Programmable Frequency Selective Surface with Integrated Circuits
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Solution Overview
Problem
There is a need for a surface, such as a radome, with frequency-dependent transmission and reflection characteristics that can be controllably altered in response to changing circumstances, allowing for shielding from external electromagnetic radiation at times and transmitting internal radiation at other times.
Innovation Solution
A frequency selective surface with conductive patches and integrated circuits straddling gaps between them, where the integrated circuits can change impedance in response to digital control words, modifying the surface's electromagnetic transmission or reflection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed frequency selective surface is used, then the transmission and reflection characteristics are stable, but the surface cannot adapt to changing circumstances and cannot dynamically control electromagnetic wave transmission or reflection
Solution Approach 1:
The patent applies the dynamics principle by making the frequency selective surface reconfigurable through integrated circuits that can dynamically change the impedance of conductive patches. The surface transitions from a fixed structure to a dynamic one where the electrical characteristics can be adjusted in real-time based on control signals, enabling adaptation to different operational requirements while maintaining a relatively simple physical structure.
Solution Approach 2:
The patent implements parameter changes by varying the impedance values of the conductive patches through integrated circuits. By changing electrical parameters (impedance, conductivity) of individual patches based on control words, the surface can selectively transmit or reflect electromagnetic waves at different frequencies, achieving adaptability without requiring physical reconfiguration of the entire surface structure.
2Adaptability or versatility
If integrated circuits are added to each gap to enable controllable impedance, then the frequency selective surface becomes programmable and adaptable, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the frequency selective surface into discrete units, each consisting of conductive patches separated by gaps with individual integrated circuits. This modular approach allows each unit to be controlled independently, enabling programmable frequency selection while simplifying manufacturing through repetitive modular assembly rather than requiring a custom complex structure.
Solution Approach 2:
The integrated circuits serve multiple functions: they control the impedance of conductive patches, receive digital control words, and enable the surface to perform different functions (transmission or reflection) at different frequencies. This multi-functionality reduces the need for multiple specialized components, thereby simplifying the overall manufacturing process while achieving programmable adaptability.
3Adaptability or versatility
If the surface structure is made more complex to enable dynamic control, then the frequency selective characteristics can be changed, but the manufacturing precision requirements increase
Solution Approach 1:
The integrated circuits act as intermediaries between the control system and the conductive patches. They provide a buffer that simplifies the connection between control signals and the electromagnetic structure, reducing the need for extremely precise direct connections. The circuits can tolerate certain variations in gap dimensions and patch alignments, thereby reducing manufacturing precision requirements while maintaining dynamic control capability.
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
Enables dynamic control of the surface's properties, allowing it to selectively transmit or reflect electromagnetic waves based on received control signals, effectively changing its frequency-dependent behavior in response to changing conditions.
Implementation Method 1
each integrated circuit presents a controllable impedance and as a result the characteristics of the frequency selective surface are controllable
Implementation Method 2
a surface, such as a radome, through which electromagnetic waves may be transmitted or from which they may reflect, to have frequency dependent transmission and reflection characteristics
Data Source
AI summary
A controllable frequency selective surface. The frequency selective surface has a plurality of conductive patches with integrated circuits straddling gaps between, and connected to, pairs of patches separated by gaps. Each integrated circuit presents a controllable impedance and as a result the characteristics of the frequency selective surface are controllable.