High-Band Resonator Filter Layout Using Negative Coupling
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Solution Overview
Problem
Conventional approaches to achieving a stopband below the passband in RF combiners often result in increased mechanical complexity, higher costs, and sensitivity to mechanical tolerances due to the need for close coupling between resonators, which can be challenging to tune effectively.
Innovation Solution
The use of exclusively negative couplings between high-band resonators, achieved through specific shaping and topology, allows for a robust high-band channel filter with improved mechanical tolerance and reduced size and complexity, while maintaining effective stopband rejection and insertion losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional approaches are used to achieve stopband below passband, then stopband rejection is improved, but mechanical complexity increases
Solution Approach 1:
The patent changes the coupling parameter from mixed (inductive and capacitive) to exclusively capacitive coupling between resonators. This parameter change enables stopband rejection below the passband while avoiding the mechanical complexity of close inductive coupling, as capacitive coupling can be achieved through field interactions without requiring physically close resonator structures.
Solution Approach 2:
The patent replaces mechanical inductive coupling (which requires close physical proximity and precise mechanical alignment) with electromagnetic capacitive coupling. This substitution eliminates the need for tight mechanical tolerances and complex mechanical structures, achieving stopband rejection through field-based coupling instead of mechanical coupling.
2Reliability
If conventional approaches are used to achieve stopband below passband, then stopband rejection is improved, but cost increases
Solution Approach 1:
By changing the coupling mechanism to exclusively capacitive coupling, the patent simplifies the manufacturing process. Capacitive coupling structures are generally easier and less costly to manufacture than inductive coupling structures that require precise mechanical assembly, thereby reducing production costs while maintaining stopband rejection performance.
3Reliability
If conventional approaches are used to achieve stopband below passband, then stopband rejection is improved, but sensitivity to mechanical tolerances increases
Solution Approach 1:
The patent substitutes mechanical inductive coupling with electromagnetic capacitive coupling. Since capacitive coupling relies on electric field interactions rather than direct mechanical contact or precise physical alignment, the resulting structure is significantly less sensitive to mechanical tolerances and manufacturing variations, thereby improving robustness while maintaining stopband rejection.
4Reliability
If close coupling between resonators is used, then stopband rejection is improved, but tuning effectiveness decreases
Solution Approach 1:
The patent changes the coupling type from inductive to capacitive. Capacitive coupling allows for easier and more effective tuning because it can be adjusted through electrical means (such as variable capacitors or tuning screws) without requiring mechanical disassembly or repositioning of closely coupled resonators, thereby improving tuning effectiveness while maintaining stopband rejection.
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 approach enables a high-band channel filter with optimal performance, reduced sensitivity to mechanical tolerances, and lower insertion losses, while maintaining effective stopband rejection, by using only negative couplings between high-band resonators, which are arranged and shaped to provide capacitive couplings without inductive coupling.
Implementation Method 1
adjacent and non-adjacent ones of the high-band resonators are capacitively coupled to one another
Implementation Method 2
The high-band resonators are arranged and shaped to provide negative coupling between the resonators, which provides a stopband below a passband of the high-band channel filter
Implementation Method 3
a resonator filter comprising a group of coaxial resonators
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Filter devices are provided herein. A filter device includes a plurality of low-band resonators and a plurality of high-band resonators. In some embodiments, adjacent ones of the plurality of high-band resonators are spaced farther apart from each other than adjacent ones of the plurality of low-band resonators are spaced apart from each other.