Air Cavity Isolation for SoC Duplexer Interference
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Solution Overview
Problem
In System on Chip (SoC) structures, integrating multiple elements on a single substrate leads to interference issues, including heat and noise transmission, which can cause system malfunctions, especially when fabricating duplexers for compact electronic devices.
Innovation Solution
Incorporating an air cavity between the transmitter and receiver filters on the substrate, fabricated by etching, to physically isolate these components and prevent heat and noise interference, along with using air gap type resonators and packaging substrates for effective signal handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple elements are integrated on a single substrate to achieve compact SoC structure, then device compactness and integration are improved, but heat and noise transmission between elements increases causing system malfunction
Solution Approach 1:
The substrate is divided into multiple isolated regions by etching air cavities between adjacent elements. This segmentation creates physical barriers that prevent heat and noise transmission while maintaining compact integration, directly resolving the contradiction between compactness and harmful factor isolation.
Solution Approach 2:
Air cavities are introduced as intermediary structures between adjacent elements on the substrate. These air gaps act as thermal and acoustic insulators, blocking the transmission of heat and noise while allowing the elements to remain closely integrated on the same substrate, thus solving the contradiction.
2Reliability
If phase shifter is used to isolate phases of transmitted and received signals, then signal phase isolation is improved, but physical heat and noise transmission through substrate is not effectively intercepted
Solution Approach 1:
Air cavities are etched into the substrate to segment it into isolated regions. This physical segmentation blocks thermal and acoustic pathways between elements, complementing the electrical phase isolation provided by phase shifters and addressing the limitation of phase shifters alone.
Solution Approach 2:
Air gaps serve as intermediary thermal and acoustic barriers between elements. While phase shifters handle electrical signal isolation, the air cavities mediate the physical transmission paths for heat and noise, providing comprehensive isolation that phase shifters cannot achieve alone.
3Area of stationary object
If substrate area is reduced to achieve compact duplexer fabrication, then device compactness is improved, but heat and noise transmission to other elements increases causing system errors
Solution Approach 1:
The compact substrate is segmented into isolated zones using air cavities. This allows elements to be positioned close together for compactness while the air gap segmentation prevents harmful factor transmission, resolving the contradiction between small area and harmful factor isolation.
Solution Approach 2:
Air cavities act as intermediary barriers in the compact substrate layout. They block thermal and acoustic transmission pathways that would otherwise exist in closely spaced elements, enabling compact design without sacrificing reliability against heat and noise interference.
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 air cavity effectively intercepts heat and noise transmission between filters, enhancing the reliability of SoC structures and duplexer performance by preventing interference, thus reducing the likelihood of system errors.
Implementation Method 1
an air cavity fabricated in an area between the predetermined first and second areas by etching the substrate to isolate the transmitter and receiver filters from each other
Implementation Method 2
an air cavity fabricated in an area between the predetermined first and second areas by etching the substrate to isolate the transmitter and receiver filters from each other
Data Source
AI summary
A duplexer which prevents effects between transmitter and receiver filters. The duplexer include a substrate, a transmitter filter fabricated in a predetermined first area on a surface of the substrate, a receiver filter fabricated in a predetermined second area on the surface of the substrate and an air cavity fabricated in an area between the predetermined first and second areas by etching the substrate to isolate the transmitter and receiver filters from each other. The air cavity is fabricated in the substrate perpendicular to directions along which the transmitter and receiver filters are disposed. Accordingly, physical effects among elements can be effectively intercepted.