Waveguide Filter Coupling Window for Negative Cross-Coupling
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Solution Overview
Problem
Conventional waveguide filters face challenges in generating negative coupling due to complex structures and low structural flexibility, making assembly and fixation difficult, especially with metal probe and microband line structures which require additional components and increase product complexity.
Innovation Solution
A waveguide filter design featuring a coupling window on a contact surface between resonators, where the total window length is equal to or greater than half a working wavelength, allowing for negative coupling by reversing coupling polarity and enabling a flexible topology with a simple structure suitable for various orders and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal probe structure is used to generate negative coupling, then negative cross coupling can be achieved, but assembly and fixation become difficult due to substrate punching and probe insertion requirements
Solution Approach 1:
The patent merges the coupling structure directly into the substrate block by forming conductive patterns on the substrate surface that extend into coupling windows. This integration eliminates the need for separate metal probes and substrate punching operations, making the structure self-contained and easier to assemble while maintaining negative coupling capability.
Solution Approach 2:
The patent extracts the metal probe component entirely from the design. Instead of using separate probes that need to be inserted and fixed, the coupling function is achieved through conductive patterns formed directly on the substrate block surface, eliminating the problematic insertion and fixation steps.
2Reliability
If external microband lines structure is used to generate negative coupling, then negative cross coupling can be achieved, but the number of components increases making assembly and fixation cumbersome
Solution Approach 1:
The patent merges the microband line coupling structure with the substrate block itself. Conductive patterns are formed directly on the substrate surface within coupling windows, eliminating the need for separate external microband line components and their associated mounting hardware, thus reducing overall device complexity.
Solution Approach 2:
The substrate block serves multiple functions: it provides mechanical support, contains the resonant cavities, and incorporates the coupling structures through surface conductive patterns. This multi-functionality eliminates the need for separate coupling components, reducing the total number of parts.
3Reliability
If metal probe structure in coaxial cavity filter is used to generate negative coupling, then negative cross coupling can be achieved, but a separate substrate is required making assembly complicated
Solution Approach 1:
The patent merges the coupling function into the substrate block by forming conductive patterns on its surface. This eliminates the need for a separate substrate to support metal probes, as the substrate block itself becomes the supporting structure with integrated coupling capability, simplifying the overall assembly.
4Reliability
If conventional waveguide filter structure is used, then filter function can be achieved, but structural flexibility is low making filter operation difficult
Solution Approach 1:
The patent introduces adjustable coupling windows with variable dimensions and positions on the substrate block surfaces. These coupling windows can be adjusted to change the coupling strength and characteristics between resonant cavities, providing dynamic control over filter operation while maintaining the basic filter function.
Solution Approach 2:
The patent enables structural flexibility by allowing changes in coupling window parameters (size, position, shape) to adjust filter characteristics. This provides adaptability in filter operation without compromising the fundamental filtering function, as the coupling parameters can be optimized for different operational requirements.
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 waveguide filter effectively generates negative coupling, offering a flexible and simplified structure for efficient assembly and operation, with the conductive layer facilitating connection and fixation through welding.
Implementation Method 1
a coupling window provided on a contact surface between the plurality of resonators, the coupling window exposing the substrate block for coupling of the plurality of resonators
Implementation Method 2
the conductive layer facilitating connection and may be fixed by welding
Data Source
AI summary
A waveguide filter including a coupling window for generating negative coupling includes: a plurality of resonators including a substrate block; and the coupling window provided between the plurality of resonators for coupling, wherein a length of a dimension element of the coupling window is equal to or greater than half a working wavelength of the waveguide filter. The waveguide filter may reverse a coupling polarity between resonators to generate negative coupling.