Acoustic Microwave Filter Modeling Across Temperature Shifts
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Solution Overview
Problem
Current methods for modeling acoustic microwave filters over a temperature range are inadequate, as they either simplify the frequency response shift or require complex and time-consuming parameter modeling, failing to accurately predict the filter's performance across varying temperatures.
Innovation Solution
A method involving the introduction of lumped capacitive and inductive elements into the filter circuit design, which shifts the resonant element's admittance value, allowing for simulation and optimization across different temperatures, ensuring the filter meets frequency response requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional parameter modeling methods are used to model acoustic microwave filters over a temperature range, then the modeling process becomes complex and time-consuming, but the accuracy of frequency response prediction is improved
Solution Approach 1:
The patent uses a simplified copy or approximation of the complex parameter modeling approach. Instead of performing full complex parameter modeling for each temperature point, the invention creates a simplified model that replicates the essential temperature-dependent frequency response behavior, dramatically reducing computation time while maintaining sufficient accuracy for filter design and optimization.
Solution Approach 2:
The patent transforms the complex parameter modeling problem into a simpler parameter adjustment problem. By identifying key parameters that dominate temperature-dependent behavior and adjusting only those parameters across temperature ranges, the invention achieves accurate frequency response prediction without the computational burden of modeling all parameters, thus resolving the contradiction between accuracy and time consumption.
2Productivity
If simplified frequency response shift modeling is used, then the modeling process is faster and simpler, but the accuracy of predicting filter performance across temperatures deteriorates
Solution Approach 1:
The patent applies partial action by selectively modeling only the most significant aspects of temperature-dependent frequency response behavior. Rather than attempting to capture every detail of the complex parameter variations, the invention focuses on the dominant effects that primarily influence filter performance, achieving a practical balance between modeling efficiency and sufficient prediction accuracy for design purposes.
3Manufacturing precision
If complex parameter modeling is performed to accurately predict filter performance, then the design accuracy is improved, but the device complexity and computational resources required increase
Solution Approach 1:
The patent extracts and isolates the critical temperature-dependent parameters from the full complex parameter set. By separating the essential parameters that govern frequency response shifts from the less significant parameters, the invention creates a streamlined modeling approach that maintains design accuracy while reducing overall modeling complexity and computational resource requirements.
Data Source
AI summary
A method of designing an acoustic microwave filter comprises generating a proposed filter circuit design having an acoustic resonant element with a defined admittance value, introducing a lumped capacitive element in parallel and a lumped inductive element in series with the resonant element, selecting a first capacitance value for the capacitive element and a first inductance value for the inductive element, thereby creating a first temperature modeled filter circuit design, simulating the first temperature modeled filter circuit design at a first operating temperature, thereby generating a first frequency response, selecting a second capacitance value for the capacitive element and a second inductance value for the inductive element, thereby creating a second temperature modeled filter circuit design, simulating the second temperature modeled filter circuit design at a second operating temperature, thereby generating a second frequency response, and comparing the first and second frequency responses to the frequency response requirements.