Silicon RF System with Dual-Side Integration
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Solution Overview
Problem
Current RF systems face challenges in miniaturization and integration due to the need for different manufacturing processes for silicon-based RF MEMS devices and ceramic-based LTCC or MLB substrates, leading to increased size and manufacturing costs.
Innovation Solution
A RF system is developed using a single silicon substrate with RF devices formed on both sides, including active and passive devices, and RF MEMS devices, with grooves for electrical isolation and via-holes for interconnection, allowing for a unified silicon process manufacturing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different manufacturing processes (silicon process for RF MEMS devices and LTCC/MLB process for substrates) are used, then RF MEMS devices can be formed with required performance, but manufacturing complexity increases and costs increase
Solution Approach 1:
The patent merges the substrate manufacturing process with the RF MEMS device fabrication process by using a silicon substrate that can be processed through the same silicon-based manufacturing steps as the RF MEMS devices. This eliminates the need for separate LTCC or MLB substrate processes, thereby reducing manufacturing complexity while maintaining device performance.
Solution Approach 2:
The silicon substrate serves multiple functions: it acts as both the structural support and the functional platform for RF MEMS devices. The substrate is designed to accommodate various RF MEMS components (switches, filters, duplexers) and can be processed uniformly with the devices, providing universal compatibility across different RF system configurations.
2Device complexity
If RF devices are arranged two-dimensionally on the top side of the substrate, then manufacturing is simplified, but the size of the RF system increases
Solution Approach 1:
The patent transitions from two-dimensional arrangement of RF devices on the substrate surface to three-dimensional integration by forming RF MEMS devices that extend vertically from the substrate. This vertical stacking approach allows multiple RF components to be integrated in the third dimension, significantly reducing the footprint area while maintaining manufacturing simplicity through standard silicon processing techniques.
3Reliability
If a separate protective film is formed to protect RF MEMS devices, then device protection is achieved, but integration density decreases and miniaturization is limited
Solution Approach 1:
The protective function is merged with the substrate structure itself. The silicon substrate is designed to provide inherent mechanical support and protection to the RF MEMS devices, eliminating the need for separate protective films. This integration maintains device protection while maximizing space utilization and enabling further miniaturization.
4Reliability
If multiple different processes are used to form substrate and RF devices, then各自 component quality is ensured, but manufacturing costs increase
Solution Approach 1:
The patent combines the substrate fabrication and RF MEMS device manufacturing into a single unified silicon-based process flow. This eliminates the need for separate LTCC or MLB substrate processes and subsequent bonding operations, thereby reducing manufacturing steps, lowering costs, and maintaining component quality through consistent process control.
Data Source
AI summary
A RF system which includes a silicon substrate formed with at least one via-hole filled with conductive material so that both sides of the silicon substrate are electrically connected with one another; at least one flat device formed on one side of the silicon substrate; and at least one RF MEMS device formed on the other side of the silicon substrate.