Electromagnetic Sub-Wavelength Imaging Using Signal Processing Techniques Combined With Phase Conjugation

TL;DR

This paper demonstrates how combining electromagnetic techniques with advanced signal processing algorithms, including phase conjugation, can achieve sub-wavelength imaging resolution in the microwave regime, surpassing traditional electromagnetic limits.

Contribution

It introduces novel combinations of EM and signal processing methods, such as CM and MRPSM, with phase conjugation to enhance sub-wavelength imaging resolution.

Findings

Achieved sub-wavelength resolution of λ0/10

Effective imaging even outside near-field region

Compared computational efficiencies of algorithms

Abstract

In this paper, we show how we can combine Electromagnetics (EM) with signal processing algorithms to enhance the image resolution over that can be realized by using Electromagnetics techniques alone. We discuss several signal processing techniques, including the Correlation Method (CM) and the Minimum Residual Power Search Method (MRPSM), and apply them for sub-wavelength imaging in the microwave regime by combining them with the well-known Phase Conjugation (PC) algorithm, for instance, which has been extensively used in the electromagnetics area for imaging purposes. We show that by using this type of combination we can achieve sub-wavelength resolution on the order of {\lambda}0/10, even if 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. We also study their computational efficiencies in a comparative manner.