Single-Layer Cross-Coupled Filter Layout for Low-Height Miniaturization
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Solution Overview
Problem
Existing filter technologies face challenges in miniaturization and cost reduction due to complex assembly processes and performance degradation in planar linear arrangement structures, particularly in achieving cross-coupling without increasing height and processing costs.
Innovation Solution
A single-layer cross-coupling filter design featuring integrally formed resonant structures with bending parts and a U-shaped or S-shaped signal transmission path, allowing for cross-coupling between non-adjacent resonators without additional structural parts, and fixed using screws, soldering, or welding, reducing assembly complexity and height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional structural parts (open-circuited or short-circuited components) are added to realize cross-coupling in planar linear arrangement, then cross-coupling function is achieved, but processing costs and assembly complexity increase
Solution Approach 1:
The patent combines the cross-coupling function directly into the resonant rods themselves through integral bending structures, merging the coupling function with the resonator structure. This eliminates the need for separate coupling components and reduces assembly complexity while maintaining cross-coupling functionality.
Solution Approach 2:
The resonant rods are designed with self-contained bending structures that automatically provide cross-coupling functionality. The integral design allows the resonators to serve their own coupling needs without requiring external structural parts, thereby simplifying the overall device structure and reducing assembly requirements.
2Adaptability or versatility
If additional structural parts are installed and bonded in insulator to fix cross-coupling structure, then cross-coupling is achieved, but processing and production costs increase
Solution Approach 1:
The patent integrates the cross-coupling structure directly into the resonant rods through integral bending designs, combining multiple functions into a single component. This eliminates the need for separate coupling structures and their associated insulator assemblies, thereby reducing processing and production costs.
Solution Approach 2:
The patent extracts and eliminates the unnecessary insulator and additional structural parts from the design. By using integral bending structures in the resonant rods themselves, the design removes the need for separate coupling components and their supporting insulator assemblies, simplifying manufacturing and reducing costs.
3Adaptability or versatility
If structural part is bent over certain length for short-circuited cross-coupling, then cross-coupling is achieved, but overall product height increases
Solution Approach 1:
The patent transitions from vertical bending structures that increase height to planar layout designs where cross-coupling is achieved through horizontal arrangement and integral bending within the same layer. This dimensional change allows cross-coupling functionality without increasing the overall product height.
Solution Approach 2:
The patent merges the cross-coupling structure with the resonant rod design in a planar configuration, eliminating the need for separate vertical coupling structures. The integral bending structures are incorporated within the same layer as the resonators, maintaining a compact overall height while achieving cross-coupling.
4Strength
If welding or bonding is used to fix structural part on resonator, then cross-coupling structure is secured, but filter performance degrades due to tolerance issues
Solution Approach 1:
The patent combines the resonant rod and coupling structure into a single integral component through techniques like injection molding. This merging eliminates the need for separate welding or bonding operations, thereby avoiding the tolerance issues and performance degradation associated with these joining methods.
Solution Approach 2:
The integral design allows the resonant rod to provide its own structural support and coupling function without requiring additional joining operations. The self-contained structure eliminates the need for external welding or bonding, ensuring consistent manufacturing precision and maintaining filter performance.
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 achieves miniaturization, reduces assembly time and costs, minimizes cumulative tolerance, and enhances design flexibility while maintaining filter performance by eliminating the need for additional conductors and simplifying the assembly process.
Implementation Method 1
a resonant structure (2) installed in the receiving space (11) of the cavity (1)... each row of the resonant units includes a plurality of resonators... The resonators on a same row are coupled and connected to form signal transmission
Implementation Method 2
The resonant structure (2) includes at least two rows of resonant units distributed along a signal transmission path... at least two adjacent resonators in different rows are coupled and connected to realize cross-coupling
Data Source
AI summary
A single-layer cross-coupling filter includes a cavity in which a receiving space is formed; an integrally formed resonant structure installed in the receiving space; and at least one partition wall. The resonant structure includes at least two rows of resonant units distributed along a signal transmission path. The at least two rows of resonant units are located in a same plane of the receiving space, and each row of the resonant units includes a plurality of resonators. The resonators on a same row are coupled and connected to form signal transmission, and at least two adjacent resonators in different rows are coupled and connected to realize cross-coupling.