Sheet-Shaped Cavity Filter Structure Without Flying Rods
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Solution Overview
Problem
Existing cavity filters require flying rods to generate transmission zeros on the low-frequency side of the passband, leading to increased materials, complex assembly, high costs, and poor consistency.
Innovation Solution
A cavity filter design that eliminates the need for flying rods by using sheet-shaped resonant rods with extension sections for capacitive coupling, along with a third resonant rod for symmetrical transmission zero generation, resulting in a simpler structure with improved stability and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flying rods are used to generate transmission zero on the low-frequency side, then the transmission zero can be achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the flying rod component from the cavity filter structure. Instead of using separate flying rods to couple adjacent resonant rods, the invention integrates the coupling function directly into the resonant rod structures themselves, thereby removing the problematic component that caused assembly complexity and consistency issues
Solution Approach 2:
The patent merges the function of the flying rod into the resonant rod structure. The extension sections of the resonant rods directly provide the capacitive coupling between adjacent cavities, combining what were previously separate components (resonant rod + flying rod) into a unified structure that simplifies manufacturing and assembly
2Reliability
If flying rods are used to generate transmission zero, then the low-frequency transmission zero can be achieved, but the manufacturing cost increases
Solution Approach 1:
By removing the flying rod component entirely, the patent eliminates the source of manufacturing inconsistency. The integrated resonant rod structure with extension sections can be manufactured as unified components, reducing the number of parts that need to be precisely fabricated and assembled, thereby lowering both material and labor costs
Solution Approach 2:
The patent changes the structural parameters of the resonant rods by adding extension sections that directly provide the coupling function. This parameter modification allows the transmission zero to be achieved through the resonant rod geometry itself rather than through separate flying rod components, simplifying the manufacturing process
3Reliability
If flying rods are used for signal coupling, then the transmission zero can be generated, but the number of components and materials increases
Solution Approach 1:
The patent combines the resonant rod and flying rod into a single integrated structure. The extension sections of the resonant rods perform the coupling function that previously required separate flying rod components, thereby reducing the total quantity of materials needed while maintaining the signal coupling capability
Solution Approach 2:
The resonant rods are designed to perform multiple functions: they provide resonance within their respective cavities and simultaneously provide capacitive coupling between adjacent cavities through their extension sections. This multi-functionality eliminates the need for separate flying rod components, reducing material quantity
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 proposed design achieves effective generation of transmission zeros on the low-frequency side of the passband without flying rods, enhancing stability, consistency, and reducing manufacturing complexity and costs.
Implementation Method 1
Capacitive coupling is formed between the first sheet-shaped resonant rod and the second sheet-shaped resonant rod
Implementation Method 2
capacitive coupling or inductive coupling is formed between the second sheet-shaped resonant rod and the third sheet-shaped resonant rod
Implementation Method 3
capacitive coupling or inductive coupling is formed between the second sheet-shaped resonant rod and the third sheet-shaped resonant rod
Data Source
AI summary
Disclosed is a cavity filter including a housing, and a first sheet-shaped resonant rod, a second sheet-shaped resonant rod, and a third sheet-shaped resonant rod disposed in the housing. The first sheet-shaped resonant rod includes a first upright section and a first extension section extending from one side of the first upright section. The second sheet-shaped resonant rod includes a second upright section and a second extension section extending from one side of the second upright section. The second upright section, the first upright section, and the third sheet-shaped resonant rod are connected to the housing, and the first extension section and the second extension section extend toward each other. Capacitive coupling is formed between the first and second sheet-shaped resonant rods. Capacitive coupling or inductive coupling is formed between the second and third sheet-shaped resonant rods and between the first and third sheet-shaped resonant rods.