Dielectric Resonator Coupling Holes for Low-Loss Out-of-Band Suppression
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Solution Overview
Problem
Current dielectric filters face challenges in achieving both low insertion loss and large out-band suppression due to difficulties in implementing negative coupling between resonators, which are either complex to tune or result in fragile structures that fail vibration and drop tests.
Innovation Solution
A resonating structure with negative coupling holes (tuning wells) on opposite surfaces of resonators, adjusted by depth, distance, and defect portions, allowing easy tuning of coupling strength without additional metal parts, enhancing stability and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If more cascaded resonators are used to achieve large out-band suppression, then out-band suppression is improved, but insertion loss increases and filter size increases
Solution Approach 1:
The patent introduces a 'zero point' frequency parameter in the transmission function to achieve out-band suppression without increasing the number of resonators. By carefully designing the coupling between resonators to create this zero point, the filter achieves strong out-band suppression while maintaining low insertion loss with fewer resonators.
Solution Approach 2:
The patent uses an intermediary coupling mechanism between resonators that enables both positive and negative coupling. This intermediary coupling design allows the system to achieve the desired transmission characteristics with fewer resonators, thereby reducing insertion loss while maintaining out-band suppression performance.
2Adaptability or versatility
If negative coupling is achieved by arranging a metal part between adjacent resonators, then negative coupling is achieved, but the implementation becomes complex and difficult to tune
Solution Approach 1:
The patent extracts the metal part from the coupling mechanism and replaces it with a direct dielectric coupling structure. By removing the metal intermediary, the design achieves negative coupling through the dielectric material itself, significantly simplifying the implementation and making it easier to tune by adjusting resonator positions and orientations.
Solution Approach 2:
The patent replaces the mechanical metal part coupling system with a dielectric-based coupling mechanism. This substitution eliminates the need for complex metal component arrangements and enables simpler tuning through direct adjustment of resonator spacing and orientation in the dielectric medium.
3Adaptability or versatility
If a blind hole is dug deeply to achieve required negative coupling, then negative coupling is achieved, but the dielectric filter becomes fragile and fails vibration and drop tests
Solution Approach 1:
The patent achieves the required negative coupling strength without digging excessively deep blind holes. By optimizing the coupling mechanism through resonator positioning and orientation, the system obtains sufficient negative coupling with shallower holes, thereby maintaining structural integrity and passing vibration and drop tests.
Solution Approach 2:
The patent changes the coupling parameters by adjusting resonator positions, orientations, and spacing rather than relying on deep blind holes. This parameter optimization achieves the necessary negative coupling while keeping the blind holes shallow, ensuring the filter meets robustness requirements for vibration and drop tests.
4Adaptability or versatility
If conventional methods are used to achieve negative coupling, then negative coupling is achieved, but the position of the zero point cannot be adjusted conveniently
Solution Approach 1:
The patent creates a dynamic and adjustable coupling system where the zero point position can be conveniently tuned. By designing the coupling mechanism to allow easy adjustment of resonator positions and orientations, the system enables flexible control over the zero point location in the frequency spectrum, enhancing adaptability for different filter design requirements.
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
Enables easy tuning of negative coupling for improved out-band suppression and reduced insertion loss, ensuring robustness and cost-effectiveness in dielectric filters.
Implementation Method 1
dielectric filters that use materials with a high dielectric constant as transmission media
Implementation Method 2
materials with a high dielectric constant as transmission media
Implementation Method 3
negative coupling (also known as 'capacitive coupling')
Data Source
Figure 1A~1B
Figure 1C~3A
Figure 3B~3D
AI summary
A resonating structure and a dielectric filter having the same are disclosed. According to an embodiment, the resonating structure comprises a body, at least one set of negative coupling holes, and a conductive material layer. The body is made of a solid dielectric material and comprises at least two resonators. The at least one set of negative coupling holes are formed at a connection between two adjacent resonators. Each set of negative coupling holes comprises a first blind hole and a second blind hole disposed on two opposite surfaces of the body respectively. The first blind hole and the second blind hole are offset from each other in a plane perpendicular to a direction along which the first or second blind hole is dug. The conductive material layer covers surfaces of the body and surfaces of the first blind hole and the second blind hole. A transceiver having the dielectric filter and a base station having the transceiver are also disclosed.