Cavity Filter Cross-Coupling Notch Substrate
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Solution Overview
Problem
Cavity type wireless frequency filters with cross-coupling notch structures face challenges in reducing size and weight while maintaining stable notch characteristics, requiring high precision in manufacturing which increases costs and reduces production yield due to tight machining tolerances.
Innovation Solution
A cavity type wireless frequency filter with a cross-coupling notch structure utilizing a notch substrate made of non-conductive material with conductive lines and coupling structures for non-contact signal transmission between resonant elements, simplifying manufacturing and stabilizing notch characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cross-coupling notch structure with metal rod and dielectric support is used, then notch characteristic can be formed, but manufacturing precision requirement increases and production yield decreases
Solution Approach 1:
The patent replaces the mechanical cross-coupling structure (metal rod with dielectric support passing through cavity walls) with an electromagnetic field-based coupling mechanism. The coupling is achieved through electromagnetic induction between resonant elements, eliminating the need for precise mechanical assemblies and through-hole machining while maintaining stable notch characteristics.
Solution Approach 2:
The patent introduces a coupling structure that mediates the interaction between resonant elements through electromagnetic fields rather than direct mechanical contact. This intermediary approach allows for relaxed manufacturing tolerances while maintaining the desired coupling effect for notch formation.
2Reliability
If the number of filter stages is increased to improve skirt characteristic, then skirt characteristic becomes better, but insertion loss increases
Solution Approach 1:
The patent extracts the notch formation function from the main filter signal path by using a separate coupling mechanism between resonant elements. This allows the notch to be formed through energy extraction at specific frequencies without requiring additional filter stages, thereby maintaining low insertion loss while achieving the desired skirt characteristic.
3Reliability
If cavity type filter structure is used, then high-frequency resonance can be generated, but device size and weight increase
Solution Approach 1:
The patent employs thin-walled cavity structures and streamlined housing designs that maintain the necessary resonant volumes for high-frequency operation while minimizing material usage. The optimized cavity geometry achieves the required electromagnetic performance with reduced weight and size.
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 solution enables a smaller, lighter filter with a simpler structure, improving manufacturing ease and stability of notch characteristics, thus overcoming the challenges of size reduction and high precision requirements.
Implementation Method 1
a conductive line implemented with a conductor pattern formed on the main substrate and transmitting a signal of a first resonant element among the at least two resonant elements to a second resonant element thereamong through a non-contact coupling method
Implementation Method 2
a dielectric resonant (DR) element or a resonant element made of a metal resonant rod is provided inside each of the plurality of cavities and thus a high-frequency resonance is generated
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present invention relates to a cavity type wireless frequency filter having a cross-coupling notch structure, the filter comprising a notch substrate provided for cross-coupling between at least two resonance elements among a plurality of resonance elements, wherein the notch substrate comprises: a main substrate, which is made of a non-conductive material and has the first and second coupling structures mechanically coupled with at least two resonance elements, respectively; and a conductive line which is implemented by a conductive pattern formed on the main substrate and transfers a signal of a first resonance element to a second resonance element by using a non-contact coupling method.