Monolithic Antenna Switch-Diplexer Integration for RF Isolation
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Solution Overview
Problem
Existing diplexer fabrication processes face challenges in achieving high Q-factor, reducing electromagnetic coupling, and optimizing size and cost-effectiveness, particularly in mobile RF transceivers with complex circuit functions.
Innovation Solution
Monolithic integration of an antenna switch and diplexer on a silicon-on-insulator (SOI) layer, using a resistive substrate and a Faraday cage structure to minimize electromagnetic coupling and reduce costs, with fabrication through FEOL, MOL, and BEOL processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate discrete components are used for antenna switch and diplexer, then each component can be optimized independently, but the overall device size, component count, and assembly complexity increase
Solution Approach 1:
The patent combines the antenna switch and diplexer into a single integrated device fabricated on one substrate. The switch portion and diplexer portion share common substrate real estate and can share common RF interfaces, eliminating the need for separate discrete components and reducing assembly complexity while maintaining independent optimization capabilities through separate design regions.
2Adaptability or versatility
If separate discrete components are used for antenna switch and diplexer, then design flexibility is maintained, but the overall device footprint and number of RF interfaces increase
Solution Approach 1:
The integrated device nests the switch portion and diplexer portion within a shared substrate area. The switch portion can be positioned to share RF interfaces with the diplexer portion, allowing compact nesting that reduces the overall device footprint while maintaining the functional independence and design flexibility of each component.
3Adaptability or versatility
If multiple discrete components are assembled, then functional modularity is achieved, but manufacturing steps and assembly processes become more complex
Solution Approach 1:
The patent merges the manufacturing processes by fabricating both the switch portion and diplexer portion in the same semiconductor fabrication process on a single substrate. This eliminates multiple assembly steps while maintaining functional modularity through separate design regions that can be independently optimized and configured.
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
Enhances RF performance by reducing electromagnetic coupling and cost, while maintaining high Q-factor and compact size, thus improving efficiency and reducing manufacturing complexity.
Implementation Method 1
a Faraday cage structure to minimize electromagnetic coupling
Implementation Method 2
Monolithic integration of an antenna switch and diplexer on a silicon-on-insulator (SOI) layer, using a resistive substrate
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
An integrated radio frequency (RF) circuit structure may include a resistive substrate material and a switch. The switch may be arranged in a silicon on insulator (SOI) layer supported by the resistive substrate material. The integrated RF circuit structure may also include an isolation layer coupled to the SOI layer. The integrated RF circuit structure may further include a filter, composed of inductors and capacitors. The filter may be arranged on a surface of the integrated RF circuit structure, opposite the resistive substrate material. In addition, the switch may be arranged on a first surface of the isolation layer.