Rotatable Dielectric Microwave Band-Pass Filter for Stable Frequency Tuning
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Solution Overview
Problem
Existing frequency-tunable band-pass filters in the microwave domain face challenges with reliability, power consumption, and performance deterioration, particularly in achieving precise central frequency tuning and maintaining frequency stability with temperature variations.
Innovation Solution
A band-pass filter design featuring rotatable dielectric elements with recesses and elongate excitation means, allowing for controlled disruption of the electromagnetic field and capacitive effects within metal cavities, enabling continuous tuning of the central frequency while maintaining bandwidth and stability across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive semiconductor components (PIN diodes, capacitive switches) or MEMS are used for frequency tuning, then frequency tunability is achieved, but reliability decreases and power consumption increases
Solution Approach 1:
The patent replaces electronic tuning mechanisms (PIN diodes, capacitive switches, MEMS) with a mechanical rotation system. Dielectric elements are rotated to different angular positions within metal cavities to achieve frequency tuning, substituting electronic control with mechanical positioning. This eliminates the reliability issues and power consumption associated with semiconductor components while maintaining frequency tunability.
Solution Approach 2:
The patent changes the physical position parameter of dielectric elements by rotating them to different angular orientations within the cavities. This positional parameter change modifies the capacitive effect and electromagnetic field distribution, enabling frequency tuning without requiring active electronic components. The continuous adjustability of the rotation angle provides wide frequency tuning range.
2Adaptability or versatility
If frequency tuning is implemented using conventional methods, then central frequency can be adjusted, but quality factor Q deteriorates significantly
Solution Approach 1:
The patent applies local quality by using multiple dielectric elements positioned at specific locations within metal cavities. Each dielectric element creates a localized capacitive effect that can be independently adjusted by rotation. This localized control allows frequency tuning while maintaining the overall quality factor, as only local field distributions are modified rather than the entire resonator structure.
3Adaptability or versatility
If dielectric elements are rotated for frequency tuning, then central frequency can be continuously adjusted, but sensitivity to temperature variations increases
Solution Approach 1:
The patent uses composite structures combining metal cavities with dielectric elements. The metal cavities provide a stable mechanical framework with low thermal expansion, while the dielectric elements provide the necessary capacitive effect for frequency tuning. This composite approach helps mitigate temperature sensitivity by combining materials with complementary thermal properties.
4Measurement precision
If multiple resonators are coupled together to increase selectivity, then bandwidth control is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple resonators by coupling them together with controlled coupling mechanisms (apertures, slots, probes). This allows the resonators to work collectively to achieve the desired selectivity and bandwidth characteristics. The coupling between resonators is designed to be controlled and optimized, enabling bandwidth adjustment without requiring each resonator to be independently complex.
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 reliable, efficient frequency tuning with reduced power consumption and improved performance by allowing precise adjustment of the central frequency and maintaining stability across temperature variations, enhancing the filter's selectivity and adaptability.
Implementation Method 1
modifying the capacitive effect and maintaining strong electromagnetic field disruption
Implementation Method 2
disrupting the resonance mode of the microwave in the metal input cavity
Implementation Method 3
an input dielectric element placed inside the metal input cavity
Data Source
AI summary
A band-pass filter for microwave is provided that can be frequency-tuned the filter comprising an input resonator comprising a metal input cavity and an input dielectric element, an output resonator comprising a metal output cavity and an output dielectric element, an input excitation means (S1) of elongate shape, an output excitation means of elongate shape, the input resonator and the output resonator being coupled, characterized in that the input dielectric element and the output dielectric element have a recess, the input excitation means penetrates the recess of the input dielectric element the output excitation means penetrates the recess of the output dielectric element, the input dielectric element is capable of carrying out a rotation about an input rotation axis, the rotations of the dielectric elements allowing the modification of the central frequency of the filter.