Stacked RF Filter Resonator With Acoustic Mirror Decoupling
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Solution Overview
Problem
Conventional RF filter devices face challenges in miniaturization and maintaining specific isolation between circuit segments, making it difficult to comply with modern specifications while integrating more circuit elements in a smaller volume.
Innovation Solution
The RF filter device incorporates a resonator structure with an active structure and an acoustic mirror, where the acoustic mirror is arranged between the active structure and the further electric circuit, providing improved isolation and electromagnetic decoupling, and enabling a higher integration density of circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resonators are used to maintain isolation between circuit segments, then electrical performance is maintained, but device size increases and integration density decreases
Solution Approach 1:
The patent transitions from planar circuit layout to a three-dimensional stacked architecture where resonators and circuit elements are arranged in vertical layers. The resonator structure with top and bottom electrodes stacked above and below the acoustic mirror enables vertical stacking, increasing integration density while maintaining isolation through the acoustic mirror barrier.
Solution Approach 2:
The patent implements nested integration by placing circuit elements within the vertical space of the resonator structure. Circuit elements are positioned between the acoustic mirror and the piezoelectric layers, effectively nesting multiple functional components within a compact three-dimensional footprint rather than requiring separate planar spaces.
2Quantity of substance
If more circuit elements are integrated in a smaller volume, then integration density increases, but isolation between different circuit segments deteriorates
Solution Approach 1:
The acoustic mirror serves as an intermediary barrier between different circuit segments and resonator structures. This intermediate layer with high acoustic impedance prevents harmful acoustic wave propagation and electromagnetic interference between closely spaced circuit elements, enabling high integration density while maintaining segment isolation.
Solution Approach 2:
The patent employs composite material structures combining piezoelectric layers, acoustic mirror materials with different acoustic impedances, and conductive electrodes. This composite construction creates acoustic and electromagnetic barriers that isolate circuit segments while allowing the overall device to maintain a compact integrated form factor.
3Ease of manufacture
If conventional resonator structures are used, then manufacturing is simpler, but device size increases and electrical performance specifications are not met
Solution Approach 1:
The resonator structure is segmented into distinct functional layers including top and bottom electrodes, piezoelectric material layers, and an acoustic mirror. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall manufacturing feasibility through standardized layer-by-layer fabrication processes.
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 configuration allows for the creation of smaller RF filter devices with improved electrical performance, increased integration density, and enhanced electromagnetic shielding, effectively addressing the challenges of miniaturization and isolation.
Implementation Method 1
Electroacoustic resonators employ the piezoelectric effect to convert between RF signals and acoustic waves
Implementation Method 2
the acoustic mirror acts as a reflection structure for the acoustic waves and reflects acoustic waves back to the active structure
Data Source
AI summary
An RF filter device that provides small spatial dimensions and good electric performance is provided. The filter device comprises a resonator structure and a further electric circuit. An acoustic mirror is arranged between the active structure and the further electric circuit.