Step-Like Cavity Resonator Structure for Corrosion-Resistant RF Tuning
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Solution Overview
Problem
Semiconductor structures used in radio-frequency applications are exposed during long manufacturing times, leading to structural damage such as corrosion, which can result in defects like altered resonant frequencies or inoperable resonators.
Innovation Solution
The semiconductor die incorporates a graduated, 'step-like' structure with multiple resonator trenches of varying depths within a dielectric layer, along with a shared capping plate, to reduce manufacturing time and exposure to etchant gases, thereby minimizing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If semiconductor structures are exposed during long manufacturing times, then manufacturing precision can be improved through multiple processing steps, but structural damage including corrosion increases
Solution Approach 1:
The patent applies preliminary action by forming a protective capping plate structure before the resonator trenches are fully etched. This capping plate is deposited and patterned to cover the resonator structures during subsequent manufacturing steps, preventing corrosion before it can occur during the manufacturing process.
Solution Approach 2:
The patent introduces a capping plate as an intermediary protective layer between the resonator trenches and the corrosive manufacturing environment. This capping plate acts as a mediator that shields the sensitive resonator structures from damage while allowing manufacturing processes to continue.
2Manufacturing precision
If multiple processing steps are used to form resonator structures, then manufacturing precision is improved, but manufacturing time increases
Solution Approach 1:
The patent merges multiple processing steps by combining the formation of the capping plate with the resonator trench etching process. The capping plate is formed and then used as an etch mask during the trench formation, consolidating what would otherwise be separate operations into a more integrated process flow.
Solution Approach 2:
The capping plate structure serves multiple functions: it protects the resonator trenches from corrosion, acts as an etch mask during trench formation, and provides a structural cap for the resonator. This multi-functionality reduces the need for separate dedicated protective layers or processing steps.
3Adaptability or versatility
If resonator trenches are etched to varying depths, then resonator performance is improved through frequency tuning, but exposure to etchant gases increases corrosion risk
Solution Approach 1:
The capping plate is formed before the resonator trenches are etched to varying depths. This preliminary formation of the protective structure ensures that all trenches, regardless of their final depth, are protected from etchant gas corrosion during the selective etching process.
Solution Approach 2:
The patent applies local quality by allowing different regions of the structure to have different trench depths for frequency tuning, while the capping plate provides uniform protective coverage across all regions. This enables localized frequency adjustment without compromising overall structural protection.
Data Source
AI summary
Devices and methods of manufacture for a graduated, “step-like,” semiconductor structure having two or more resonator trenches. A semiconductor structure may comprise a first resonator and a second resonator. The first resonator comprising a first metallic resonance layer and a capping plate having a bottom surface that is a first distance from a distal end of the first metallic resonance layer 128. The second resonator comprising a second metallic resonance layer and the capping plate, in which the bottom surface is a second distance from a from a distal end of the second metallic resonance layer 128b, and in which first distance is different from the second distance.