Three-Layer Cavity Filter With Adjustable Slots
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional cavity filters for base stations are bulky, heavy, and costly due to the die-casting production process, which requires expensive molds.
Innovation Solution
A cavity filter design comprising three-layer circuit boards with resonators on the first layer, cavities on the second layer, and a middle layer with adjustable slots and coupling strips for frequency tuning, allowing for reduced weight, cost, and adjustable resonating frequency through turning posts and coupling screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If die-casting production process is used for cavity filter, then manufacturing capability is achieved, but volume and weight become large
Solution Approach 1:
The cavity filter is divided into multiple independent cavity units, each housing a resonator. These modular cavities can be separately manufactured and then assembled together, reducing the volume of individual components while maintaining overall filtering capability through parallel resonance structures.
Solution Approach 2:
The resonators are positioned inside the cavity structures, creating a nested configuration where the resonating elements are contained within the protective cavity housing. This nesting approach maximizes space utilization and reduces the overall volume required for the filter assembly.
2Ease of manufacture
If die-casting production process is used for cavity filter, then manufacturing capability is achieved, but weight becomes large
Solution Approach 1:
Different parts of the cavity filter are made from materials with appropriately selected densities. The cavity housing may use lighter materials while critical resonating components use denser materials only where necessary for acoustic performance, optimizing the weight-to-performance ratio rather than using uniform heavy materials throughout.
Solution Approach 2:
The cavity filter employs composite construction combining different materials with complementary properties. Lightweight structural materials are used for the cavity housing, while specialized resonator materials are used only where acoustic resonance is required, reducing overall weight while maintaining manufacturing capability and performance.
3Device complexity
If traditional cavity filter design is used, then structural simplicity is maintained, but frequency adjustment capability is limited
Solution Approach 1:
The cavity filter incorporates adjustable elements such as movable plungers or variable geometry components within the cavities that allow the resonant frequency to be dynamically tuned. These adjustment mechanisms maintain relatively simple overall structure while providing versatile frequency control capability through minor structural modifications.
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 significantly reduces weight and cost while enabling precise frequency adjustment, improving the efficiency and flexibility of cavity filters in mobile communications.
Implementation Method 1
A plurality of resonators 40 is located on the first layer circuit board 10... A plurality of resonating cavities 31 is located on the second layer circuit board 30 each corresponding to one of the plurality of resonators 40
Implementation Method 2
The plurality of resonating units 200 couple with the slot 21 of the middle layer circuit board 20
Data Source
AI summary
A cavity filter includes a first layer circuit board, a second layer circuit board and a middle layer circuit board locates between the first layer circuit board and the second layer circuit board. A plurality of resonators locates on the first layer circuit board. A plurality of resonating cavities is located on the second layer circuit board one-to-one corresponding to the resonators. A slot is defined on the middle layer circuit board. The resonators traverse through the slot and are placed in the resonating cavities to form a plurality of resonating units, and the plurality of resonating couple with the slot of the middle layer circuit board.