Bulk Acoustic Wave Resonator Interconnect for Stable Reverse Parallel Links
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Solution Overview
Problem
Existing bulk acoustic wave filters face challenges in achieving stable reverse parallel connections between resonators, leading to unstable connections and additional losses due to the need for through holes and metallization, which affect the depth-to-width ratios of these holes.
Innovation Solution
A bulk acoustic wave resonance assembly is designed with an interconnection region between two resonance assemblies, where the first bottom electrode is connected to the second top electrode and the second bottom electrode is connected to the first top electrode, avoiding the need for through holes by using a large area interconnection region that maintains stability without increasing the device's volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through holes are formed in piezoelectric ceramic thin films to connect electrodes, then reverse parallel connection is achieved, but connection stability deteriorates due to depth-to-width ratios and metallization quality
Solution Approach 1:
The connection path is segmented into multiple sections: the first electrode extends partially into the interconnection region, the second electrode extends partially into the interconnection region, and these extended portions are connected through conductive material in the interconnection region, eliminating the need for deep through-holes
Solution Approach 2:
The connection structure transitions from a vertical through-hole approach to a lateral extension approach in the interconnection region, changing the dimensional orientation of the connection path from depth-oriented to surface-oriented
2Reliability
If top and bottom electrodes are led out of resonance regions for connection, then reverse parallel connection is achieved, but device volume increases
Solution Approach 1:
The interconnection region is merged with the resonance region, allowing electrode connections to be formed within the same spatial footprint rather than requiring additional external connection areas, thus maintaining compact device volume
3Reliability
If through holes are used for electrode connection, then reverse parallel connection is achieved, but additional losses are introduced due to connection quality issues
Solution Approach 1:
The electrode structures are copied and extended into the interconnection region, creating additional connection surfaces that replicate the electrical connection function without requiring deep metallized holes, thereby reducing contact resistance and connection losses
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 design enhances the stability of the reverse parallel connection and reduces losses by ensuring large area connections between electrodes, improving the filtering characteristics of the bulk acoustic wave filter.
Implementation Method 1
Each bulk acoustic wave resonator is prepared by longitudinal resonance of a piezoelectric thin film in a thickness direction
Data Source
AI summary
The present application discloses a bulk acoustic wave resonance assembly and a method for manufacturing the same. The bulk acoustic wave resonance assembly of the present application includes a substrate, a first resonance assembly and a second resonance assembly which are arranged on the substrate; an interconnection region is formed between the first resonance assembly and the second resonance assembly; the first resonance assembly includes a first bottom electrode, a first piezoelectric layer, and a first top electrode which are arranged on the substrate in sequence; the second resonance assembly includes a second bottom electrode, a second piezoelectric layer, and a second top electrode which are arranged on the substrate in sequence; the first bottom electrode and the second top electrode are connected to each other in the interconnection region; and the second bottom electrode and the first top electrode are connected to each other in the interconnection region.