Millimeter-Wave Imaging System With Antenna Arrays For Uncooperative Screening
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Solution Overview
Problem
Existing millimeter wave imaging systems for security checks require cooperative subjects, limiting efficiency and passenger convenience, especially in high-traffic areas like airports and subways, due to the need for standing still and specific postures, and passive systems suffer from low image quality.
Innovation Solution
An active millimeter wave imaging system with strategically arranged transmitting and receiving antenna arrays around an inspection channel, allowing for 360-degree scanning and multiple view imaging, enabling uncooperative subjects to pass through freely while maintaining high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive type millimeter wave imaging system is used, then the system structure is simple, but the image quality is poor due to low detector sensitivity
Solution Approach 1:
The patent introduces an active millimeter wave transmitting antenna array as an intermediary to illuminate the inspection channel. This external illumination source mediates between the simple passive detection system and the need for high image quality, enabling the passive detectors to capture sufficient signal for high-quality imaging without requiring complex active detectors at each antenna element.
2Device complexity
If active type millimeter wave imaging system with single antenna array is used, then the system structure is simple, but the scanning coverage is limited
Solution Approach 1:
The patent divides the antenna system into multiple independent antenna arrays positioned at different locations around the inspection channel. Each array segment covers a specific angular range, and the combined coverage of multiple segments achieves 360-degree scanning. This segmentation allows the system to maintain structural simplicity of individual arrays while achieving comprehensive coverage.
Solution Approach 2:
The patent transitions from a single-plane antenna array to a three-dimensional spatial arrangement of multiple antenna arrays positioned at different heights and angular positions around the inspection channel. This dimensional expansion enables comprehensive 360-degree scanning coverage while keeping each individual array relatively simple.
3Measurement precision
If existing active millimeter wave imaging system requiring cooperative posture is used, then the image quality is high, but the passenger throughput is reduced
Solution Approach 1:
The patent creates a dynamic scanning system where multiple antenna arrays sequentially illuminate different angular positions as the subject moves through the inspection channel. This dynamic illumination approach allows the system to maintain high image quality through comprehensive multi-angle scanning while the subject can walk through freely without stopping or assuming specific postures.
Solution Approach 2:
The patent implements continuous scanning coverage by positioning antenna arrays to overlap in their angular coverage ranges. As the subject moves through the channel, the useful scanning action continues uninterrupted from one antenna array to the next, maintaining high image quality throughout the entire passage without requiring the subject to pause or stop.
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 efficient and non-intrusive security checks with high image quality and increased passenger throughput by allowing subjects to move freely through the channel, suitable for high-traffic security screening.
Implementation Method 1
each millimeter wave transceiver module is able to scan the object when the conveyor conveys the object through the millimeter wave transceiving module
Data Source
Figure 1(A)
Figure 1(B)
Figure 2(A)~2(B)
AI summary
The present disclosure provides a millimeter wave imaging system. In an embodiment, the millimeter wave imaging system (100) may include: a first and a second millimeter wave transceiving antenna array (101, 105) respectively provided at two opposite sides of an inspection channel, wherein each millimeter wave transceiving antenna array includes a plurality of transmitting antenna units and a plurality of receiving antenna units arranged in an area array; and a millimeter wave transceiver (103, 107) configured to drive the transmitting antenna units and the receiving antenna units in the first and the second millimeter wave transceiving antenna arrays.