Tuneable Bandpass Filter with Independent Resonator Tuning
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Solution Overview
Problem
Existing tuneable bandpass filters require complex adjustments to both resonant frequency and coupling between resonators to achieve variable frequency and bandwidth, leading to complexity in implementation and relative rejection requirements.
Innovation Solution
A tuneable bandpass filter design comprising a common structure with coupled resonators in upper and lower loops, allowing independent tuning of bandwidth and centre frequency by adjusting resonators without modifying coupling, enabling decomposition into low pass and high pass sub filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both resonant frequency and coupling between resonators are tuned to achieve variable frequency and bandwidth, then the filter meets relative rejection requirements, but the filter becomes complex to implement
Solution Approach 1:
The filter is segmented into two independent sub-filters (low-pass and high-pass) that are cascaded. Each sub-filter handles specific frequency ranges, allowing independent optimization of tuning mechanisms while maintaining overall system simplicity. The segmentation enables variable frequency and bandwidth without requiring complex simultaneous adjustment of all resonator couplings.
Solution Approach 2:
The patent implements dynamic tuning capability where the resonant frequency and coupling between resonators can be adjusted independently. This dynamic adjustment allows the filter to achieve variable frequency and bandwidth while maintaining relative rejection requirements, resolving the contradiction between adaptability and implementation complexity.
2Adaptability or versatility
If coupling between resonators is adjusted to tune bandwidth, then bandwidth control is achieved, but absolute rejection requirements are compromised
Solution Approach 1:
By segmenting the filter into low-pass and high-pass sub-filters with distinct resonator groups, the patent enables independent bandwidth control in each sub-filter without affecting the absolute rejection characteristics of the other. This segmentation preserves rejection requirements while achieving flexible bandwidth control.
Solution Approach 2:
Different parts of the filter (different sub-filters and resonator groups) are optimized for different functions: one sub-filter prioritizes bandwidth control while the other maintains absolute rejection characteristics. This local optimization allows bandwidth adjustment without compromising overall rejection performance.
3Adaptability or versatility
If resonators are tuned to change centre frequency, then frequency tuning is achieved, but coupling adjustments are also required increasing complexity
Solution Approach 1:
The resonators are segmented into different groups belonging to low-pass and high-pass sub-filters. Frequency tuning can be achieved by adjusting resonators in one sub-filter without requiring simultaneous adjustment of couplings in both sub-filters, thereby reducing tuning mechanism complexity while maintaining frequency adaptability.
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
Simplifies the tuning process by allowing independent adjustment of bandwidth and centre frequency through resonator tuning alone, reducing complexity and maintaining absolute rejection requirements, while preserving ease of use and selectivity.
Implementation Method 1
a plurality of coupled resonators, the resonators being arranged in first and second loops
Data Source
AI summary
A tuneable bandpass filter includes a plurality of coupled resonators. A common structure of the filter includes at least one common coupling or one common resonator. An upper loop includes first and second end resonators coupled together by a signal path and further includes at least one further signal path extending between end resonators. The further signal path includes at least one further resonator with the end resonators being coupled to the common structure. A lower loop includes first and second end resonators coupled together by a signal path and further includes at least one further signal path extending between end resonators. The further signal path includes at least one further resonator with the end resonators being coupled to the common structure.