Rotatable Dielectric Elements for Tunable Microwave Filter
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Solution Overview
Problem
Current frequency-tunable bandpass filters for microwaves face challenges with complex designs, high energy consumption, unreliability, and significant degradation of performance, particularly in terms of the quality factor Q, due to the use of passive semiconductor components and MEMS technologies, which limit signal processing power and tunability.
Innovation Solution
A band-pass filter design featuring rotatable dielectric elements within metal cavities, allowing for precise adjustment of the central frequency by modifying the capacitive effect through angular orientation, thereby enabling continuous tunability of the filter's central frequency while maintaining performance across temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive semiconductor components or MEMS are used for frequency tuning, then frequency tunability is achieved, but device complexity increases and reliability decreases
Solution Approach 1:
The patent replaces semiconductor components and MEMS with a mechanical rotation system. Dielectric elements are rotated within metal cavities to adjust the central frequency, eliminating the need for complex electronic tuning mechanisms and improving reliability through a simpler mechanical approach
Solution Approach 2:
The patent changes the physical orientation parameter of dielectric elements by rotating them to different angular positions. This rotation modifies the capacitive effect and resonant frequency of the cavities, enabling continuous frequency tuning without complex components
2Adaptability or versatility
If passive semiconductor components or MEMS are used for frequency tuning, then frequency tunability is achieved, but energy consumption increases
Solution Approach 1:
The patent replaces energy-consuming semiconductor and MEMS systems with a passive mechanical rotation system. The dielectric elements are rotated to tuning positions and remain stationary during operation, eliminating continuous energy consumption associated with electronic tuning components
3Adaptability or versatility
If frequency tuning is implemented using conventional methods, then central frequency adjustment is possible, but quality factor Q degrades significantly
Solution Approach 1:
The patent changes the orientation parameter of dielectric elements through rotation, which adjusts the central frequency while maintaining the quality factor. The dielectric elements are positioned at specific angular orientations to optimize both tuning capability and filter performance
4Adaptability or versatility
If dielectric elements are rotated for frequency tuning, then central frequency is adjustable, but maintaining excitation element position inside recess becomes challenging
Solution Approach 1:
The patent nests the excitation elements inside recesses of the dielectric elements. This nested configuration ensures that the excitation elements remain properly positioned within the dielectric structures during rotation, simplifying assembly and manufacturing while maintaining tuning capability
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 solution provides a reliable and efficient method for tuning the central frequency of microwave filters, enhancing their selectivity and stability, reducing energy consumption, and maintaining performance across temperature fluctuations, thus overcoming the limitations of existing technologies.
Implementation Method 1
allowing for precise adjustment of the central frequency by modifying the capacitive effect through angular orientation
Implementation Method 2
adapted to disturb the resonance mode of the microwave wave in the input cavity
Implementation Method 3
The input dielectric element is rotatable about an input rotation axis... enabling continuous tunability of the filter's central frequency while maintaining performance
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
The filter (100) has an output dielectric element (E1) for carrying out a rotation about an output rotation axis (X1), where a recess (42) allows the rotation of another dielectric element while keeping an output excitation element (SN) inside the recess. The dielectric elements are formed in flat shape with height, which is less by a factor of 3 than the smallest external dimension in a plane perpendicular to a direction supporting the height. The rotations of the dielectric elements allow the modification of the central frequency of the filter.