RF Filter Acoustic Mirror Layout for Dense Circuit Isolation
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Solution Overview
Problem
Conventional RF filter devices face challenges in miniaturization and maintaining isolation between circuit elements, making it difficult to meet modern specifications with increased circuit elements in a smaller volume while maintaining electrical performance.
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 electric circuit, utilizing a layer stack of alternating low and high acoustic impedance materials to achieve high reflection coefficients and electromagnetic decoupling, allowing for increased integration density and improved electrical response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the spatial dimensions of the RF filter device are reduced to meet miniaturization trends, then the device size is reduced, but the isolation between different circuit segments deteriorates
Solution Approach 1:
An acoustic mirror is introduced as an intermediary component between the resonator structure and the further electric circuit. This acoustic mirror consists of a layer stack with alternating high and low acoustic impedance layers that reflects acoustic waves back into the resonator while providing electromagnetic shielding. By placing this intermediary structure, the patent achieves both miniaturization and maintained isolation between circuit segments.
Solution Approach 2:
The acoustic mirror is constructed using composite material layers with different acoustic impedance properties (alternating high and low acoustic impedance materials). This composite structure enables the mirror to simultaneously achieve acoustic reflection and electromagnetic shielding functions, resolving the contradiction between reduced device size and maintained circuit isolation.
2Productivity
If more circuit elements are integrated in a smaller volume to meet modern specifications, then the integration density is increased, but the electrical performance and isolation between elements deteriorates
Solution Approach 1:
The acoustic mirror serves as an electromagnetic shield and intermediary barrier between densely integrated circuit elements. The layer stack structure with alternating acoustic impedances creates acoustic reflection while the conductive layers provide electromagnetic shielding, enabling high integration density without compromising electrical performance or isolation between elements.
Solution Approach 2:
The patent uses vertical layering (stacking) to achieve three-dimensional integration, allowing more circuit elements to be integrated in a smaller volume while the acoustic mirror provides isolation in the vertical dimension. This dimensional approach enables increased integration density while maintaining electrical performance through the shielding effect of the mirror structure.
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 enables the integration of more circuit elements in a smaller spatial volume, enhancing electrical performance and providing effective electromagnetic shielding without compromising acoustic properties, thus supporting the trend towards miniaturization and increased functionalities in communication devices.
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
Implementation Method 3
Each interface between a layer of a low acoustic impedance and a high acoustic impedance—and vice versa—reflects acoustic waves to a certain degree
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 minor is arranged between the active structure and the further electric circuit.