BAW Resonator Grounded Metal Bonding Layer for Heat Dissipation
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Solution Overview
Problem
Conventional bulk acoustic wave (BAW) resonator manufacturing faces challenges with metal bonding layers, as they can negatively impact resonator performance and are difficult to bond with strict requirements, whereas metal bonding processes like eutectic or metal diffusion bonding lack stringent conditions but complicate heat dissipation and radio frequency power handling.
Innovation Solution
A BAW resonator design incorporating a metal bonding layer that is grounded, reducing its influence on performance and enhancing heat dissipation by electrically connecting it to a ground pad metal layer, thereby improving the resonator's radio frequency power withstand capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal bonding layer is used in conventional BAW resonator manufacturing, then bonding is easier to achieve with less strict requirements, but heat dissipation becomes more difficult and radio frequency power handling capability deteriorates
Solution Approach 1:
The metal bonding layer is segmented into two functional parts: a bonding portion that provides ease of bonding, and a grounded portion that provides heat dissipation and RF power handling. This segmentation allows each part to optimize its specific function without compromising the other.
Solution Approach 2:
A dielectric layer is introduced as an intermediary between the metal bonding layer and the ground pad. This dielectric layer with appropriate breakdown voltage enables thermal coupling to ground for heat dissipation while maintaining electrical isolation to prevent RF signal degradation.
2Ease of manufacture
If a metal bonding layer is used in conventional BAW resonator manufacturing, then bonding process is simplified, but radio frequency power withstand capability deteriorates
Solution Approach 1:
The metal bonding layer is divided into a bonding portion and a grounded portion, allowing the bonding process to be simplified while the grounded portion provides a safe path for RF power dissipation, thereby maintaining reliability.
Solution Approach 2:
The dielectric layer acts as an intermediary that allows thermal energy to reach ground while blocking RF signals, thus protecting the RF circuitry and maintaining power withstand capability.
3Manufacturing precision
If strict bonding requirements are applied, then bonding quality is improved, but manufacturing complexity and difficulty increase
Solution Approach 1:
By segmenting the metal bonding layer into bonding and grounded portions, the bonding process can use less strict requirements while still achieving good bonding quality, reducing manufacturing complexity.
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
The grounded metal bonding layer minimizes performance degradation while facilitating effective heat dissipation, thereby enhancing the BAW resonator's operational capabilities and quality.
Implementation Method 1
A bulk acoustic wave (BAW) resonator is a device including a thin film that is made of a piezoelectric material and disposed between two electrodes
Implementation Method 2
enhancing heat dissipation by electrically connecting it to a ground pad metal layer
Data Source
AI summary
A bulk acoustic wave (BAW) resonator includes: a substrate; a piezoelectric layer disposed above the substrate; a first electrode disposed below the piezoelectric layer; a second electrode disposed above the piezoelectric layer; a first dielectric layer disposed below the piezoelectric layer; a second dielectric layer disposed below the first dielectric layer; a cavity disposed below the first electrode; a first grounded through hole disposed in the first dielectric layer and the second dielectric layer and spaced away from the cavity; a metal bonding layer disposed between the second dielectric layer and the substrate; a second grounded through hole disposed in the piezoelectric layer and aligned with the first grounded through hole, and a ground pad metal layer disposed on the piezoelectric layer and in the second grounded through hole, and electrically connected to the metal bonding layer.