Istanbul Technical University Electromagnetic Research Group

Information Founded in 1990 Research on Reconstruction Methodologies Main Attention on Imaging of the Inaccessible Objects International Collaborations Numerous Publications

Research Subjects Scattering from rough surfaces Scattering from bodies buried under a rough surface Imaging of rough surfaces Imaging of bodies buried under rough surfaces Imaging of perfectly conducting objects Imaging of dielectric objects Surface impedance reconstruction Detection and location of dielectric objects

Projects RECONSTRUCTION OF GEOMETRICAL AND MATERIAL PROPERTIES OF THE OBJECTS BURIED UNDER A ROUGH SURFACE THROUGH ELECTROMAGNETIC WAVES (Supported by TUBITAK)

Recent Publications Iterative reconstruction of dielectric rough surface profiles at fixed frequency Ibrahim Akduman, Rainer Kress and Ali Yapar, “Iterative reconstruction of dielectric rough surface profiles at fixed frequency”, accepted by Inverse Problems On the Scattering of Electromagnetic Waves by Bodies Buried in a Half-Space With Locally Rough Interface Yasemin Altuncu, Ali Yapar, and Ibrahim Akduman, “On the Scattering of Electromagnetic Waves by Bodies Buried in a Half-Space With Locally Rough Interface”, IEEE Transactions on Geoscience and Remote Sensing. One-Dimensional Pro¯le Inversion of a Cylindrical Layer with Inhomogeneous Impedance Boundary: A Newton-Type Ali Yapar, Hulya Sahinturk, Ibrahim Akduman and Rainer Kress, “One-Dimensional Pro¯le Inversion of a Cylindrical Layer with Inhomogeneous Impedance Boundary: A Newton-Type Iterative Solution Iterative Solution”, accepted by IEEE Transactions on Geoscience and Remote Sensing. On the Scattering of Electromagnetic Waves by Bodies Buried in a Half-space with Rough Interface Yasemin Altuncu, Ali Yapar and Ibrahim Akduman, “On the Scattering of Electromagnetic Waves by Bodies Buried in a Half-space with Rough Interface”, accepted by IEEE Transactions on Geoscience and Remote Sensing. A Newton Method for the Reconstruction of Perfectly Conducting Slightly Rough Surface Profiles Ali Yapar, Ozgur Ozdemir, Hulya Sahinturk, and Ibrahim Akduman, “A Newton Method for the Reconstruction of Perfectly Conducting Slightly Rough Surface Profiles”, accepted by IEEE Transactions on Antennas and Propagation

Laboratory Free Space Imaging System

Free Space Imaging System Laboratory ( Free Space Imaging System ) Research and Experiment Areas Design of High Resolution Microwave Imaging Systems Development of Novel Computational Electromagnetic Methods and Applications Electromagnetic Compability Tests (EMC) Antenna Design and Measurements

Free Space Imaging System Laboratory (Free Space Imaging System) General Infrastructure Inn-co Controller Co 1000 Agilent Tech. N5230A PNA Series Network Analyzer (10MHz-40GHz) Hewlett Packard E4431B ESG-D Series Signal Generator Hewlett Packard 83732B Synthesized Signal Generator Agilent Tech. E7405A EMC Analyzer (100Hz-26.5GHz) 2x Schwarzbeck BBHA 9120D Horn Antenna 2x Schwarzbeck BBHA 9120A Horn Antenna Turn Table 8564E Spectrum Analyzer 85671A Phase Noise Meas Util 54616B/ABA Oscilloscope 2GS/s sample 54657A/ABA HP1B storage module 10098A Front panel+pouch...

Laboratory

First Experiments started to be made under a basic configuration An empty copper cylinder Frequency = 3 GHz Diameter of cylinder (target) = 12 cm Distance (From antennas to target) = 1m

First Experimental Results The measured data for magnitude of the scattered field and the one for the analytical solution

First Experimental Results The measured data for phase of the scattered field and the one for the analytical solution

First Experimental Results The Reconstruction of the target

CONTACT Director Ibrahim Akduman, Ph.D. Professor Phone: Fax: Ali Yapar, Ph.D. Associate Professor Phone: Fax: