Multi-mode Cavity Filter Using Aperture Coupling
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Solution Overview
Problem
Conventional multi-mode filters for frequency division duplexers in telecommunication applications require complex shapes and additional defects or conductive tracks, leading to increased manufacturing costs and resistive losses, making them unsuitable for compact designs at antenna towers.
Innovation Solution
A multi-mode cavity filter design using two dielectric resonator bodies with a conductive layer and strategically placed apertures for simultaneous coupling of signals into and out of multiple modes, eliminating the need for defects and minimizing resistive losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If defects or conductive tracks are introduced into the resonator body to couple energy between modes, then multi-mode filtering can be achieved, but manufacturing complexity and resistive losses increase
Solution Approach 1:
The patent extracts the energy coupling function from the resonator body itself by removing defects/conductive tracks from the dielectric material. Instead, separate coupling resonators are used to transfer energy between modes, thereby eliminating the manufacturing complexity and resistive losses associated with introducing defects into the main resonator body.
Solution Approach 2:
The patent introduces separate coupling resonators as intermediary elements between the input/output ports and the resonant modes. These coupling resonators mediate the energy transfer without requiring defects in the main resonator body, thus achieving mode coupling while maintaining manufacturing simplicity and low resistive losses.
2Adaptability or versatility
If defects or conductive tracks are introduced into the resonator body to couple energy between modes, then multi-mode filtering can be achieved, but resistive losses increase
Solution Approach 1:
The patent extracts the energy coupling function from the resonator body itself by removing defects/conductive tracks from the dielectric material. Instead, separate coupling resonators are used to transfer energy between modes, thereby eliminating the manufacturing complexity and resistive losses associated with introducing defects into the main resonator body.
Solution Approach 2:
The patent introduces separate coupling resonators as intermediary elements between the input/output ports and the resonant modes. These coupling resonators mediate the energy transfer without requiring defects in the main resonator body, thus achieving mode coupling while maintaining manufacturing simplicity and low resistive losses.
3Manufacturing precision
If multiple discrete resonators are used to achieve filtering characteristics, then desired filter response can be obtained, but filter size increases
Solution Approach 1:
The patent merges multiple resonant modes into a single resonator body, allowing multiple filtering functions to be achieved within one compact structure. The coupling resonators enable energy transfer between these modes, effectively combining the functionality of multiple discrete resonators into a single integrated unit, thereby reducing overall filter size while maintaining desired filter response characteristics.
4Adaptability or versatility
If the resonator body is given a complicated shape to enable mode coupling, then multi-mode filtering is achieved, but manufacturing costs increase
Solution Approach 1:
The patent extracts the energy coupling function from the resonator body itself by removing defects/conductive tracks from the dielectric material. Instead, separate coupling resonators are used to transfer energy between modes, thereby eliminating the manufacturing complexity and resistive losses associated with introducing defects into the main resonator body.
Solution Approach 2:
The patent segments the filter into distinct functional components: main resonator bodies for storing energy in resonant modes, and separate coupling resonators for transferring energy between modes. This segmentation allows each component to have a simple, manufacturable shape while achieving complex multi-mode filtering functionality through their interactions.
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 design enables efficient signal filtering with reduced size and manufacturing complexity, achieving desired filter responses while maintaining low resistive losses, suitable for compact telecommunication equipment.
Implementation Method 1
the first dielectric resonator body incorporating a piece of dielectric material having a shape such that it can support at least a first resonant mode and at least a second substantially degenerate resonant mode
Implementation Method 2
at least one aperture in the layer or layers of conductive material appearing at the interface of the first dielectric resonator body and the second dielectric resonator body, for at least one of: transferring signals from the second dielectric resonator body to the first dielectric resonator body
Data Source
AI summary
A multi-mode cavity filter, including two dielectric resonator bodies, the first incorporating a piece of dielectric material having a shape to support a first resonant mode and a second substantially degenerate resonant mode; the second also including a piece of dielectric material; the piece of dielectric material having a shape to support a first resonant mode; a layer of conductive material in contact with and covering both of the dielectric resonator bodies; an aperture in the layer at the interface of the first and second dielectric resonator bodies, for transferring signals from the second dielectric resonator body to the first, transferring signals from the first dielectric resonator body to the second and/or outputting signals from the first dielectric resonator body, the aperture being arranged for coupling signals to the first and second resonant modes in parallel, and/or coupling signals from the first and second resonant modes in parallel.