Semiconductor Waveguide Assembly for Optical RF Impedance Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current waveguide switches for RF signals at mm-wave frequencies are large, heavy, and difficult to integrate with planar microwave technology, and existing solutions face challenges with self-actuation, reliability, and stiction issues, especially for high-power applications.
Innovation Solution
A waveguide assembly integrated with a semiconductor wafer featuring a metallic-lined waveguide channel with semiconductor obstacle members that respond to applied electromagnetic radiation to vary impedance, allowing for switching, attenuating, and routing of RF signals, utilizing microfabrication processes and optically transparent semiconductor layers for excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal-machined waveguides are used for RF switching, then low insertion loss and high power handling are achieved, but the device becomes large, heavy, and difficult to integrate with planar microwave technology
Solution Approach 1:
The patent replaces traditional mechanical metal-machined waveguides with a semiconductor-based waveguide structure that can be fabricated using standard semiconductor manufacturing processes. The waveguide is formed by creating a trench in the semiconductor substrate and filling it with metal, eliminating the need for complex mechanical machining and enabling integration with planar microwave technology while maintaining low insertion loss and high power handling capabilities
Solution Approach 2:
The patent changes the fundamental material parameter from traditional metals to semiconductor materials (such as silicon or gallium arsenide) for the waveguide structure. This material parameter change enables the waveguide to be compatible with semiconductor fabrication processes, reducing size and weight while maintaining the electrical performance characteristics of low insertion loss and high power handling
2Device complexity
If RF MEMS switches are used for waveguide switching, then integration with planar technology is improved, but self-actuation, reliability, and stiction issues limit use for high power applications
Solution Approach 1:
The patent replaces the mechanical MEMS switching mechanism with a semiconductor-based switching structure that uses electric field control rather than mechanical movement. The switch is formed by creating a depletion region in the semiconductor material through applied voltage, eliminating moving parts and associated reliability issues such as stiction and self-actuation problems while maintaining integration capability
Solution Approach 2:
The patent extracts and removes the problematic mechanical components from the switching mechanism, retaining only the essential electrical control function. By eliminating the moving MEMS parts and using purely electrical field control in the semiconductor structure, the design achieves high reliability for high power applications while maintaining planar integration
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 solution provides high power handling, low insertion loss, and fast switching times with improved reliability and integration capabilities, enabling efficient RF signal management within a compact and planar form factor.
Implementation Method 1
the semiconductor obstacle member is responsive to applied electromagnetic radiation to vary electrical conductance of the obstacle member
Data Source
AI summary
A waveguide assembly integrated with a semiconductor wafer is provided. The waveguide assembly includes a waveguide channel defined by internal walls of the wafer lined with a metallic layer, and having at least one port for transmission of the RF signal into or out of the waveguide channel. The waveguide assembly also includes a semiconductor obstacle member disposed in the waveguide channel. The waveguide assembly may be fabricated using etching and deposition processes for semiconductor devices. In use, selectively varying either one or both of frequency or power level of electromagnetic radiation applied to the obstacle member varies electrical conductance of the obstacle member, and thereby varies the electrical impedance of the obstacle member to transmission of the RF signal through the waveguide channel. The waveguide assembly may be used for switching, attenuating, routing, filtering, and transforming the RF signal.