Dielectric Resonator Duplexer with Misaligned Axis
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Solution Overview
Problem
Existing duplexer technologies face challenges in processing and production due to complex ceramic body shapes and high production costs, particularly in separating degenerate modes and achieving precise corner cutting in subminiature band-pass filters.
Innovation Solution
A duplexer design that shifts the dielectric resonator relative to the cavity's central axis, eliminating the need for slotted structures and simplifying processing, while using a coaxial connecting bar and tuning screws to achieve mode separation and bandwidth control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a subminiature band-pass filter uses triple-mode electroplated ceramic resonators with complex corner cutting and slot structures to separate degenerate modes, then mode separation and bandwidth control are achieved, but processing difficulty increases and production costs rise
Solution Approach 1:
The patent extracts the degenerate modes from the resonator by introducing irises that couple adjacent resonant cavities. This separation allows independent control of different modes without requiring complex corner cutting or slot structures, thereby achieving mode separation while simplifying manufacturing.
Solution Approach 2:
The patent introduces irises as intermediary coupling elements between adjacent resonant cavities. These irises serve as mediators to couple the cavities and separate the degenerate modes, providing a simpler alternative to complex corner cutting and slot structures while maintaining precise mode separation and bandwidth control.
2Reliability
If a duplexer uses slotted structures and complex ceramic body shapes to achieve mode separation, then filter performance is improved, but production costs and manufacturing difficulty increase
Solution Approach 1:
The patent segments the resonator into multiple adjacent resonant cavities that are coupled through irises. This segmentation allows independent design and optimization of each cavity, simplifying the overall structure while maintaining high filter performance through controlled coupling between segments.
Solution Approach 2:
The irises serve as intermediary coupling elements between the segmented resonant cavities. These intermediaries provide controlled coupling that achieves mode separation and bandwidth control without requiring complex slotted structures or irregular ceramic body shapes, thereby reducing device complexity while maintaining reliability.
3Manufacturing precision
If corner cutting precision is increased to achieve accurate mode separation in subminiature filters, then manufacturing precision is improved, but production time and costs increase
Solution Approach 1:
The patent extracts the mode separation function from complex corner cutting operations and implements it through iris coupling between cavities. This extraction eliminates the need for precise corner cutting while maintaining accurate mode separation, thereby improving production efficiency without sacrificing manufacturing precision.
Solution Approach 2:
The irises serve as intermediary elements that provide controlled coupling between cavities, replacing the need for precise corner cutting. This intermediary approach achieves accurate mode separation through standardized iris dimensions rather than complex geometric cutting, significantly improving productivity while maintaining manufacturing precision.
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 facilitates low-cost, efficient processing and production by simplifying the duplexer structure, achieving effective mode separation and bandwidth control, and reducing manufacturing difficulties, while maintaining high selectivity and Q value performance.
Implementation Method 1
The dielectric resonator is formed by repetitive total reflection and resonance of an electromagnetic wave inside a dielectric
Implementation Method 2
The dielectric resonator is formed by repetitive total reflection and resonance of an electromagnetic wave inside a dielectric
Implementation Method 3
The input port is connected to an input-end coupling plate disposed opposite to the dielectric resonator, the output port is connected to an output-end coupling plate disposed opposite to the dielectric resonator
Data Source
AI summary
The present disclosure is applicable to the field of communications device technologies is directed to a duplexer and a communications system having the duplexer. The duplexer includes a body, where an input port and an output port are disposed on the body, a cavity is disposed on the body, a dielectric resonator is disposed in the cavity, the input port is connected to an input-end coupling plate disposed opposite to the dielectric resonator, the output port is connected to an output-end coupling plate disposed opposite to the dielectric resonator, a tuning screw is connected to the body, and a central axis of the dielectric resonator misaligns with a central axis of the cavity. The communications system includes the duplexer.