Multi-mode Resonant Filter Using Orthogonal Transmission Lines
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Solution Overview
Problem
Conventional high-frequency filters using Dielectric Resonators (DR) require multiple cavities and DR elements to achieve multi-mode resonant frequencies, leading to increased size, weight, and manufacturing complexity, making them costly and difficult to produce efficiently.
Innovation Solution
A multi-mode resonant filter design utilizing a single cavity and DR element within a housing, where three transmission lines are aligned orthogonally to create multiple resonant modes, allowing for direct connection or coupling between them, thereby reducing the number of components and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cavities and DR elements are used to achieve multi-mode resonant frequencies, then the filtering performance is improved, but the size, weight, and manufacturing complexity increase
Solution Approach 1:
The patent merges multiple resonant modes into a single cavity by introducing diagonal transmission lines that couple different resonant modes (TE101, TE011, TE110) within one DR element. This eliminates the need for multiple separate cavities and DR elements while maintaining multi-mode filtering performance, directly resolving the contradiction between filtering performance and device complexity
Solution Approach 2:
The single DR element in the patent serves multiple functions by supporting multiple resonant modes simultaneously through the diagonal transmission line coupling. Each transmission line orientation (x, y, z diagonals) excites different resonant modes, allowing one component to perform the work of multiple components, thereby reducing overall device complexity while maintaining filtering effectiveness
2Reliability
If multiple cavities and coupling means are used to create multi-mode BPF, then the resonant frequencies are achieved, but the space requirement increases leading to larger size and weight
Solution Approach 1:
The patent introduces diagonal transmission lines oriented along x, y, and z diagonals within the single cavity, utilizing three-dimensional spatial arrangement to excite different resonant modes. This dimensional approach allows multiple resonant frequencies to be achieved within the same physical volume, eliminating the need for multiple cavities and significantly reducing the overall filter size and weight
3Adaptability or versatility
If the number of cavities and DR elements is increased, then more resonant modes are achieved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple resonant mode generation functions into a single DR element within one cavity, using diagonally oriented transmission lines to excite different modes. This merging approach reduces the total number of components that need to be manufactured, assembled, and tuned, thereby lowering manufacturing costs while maintaining the capability to achieve multiple resonant modes
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 enables the creation of multiple resonant modes with a single DR element and cavity, reducing the size, weight, and manufacturing costs of the filter while maintaining effective filtering characteristics, and allowing for easier adjustment of notch positions and coupling values.
Implementation Method 1
a Dielectric Resonant (DR) element received in the housing, and forming a plurality of resonant modes in different directions
Implementation Method 2
a Dielectric Resonant (DR) element received in the housing
Implementation Method 3
a first transmission line aligned along a first direction in which a first resonant mode among the plurality of resonant modes is formed... the first transmission line, the second transmission line, and the third transmission line couple the first resonant mode, the second resonant mode, and the third resonant mode with each other
Data Source
AI summary
Various multi-mode resonant filters including a housing having a cavity, are provided. The multi-mode resonant filters include a Dielectric Resonant (DR) element received in the cavity of the housing, and a plurality of transmission lines for connecting a point on one of a first axis, a second axis, and a third axis with a point on another axis. The first axis, the second axis, and the third axis are orthogonal to each other with respect to a center of the DR element.