Direct sampling method for anomaly imaging from S-parameter

TL;DR

This paper introduces a rapid imaging technique using direct sampling for detecting small anomalies in homogeneous media based on S-parameter data, with theoretical analysis and simulation validation.

Contribution

The paper presents a novel direct sampling method that links S-parameters to Bessel functions for efficient anomaly imaging.

Findings

Effective imaging of small anomalies demonstrated at 1GHz

The indicator function structure is supported by simulation results

The method offers a fast alternative to existing techniques

Abstract

In this paper, we develop a fast imaging technique for small anomalies located in homogeneous media from S-parameter data measured at dipole antennas. Based on the representation of S-parameters when an anomaly exists, we design a direct sampling method (DSM) for imaging an anomaly and establishing a relationship between the indicator function of DSM and an infinite series of Bessel functions of integer order. Simulation results using synthetic data at f=1GHz of angular frequency are illustrated to support the identified structure of the indicator function.