Multi-Type Filter Assembly With Offset Windows for Notch Control
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Solution Overview
Problem
Existing technologies cannot effectively combine cavity filters and dielectric resonator filters, and require separate metal crossbars for enhancing skirt characteristics.
Innovation Solution
A multi-type filter assembly that integrates cavity and dielectric resonator filters by offsetting windows between cavities to adjust notch characteristics without additional metal crossbars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cavity filter and dielectric resonator filter are combined in a single filter assembly, then filter performance and skirt characteristics are improved, but the structural complexity and difficulty of integration increase
Solution Approach 1:
The patent combines cavity filter and dielectric resonator filter into a single integrated filter assembly, merging two different filter types to achieve improved filter performance and skirt characteristics while managing the structural complexity through unified design
Solution Approach 2:
The filter assembly is designed to perform multiple functions by integrating both cavity filter and dielectric resonator filter capabilities in one structure, allowing it to handle different frequency ranges and provide enhanced skirt characteristics simultaneously
2Reliability
If windows are offset from center positions to adjust notch characteristics, then the notch characteristics between cavity filter and dielectric resonator filter are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The windows are positioned at specific offset locations rather than center positions, creating local quality variations in the coupling between cavities. This intentional asymmetric positioning optimizes the notch characteristics by controlling the electromagnetic coupling at specific locations
Solution Approach 2:
The offset positioning of windows changes the geometric parameters of the cavity coupling structure. By adjusting the window positions from center to offset locations, the electromagnetic coupling characteristics and notch frequencies are tuned to achieve desired filter performance
3Reliability
If separate metal crossbars are used to strengthen skirt characteristics, then the attenuation in stop band is improved, but the device complexity and number of components increase
Solution Approach 1:
The patent merges the skirt enhancement function into the existing window structure of the filter assembly, eliminating the need for separate metal crossbars. The offset windows themselves provide the necessary coupling control to achieve strong attenuation characteristics in the stop band
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 combined use of cavity and dielectric resonator filters with desired skirt characteristics, eliminating the need for separate metal crossbars and enhancing filter performance.
Implementation Method 1
windows are designed to be offset from the center and positioned at different lateral locations relative to each other so that the notch characteristics between the cavity filter and the at least two dielectric resonator filters are adjusted by the windows that communicate with each other by cutting a part of a partition wall between the reference cavity and the adjacent cavity
Implementation Method 2
the dielectric resonator filter serves to filter an input frequency with a minimum loss by a unique high quality factor (Q) value to output only a desired frequency in a specific band to an output terminal
Data Source
AI summary
The present disclosure relates to a multi-type filter, and in particular, to a multi-type filter comprising: a cavity filter provided in any one (hereinafter, referred to as a “reference cavity”) among a plurality of cavities formed in a housing to be open to one side; and dielectric resonator filters respectively provided in at least two cavities adjacent to the reference cavity (hereinafter, referred to as “adjacent cavities”), wherein, to control the notch characteristics between the cavity filter and the at least two dielectric resonator filters according to windows formed by cutting of portions of partition walls between the reference cavity and the adjacent cavities to be in communication with each other, the windows are provided at different positions, which is advantageous in that the cross-coupling design is very easy without the need to include a metal crossbar and the like for separate notch formation.