between small size and low power consumption.
2Device complexity
If a traditional dielectric filter uses single dielectric material, then the structure is simple, but the quality factor (Q value) is lower due to electric field resistance effect
Solution Approach 1:
The filter employs a composite structure with two different dielectric materials having distinct dielectric constants. This composite approach allows optimization of the Q value by selecting materials with complementary properties: one material provides high dielectric constant for compactness while the other provides low loss characteristics. The composite material strategy maintains reasonable structural complexity while significantly improving the quality factor.
3Device complexity
If the electric field is distributed throughout the cavity, then the resonance mode is simple, but the resistance effect increases causing higher power consumption
Solution Approach 1:
The electric field is extracted and concentrated into the first dielectric body with higher dielectric constant, separating it from the second dielectric body that causes resistance effects. By taking out the electric field from the lossy region and confining it to the high-dielectric-constant region, the design achieves reduced power consumption while maintaining a relatively simple resonance mode structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the quality factor (Q value) of the filter, enabling miniaturization and high performance with reduced resonance loss, effectively suppressing interference signals in low-frequency bands.
Implementation Method 1
A dielectric resonance unit shortens electromagnetic waves passing through by means a dielectric material therein, and thus achieves microwave resonance
Implementation Method 2
concentrating the electric field in the first dielectric body
Implementation Method 3
reducing the resistance effect by concentrating the electric field in the first dielectric body
Implementation Method 4
a metal casing covering an outer surface of the second dielectric body
Implementation Method 5
a metal casing of each single-cavity resonance unit is provided with a coupling window used for carrying out resonance coupling with other single-cavity resonance units
Data Source
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AI summary
Provided in the present application are a single-cavity resonance unit and a filter. The single-cavity resonance unit comprises a first dielectric body, a second dielectric body and a metal casing covering the outer surface of the second dielectric body; wherein the second dielectric body is of a cavity structure; the first dielectric body is located inside the cavity of the second dielectric body; and the dielectric constant of the first dielectric body is higher than the dielectric constant of a second dielectric resonant cavity, and the shape of the first dielectric body in a first direction is reciprocal to the shape thereof in a second direction, thereby forming dual-mode resonance. The filter comprises a plurality of the single-cavity resonance units arranged in cascade, the metal casing of each single-cavity resonance unit is provided with a coupling window used for carrying out resonance coupling with other single-cavity resonance units.