Microwave Filter Circuit Simplification for Low-Loss Compact Layouts
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Solution Overview
Problem
Conventional microwave filter designs face challenges in achieving a balance between low insertion loss, steep rejection slopes, and compact size, often requiring a compromise between filter selectivity and cost due to the need for multiple resonators with low internal resistance.
Innovation Solution
The Element Removal Design (ERD) technique optimizes acoustic wave microwave filters by reducing the number of circuit elements through computer-aided design, allowing for the removal of insignificant elements and transformation of circuit components, which improves frequency response and reduces the filter's footprint and cost while maintaining traditional manufacturing compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple resonators with low internal resistance are used to achieve steep rejection slopes and low insertion loss, then filter selectivity and performance are improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes insignificant circuit elements from the filter design through computer-aided analysis. By identifying elements that contribute minimally to filter performance, the design eliminates unnecessary resonators and circuit components, reducing complexity while maintaining the required selectivity and rejection characteristics through optimized remaining elements.
Solution Approach 2:
The patent transforms circuit elements between series and parallel configurations and adjusts their impedance values to achieve equivalent or improved performance with fewer components. By changing the parameters and configurations of remaining resonators, the design compensates for reduced element count while maintaining steep rejection slopes and low insertion loss.
2Reliability
If multiple resonators are used to achieve low insertion loss and steep rejection slopes, then filter performance is improved, but filter footprint and manufacturing cost increase
Solution Approach 1:
The patent removes insignificant circuit elements that contribute minimally to filter performance, thereby reducing the physical footprint. By eliminating unnecessary resonators and circuit components, the filter occupies less area on the substrate while maintaining required insertion loss and rejection characteristics through optimized configurations of remaining elements.
Solution Approach 2:
The patent combines the functions of multiple circuit elements into fewer, more efficient resonators. By merging the roles of removed elements into the remaining resonators through proper impedance matching and configuration, the design achieves equivalent performance with reduced footprint.
3Ease of manufacture
If conventional filter design methods are used, then design simplicity is maintained, but circuit element count and manufacturing cost remain high
Solution Approach 1:
The patent applies computer-aided design to identify and extract insignificant circuit elements from conventional filter topologies. This systematic removal of unnecessary components reduces both the circuit element count and manufacturing cost, while the remaining elements are optimized to maintain required filter performance.
Solution Approach 2:
The patent transforms circuit elements between series and parallel configurations and adjusts impedance values to achieve performance equivalence with fewer components. These parameter changes enable cost reduction through reduced element count while maintaining manufacturability through standard component values and configurations.
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
This approach results in filters with lower insertion loss, steeper rejection slopes, and improved out-of-band rejection, achieving a smaller footprint and lower cost without compromising performance, enabling more efficient microwave filter designs.
Implementation Method 1
a plurality of resonators, which store energy very efficiently at a resonant frequency
Implementation Method 2
acoustic wave microwave filters
Data Source
AI summary
A method of designing a microwave filter using a computerized filter optimizer, comprises generating a filter circuit design in process (DIP) comprising a plurality of circuit elements having a plurality of resonant elements and one or more non-resonant elements, optimizing the DIP by inputting the DIP into the computerized filter optimizer, determining that one of the plurality of circuit elements in the DIP is insignificant, removing the one insignificant circuit element from the DIP, deriving a final filter circuit design from the DIP, and manufacturing the microwave filter based on the final filter circuit design.