Dielectric Filter Resonators with Blind Holes for Capacitive Coupling
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Solution Overview
Problem
Solid dielectric filters face difficulties in implementing capacitive coupling due to the challenges of adjusting coupling degrees within solid media, making it hard to achieve efficient miniaturization without compromising performance in radio frequency filters for wireless communications base stations.
Innovation Solution
A dielectric filter design incorporating blind holes on the surface of dielectric resonators for adjusting resonance frequencies and implementing capacitive coupling, with a conducting layer covering the holes to facilitate capacitive coupling between resonators, allowing for easier manufacturing and adjustment of coupling degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the volume of a metal coaxial cavity filter is reduced, then the filter size becomes smaller, but the surface current increases, loss increases, and power bearing capability decreases
Solution Approach 1:
The patent replaces the traditional metal coaxial cavity structure with a dielectric resonator structure. The dielectric resonator uses electromagnetic resonance in a dielectric material instead of mechanical metal cavity resonance, allowing for smaller volume without the same surface current and loss problems that plague miniaturized metal cavities.
Solution Approach 2:
The patent changes the fundamental operating parameters by using dielectric materials with high permittivity to achieve resonance at smaller physical dimensions. By adjusting the dielectric constant and resonator geometry, the filter achieves compact size while maintaining acceptable loss characteristics through the different resonance mechanism.
2Volume of moving object
If the volume of a metal coaxial cavity filter is reduced, then the filter size becomes smaller, but the power bearing capability decreases
Solution Approach 1:
The patent substitutes the metal cavity resonance mechanism with dielectric resonator electromagnetic resonance. This fundamental mechanism change allows the filter to achieve miniaturization without the proportional degradation in power handling that occurs in metal cavities, as the dielectric resonator distributes electromagnetic energy differently within the structure.
Solution Approach 2:
The patent employs composite structures combining dielectric resonators with metallic components (such as metallic coupling structures or housing). This composite approach allows the dielectric resonator to provide compact resonance while metallic elements provide robust power handling and current pathways, achieving both miniaturization and maintained power capability.
3Volume of moving object
If a solid dielectric resonator is used with metalized surface, then miniaturization is achieved, but implementing capacitive coupling becomes difficult
Solution Approach 1:
The patent segments the capacitive coupling structure into discrete elements such as coupling holes or slots in the ground plane, and separate coupling capacitors or capacitive structures. This segmentation makes the capacitive coupling easier to manufacture and adjust in solid dielectric filters, as each element can be independently fabricated and positioned without requiring complex internal modifications to the solid dielectric resonator itself.
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
This design simplifies the manufacturing of capacitive coupling structures and allows for effective adjustment of coupling degrees, enhancing the performance of dielectric filters by enabling better miniaturization without compromising power capacity or near-end suppression capabilities.
Implementation Method 1
each of the dielectric resonators includes a body made of a solid dielectric material, and an adjusting hole located on a surface of the body, the adjusting hole is a blind hole, configured to adjust a resonance frequency of the dielectric resonator
Implementation Method 2
The negative coupling hole is a blind hole, configured to implement capacitive coupling between the two dielectric resonators. A conducting layer covering the surface of the body of the dielectric filter, a surface of the adjusting hole, and a surface of the negative coupling hole.
Implementation Method 3
each of the dielectric resonators includes a body made of a solid dielectric material
Data Source
AI summary
Embodiments relate to the field of technologies of components of communications devices, and provide a dielectric filter, which resolves a problem that a solid dielectric filter has a difficulty in implementing capacitive coupling. The dielectric filter includes at least two dielectric resonators, where each of the dielectric resonators includes a body made of a solid dielectric material, and an adjusting hole located on a surface of the body. The adjusting hole is a blind hole, configured to adjust a resonance frequency of the dielectric resonator on which the blind hole is located. The bodies of all the dielectric resonators included by the dielectric filter form a body of the dielectric filter.