Bistatic Resonant Structure for Oblique Angle Signal Detection
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Solution Overview
Problem
Existing RF devices, such as RFID tags, face challenges in maintaining signal strength and independence from orientation when the transmitter and receiver are not positioned normal to the conductive surface, making it difficult to detect resonances at oblique angles, which is crucial for applications like synthetic aperture radar (SAR) and inverse SAR (ISAR) imaging.
Innovation Solution
A system with a resonant structure featuring a conductive surface layer on a dielectric layer that produces enhanced or reduced backscattered radiation in resonant frequency bands, where the transmitter illuminates at a first angle and the receiver detects at a second angle differing by at least five degrees, allowing for data encoding in frequency and polarization responses without the need for an integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the transmitter and receiver are positioned normal to the conductive surface, then signal strength is maximized, but the system cannot achieve spatial imaging and range resolution at oblique angles
Solution Approach 1:
The system separates the transmitter and receiver into independent components with independent positioning and orientation. This allows the transmitter to illuminate at one angle while the receiver detects at a different angle, enabling spatial imaging and range resolution without compromising signal strength
Solution Approach 2:
The patent introduces angular separation between transmitter and receiver orientations as a new degree of freedom. By operating in bistatic mode with different illumination and detection angles, the system achieves three-dimensional spatial imaging capability while maintaining strong signal returns from resonant structures
2Adaptability or versatility
If the transmitter illuminates at an oblique angle, then spatial imaging is enabled, but signal strength and resonance detection capability deteriorate
Solution Approach 1:
The system dynamically optimizes the combination of illumination angle and detection angle for each specific application scenario. The independent positioning of transmitter and receiver allows flexible adjustment of angles to balance spatial imaging requirements with signal strength requirements
3Device complexity
If the transmitter and receiver are co-located, then device complexity is reduced, but measurement precision and range discrimination capability are limited
Solution Approach 1:
The system divides the monostatic transceiver into separate transmitter and receiver components. This segmentation enables independent positioning and orientation of each component, providing geometric diversity that improves range discrimination and measurement precision in SAR and ISAR applications
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 high signal strength detection at oblique angles, facilitating spatial imaging and range resolution by decoupling the transmitter and receiver orientations, thereby extending the system's implementation configurations and improving range discrimination in SAR and ISAR applications.
Implementation Method 1
produces an enhanced or reduced backscattered radiation in one or more resonant frequency bands when illuminated with electromagnetic energy
Implementation Method 2
produces an enhanced or reduced backscattered radiation in one or more resonant frequency bands
Data Source
AI summary
A resonant structure includes a conductive surface layer on a dielectric layer that produces an enhanced or reduced backscattered radiation in one or more resonant frequency bands when illuminated with electromagnetic energy. A transmitter illuminates the resonant structure with the electromagnetic energy at a first angle relative to the normal of the conductive surface. A receiver is operable to detect the enhanced or reduced backscattered radiation at the resonant frequency bands at a second angle relative to the normal of the conductive surface. The second angle is different from the first angle by at least five degrees. A processor coupled to the receiver and is operable to detect data encoded in one or both of a frequency response and a polarization response of the resonant structure based on the detected enhanced or reduced backscattered radiation.