Cavity RF Filter Tuning Screw for Reversible Frequency Adjustment
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Solution Overview
Problem
Conventional cavity-type radio frequency filters require complex and irreversible frequency tuning processes, involving external embossing machines and conventional coupling structures, which are costly and difficult to reverse, limiting their compactness and manufacturing efficiency.
Innovation Solution
A radio frequency filter design featuring a frequency tuning screw with a resilient fixing member, such as a ring-shaped or tapered resilient protrusion, that allows reversible frequency tuning by adjusting the capacitance between the screw and resonant element, eliminating the need for conventional fastening nuts and external embossing machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional coupling structures (tuning screws and fastening nuts) are used for frequency tuning, then frequency tuning can be achieved, but the structure becomes complex and the tuning process becomes irreversible and difficult
Solution Approach 1:
The patent removes the fastening nut component from the conventional tuning screw assembly, extracting only the essential tuning function. The tuning screw is directly integrated into the cover without requiring separate fastening hardware, simplifying the coupling structure while maintaining frequency tuning capability
Solution Approach 2:
The tuning screw and cover are merged into a unified structure where the tuning screw is directly embedded in the cover. This integration eliminates the need for separate fastening nuts and reduces the number of components, making the structure simpler and the tuning operation more reversible
2Manufacturing precision
If external embossing machines are used to form dot peen structures, then frequency tuning can be achieved, but manufacturing cost increases and the process becomes irreversible
Solution Approach 1:
The tuning screw structure serves its own fixing function through direct integration into the cover, eliminating the need for external embossing machines or dot peen structures. The design is self-sufficient, requiring no additional manufacturing steps for frequency tuning
Solution Approach 2:
The complex mechanical system of external embossing machines and dot peen structures is replaced with a simpler integrated tuning screw mechanism. The frequency tuning function is achieved through the tuning screw's direct mechanical adjustment rather than through embossing operations
3Reliability
If conventional fastening nuts are used, then secure fixation is achieved, but the filter structure becomes heavier and larger
Solution Approach 1:
The fastening nut is extracted from the assembly, removing unnecessary weight and volume. The tuning screw achieves secure fixation through its direct integration into the cover without requiring additional fastening components
Solution Approach 2:
The fixation function and tuning function are merged into a single integrated tuning screw structure. This eliminates the need for separate fastening nuts, reducing both weight and structural complexity while maintaining reliable fixation
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 enables simpler, more compact, and lighter radio frequency filters with reversible frequency tuning, reducing manufacturing costs and improving operational efficiency by allowing repeated adjustments of filtering characteristics.
Implementation Method 1
a resilient fixing member, such as a ring-shaped or tapered resilient protrusion, that allows reversible frequency tuning by adjusting the capacitance between the screw and resonant element
Data Source
Figure 1A~1B
Figure 1C~2B
Figure 2C~3B
AI summary
A cavity-type radio frequency filter is disclosed. the radio frequency filter having a cavity structure including an enclosure, a resonant element, a cover, a frequency tuning screw, and a resilient fixing member. The enclosure has a hollow inside and an open surface on one side to have a cavity. The resonant element is positioned in the hollow of the enclosure. The cover has a screw hole having a preset diameter at a position corresponding to the resonant element, and is configured to seal the open surface of the enclosure. The frequency tuning screw is configured to be screwed into the screw hole of the cover, and it has an upper end formed at least partially with a latching abutment that protrudes outwardly.