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Advances in Microwave Near-Field Imaging: Prototypes, Systems, and Applications
1Johns Hopkins University, Baltimore, Maryland, United States.
IEEE Microwave Magazine
|June 25, 2021
Summary
Microwave imaging uses electromagnetic waves to detect hidden objects. Recent advances enable short-range applications like medical imaging and security screening.
Area of Science:
- Physics
- Electrical Engineering
- Electromagnetics
Background:
- Microwave imaging utilizes electromagnetic (EM) waves (300 MHz-300 GHz) for detecting objects within structures or media.
- Traditionally associated with far-field radar applications like target tracking and weather surveillance.
- Microwaves' penetration capability enables emerging short-range applications.
Purpose of the Study:
- To explore the principles and applications of microwave imaging.
- To highlight the shift towards near-field imaging techniques.
- To detail the factors influencing near-field microwave detection.
Main Methods:
- Detection techniques using EM waves in the microwave spectrum.
- Analysis of far-field applications (e.g., radar, surveillance).
- Investigation of short-range applications (e.g., medical, NDT, security).
Main Results:
- Microwave imaging is effective for evaluating hidden or embedded objects.
- Short-range applications leverage microwave penetration through opaque media.
- Near-field imaging is crucial for detecting object profiles at close distances.
Conclusions:
- Microwave imaging offers versatile object detection capabilities.
- The field is expanding into critical short-range applications.
- Near-field imaging performance depends on sensor-object proximity and electrical characteristics.
