Modulated Slot Array for Microwave Imaging
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Solution Overview
Problem
Conventional non-destructive imaging techniques using electromagnetic radiation are inefficient, particularly at higher frequencies, due to the use of dipole antennas and bulky RF circuitry, which limits sensitivity and resolution.
Innovation Solution
An array of modulated slots is used to detect microwave and millimeter wave electromagnetic radiation, with each slot outputting a signal representative of the detected field and its location, allowing for high sensitivity, high spatial resolution, and real-time imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dipole antennas are used for field sampling, then the imaging system can operate at higher frequencies, but the sensitivity is insufficient
Solution Approach 1:
The patent changes the fundamental parameter of the sensing element from dipole antennas to slot antennas. Slot antennas provide inherently higher sensitivity for field sampling while maintaining compatibility with higher frequency operations, directly resolving the contradiction between sensitivity and high-frequency performance
Solution Approach 2:
The patent replaces the conventional dipole antenna mechanical structure with a slot antenna structure that is integrated into a planar array. This substitution enables both higher sensitivity and better high-frequency performance by utilizing the slot's inherent electromagnetic coupling characteristics
2Productivity
If switched antenna array techniques are used, then imaging can be performed, but expensive and bulky RF circuitry is required for each pickup antenna
Solution Approach 1:
The patent merges multiple antenna elements into a single planar slot array structure. Instead of requiring separate RF circuitry for each antenna element, the slots are arranged in a dense array that shares common signal processing infrastructure, dramatically reducing the complexity and cost of RF circuitry while maintaining imaging capability
Solution Approach 2:
The slot array structure serves multiple functions simultaneously: it acts as both the radiating element and the sensing element, and the entire array can be controlled by a single or few RF sources. This multi-functionality eliminates the need for expensive individual RF circuitry at each element location
3Measurement precision
If conventional switched antenna array imaging is used, then imaging can be achieved, but sufficient resolution is not provided, particularly at higher frequencies
Solution Approach 1:
The patent segments the continuous aperture into a dense array of discrete slot elements. This segmentation allows for sufficient sampling of the electromagnetic field at higher frequencies, providing the necessary spatial resolution while maintaining imaging capability through the coordinated operation of multiple closely-spaced slots
Solution Approach 2:
The patent transitions from conventional one-dimensional or sparse two-dimensional antenna arrangements to a dense two-dimensional slot array. This dimensional enhancement provides adequate sampling in both horizontal and vertical directions, achieving sufficient spatial resolution at higher frequencies
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 system achieves high measurement sensitivity and spatial resolution, enabling real-time imaging with portability and the ability to image objects at higher frequencies, including those concealed within dielectric materials.
Implementation Method 1
an array of sensor elements receives the electric field scattered by the object
Data Source
AI summary
A sensor array having a plurality of modulated slots for microwave and/or millimeter wave imaging. The locations of the slots in the array define a spatial domain away from an object for detecting an electric field from the object. Each of the slots outputs a signal representative of the measured field and the location of the slot. A processor decodes the signals and generates an image of the object.