Application of Signal Processing Techniques to Electromagnetic Sub-Wavelength Imaging

  • Raj Mittra
  • Xiang Gu
  • Chiara Pelletti


Sub-wavelength imaging, aka Superlensing, is the so-called “holy grail” of imaging, which has been extensively researched by many investigators, who have attempted to achieve it by using Metamaterials—specifically double negative (DNG) materials—Transformation Optics (TO)-based designs, Phase Conjugation(PC), and a number of other techniques. Unfortunately, however, the success to-date in this enterprise has been rather limited, and the search for achieving super-resolution still continues unabated.

In this chapter we show how we can combine Electromagnetics with Signal Processing algorithms to achieve the goal of enhancing the image resolution over that we can realize by using EM techniques alone. We discuss several signal processing techniques, including the Correlation Method (CM), Maximum Search and Removal Method (MSRM), System Matrix Method (SMM), etc., and apply them for sub-wavelength imaging in the microwave regime by combining them with the well-known Phase Conjugation method, for instance, which has been extensively used in the EM area for imaging purposes. We show that by using this type of combination we can achieve sub-wavelength resolution even when the measurement plane is not located in the very near-field region of the source. We describe the proposed imaging algorithms in detail and study their abilities to resolve at sub-wavelength level, their sensitivities to noise, and their computational efficiencies in a comparative manner.


Compressive Sensing Correlation Method Measurement Plane Aperture Size Phase Conjugation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.EMC Laboratory, Department of Electrical EngineeringPennsylvania State UniversityUniversity ParkUSA
  2. 2.Key Laboratory of Microwave Remote SensingChinese Academy of SciencesBeijingChina
  3. 3.Centre for Space Science and Applied ResearchChinese Academy of SciencesBeijingChina

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