Simplified two‐dimensional microwave imaging scheme using metamaterial‐loaded Vivaldi antenna

In this paper, a highly efficient, low-cost scheme for two-dimensional microwave imaging is proposed. To this end, the AZIM (anisotropic zero index metamaterial) cell-loaded Vivaldi antenna is designed and tested as effective electromagnetic radiation beam source required in the microwave imaging scheme. The designed antenna is first individually tested in the anechoic chamber, and its directivity along with the radiation pattern is obtained. The measurement setup for the imaging here involves a vector network analyzer, the AZIM cell-loaded ultra-wideband Vivaldi antenna, and other associated microwave components. The potential of the designed antenna for the microwave imaging is tested by first obtaining the two-dimensional reflectivity images of metallic samples of different shapes placed in front of the antenna, using the proposed scheme. In the next step, these sets of samples are hidden behind wooden blocks of different thicknesses and the reflectivity image of the test media is reconstructed by using the proposed scheme. Finally, the reflectivity images of various dielectric samples (Teflon, Plexiglas, permanent magnet moving coil) along with the copper sheet placed on a piece of cardboard are reconstructed by using the proposed setup. The images obtained for each case are plotted and compared with the actual objects, and a close match is observed which shows the applicability of the proposed scheme for through-wall imaging and the detection of concealed objects.

[1]  Guanghua Li,et al.  Frequency Dependence of Image Reconstruction of Linear Sampling Method in Electromagnetic Inverse Scattering , 2010 .

[2]  Abbas Omar,et al.  Reconstructing permittivity profiles using integral transforms and improved renormalization techniques , 2000 .

[3]  Guang-Ming Wang,et al.  Directivity Improvement of Vivaldi Antenna Using Double-Slot Structure , 2013, IEEE Antennas and Wireless Propagation Letters.

[4]  A. Kirsch.  The factorization method for Maxwell's equations , 2004 .

[5]  Lotfollah Shafai,et al.  Design and performance analysis of the miniaturised water-filled double-ridged horn antenna for active microwave imaging applications , 2015 .

[6]  M. Jaleel Akhtar,et al.  Design of anisotropic zero-index metamaterial loaded tapered slot vivaldi antenna for microwave imaging , 2014, 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI).

[7]  P. J. Gibson.  The Vivaldi Aerial , 1979, 1979 9th European Microwave Conference.

[8]  A. Kirsch,et al.  A simple method for solving inverse scattering problems in the resonance region , 1996 .

[9]  M. Eskandari,et al.  Microwave imaging of two-dimensional objects using an enhancement method , 2015 .

[10]  M. Hesaaraki,et al.  The singular sources method for an inverse problem with mixed boundary conditions , 2005 .

[11]  Md. Delwar Hossain,et al.  Coherent time‐reversal microwave imaging for the detection and localization of breast tissue malignancies , 2015 .

[12]  Gian Luigi Gragnani,et al.  Vivaldi Antennas for Microwave Imaging: Theoretical Analysis and Design Considerations , 2006, IEEE Transactions on Instrumentation and Measurement.

[13]  R. Benjamin,et al.  A Comparison of a Wide-Slot and a Stacked Patch Antenna for the Purpose of Breast Cancer Detection , 2010, IEEE Transactions on Antennas and Propagation.

[14]  Daniele Trinchero,et al.  Localization, tracking, and imaging of targets in wireless sensor networks: An invited review , 2011 .

[15]  D. Colton,et al.  The linear sampling method in inverse electromagnetic scattering theory , 2003 .

[16]  T. Cui,et al.  Directivity Enhancement to Vivaldi Antennas Using Compactly Anisotropic Zero-Index Metamaterials , 2011, IEEE Antennas and Wireless Propagation Letters.

[17]  A. Litman,et al.  A large 3D target with small inner details: A difficult cocktail for imaging purposes without a priori knowledge on the scatterers geometry , 2012 .

[18]  Ashutosh Kumar,et al.  Microwave Imaging of Stratified Media From Band-Limited Reflection Coefficient Data , 2014, IEEE Geoscience and Remote Sensing Letters.

[19]  Qiang Cheng,et al.  Coding metamaterials, digital metamaterials and programmable metamaterials , 2014, Light: Science & Applications.

[20]  Qiang Cheng,et al.  Radiation of planar electromagnetic waves by a line source in anisotropic metamaterials , 2010 .

[21]  Xiang Wan,et al.  Transmission-Type 2-Bit Programmable Metasurface for Single-Sensor and Single-Frequency Microwave Imaging , 2016, Scientific Reports.

[22]  Hong-qiang Li,et al.  Enhancement of (nearly) homogeneous fields in a (effective) zero-index cavity , 2011 .

[23]  M. Pastorino.  Applications of Microwave Imaging , 2010 .

[24]  Xianming Qing,et al.  Gain Enhancement of 60-GHz Antipodal Tapered Slot Antenna Using Zero-Index Metamaterial , 2013, IEEE Transactions on Antennas and Propagation.

[25]  M. Jaleel Akhtar,et al.  Time domain microwave technique for dielectric imaging of multi-layered media , 2015 .

[27]  D. Smith,et al.  Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients , 2001, physics/0111203.

[28]  Jeremie Bourqui,et al.  Balanced Antipodal Vivaldi Antenna With Dielectric Director for Near-Field Microwave Imaging , 2010, IEEE Transactions on Antennas and Propagation.

[29]  Kambiz K. Moez,et al.  A 324-Element Vivaldi Antenna Array for Radio Astronomy Instrumentation , 2012, IEEE Transactions on Instrumentation and Measurement.

[30]  Fernando L. Teixeira,et al.  Time‐reversal techniques for MISO and MIMO wireless communication systems , 2012 .

[31]  Jerzy Kowalewski,et al.  Broadband miniaturised bow-tie antenna for 3D microwave tomography , 2014 .

[32]  Stewart,et al.  Extremely low frequency plasmons in metallic mesostructures. , 1996, Physical review letters.

[33]  Jin Au Kong,et al.  Robust method to retrieve the constitutive effective parameters of metamaterials. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.