Subwavelength negative index planar terahertz metamaterial arrays using spiral split ring resonators for near field sensing

Samsuzzaman

Kibria

et al. 2019

Sci Rep

In this paper, the design consideration is investigated for a cylindrical system with low-cost and low-loss dielectric materials for the detection of breast tumor using iteratively corrected delay multiply and sum (IC- DMAS) algorithm. Anomaly in breast tissue is one of the most crucial health issues for women all over the world today. Emergency medical imaging diagnosis can be harmlessly managed by microwave-based analysis technology. Microwave Imaging (MI) has been proved to be a reliable health monitoring approach that can play a fundamental role in diagnosing anomaly in breast tissue. An array of 16 high gain microstrip antennas loaded by Index Near-Zero (INZ) metasurfaces (MS), having the impedance bandwidth of 8.5 GHz (2.70–11.20 GHz) are used as transceivers for the system. The MS is used to increase the electrical length of the signal that results in the gain enhancements. The antennas are mounted in a cylindrical arrangement on a mechanical rotating table along with a phantom mounting podium. A non-reflective positive control switching matrix is used for transmitting and receiving microwave signals. A set of lab-made realistic heterogeneous breast phantoms containing skin, fat, glandular, and tumor tissue dielectric properties in individual layers are used to verify the performance of the proposed technique. The control of the mechanical unit, data collection, and post-processing is conducted via MATLAB. The system can detect multiple tumor objects. The imaging results and numerical Signal to Mean Ratio (SMR) values of the experiment validate the system efficiency and performance that can be a viable solution for tumor detections.

Section: Introductionmentioning

confidence: 99%

Metasurface Loaded High Gain Antenna based Microwave Imaging using Iteratively Corrected Delay Multiply and Sum Algorithm

Samsuzzaman

Kibria

et al. 2019

Sci Rep

“…Pendry proposed a metamaterial having split ring resonator (SRR) structure [24] in 1999 and, eventually, Smith performed the demonstration and justification of metamaterial perception in 2000 [25]. In the meantime, various left-handed metamaterials are reported using different structures, like fishnet structures [26], SRRs [27], multiple SRRs [28], layouts of transmission line [29], double-sided SRRs [30], spiral SRRs [31], H-shaped pairs periodic arrays [32], cut wire pairs [33], SRR pairs [34], double-bowknot-shaped resonators [35], and broadside-coupled SRRs [36]. The spectrum and range of the unit cell is curbed due to having a narrow frequency band and, therefore, being not easy to implement in the antenna, as well as fabricate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Breast Phantom Imaging with Metamaterial-Inspired Nine-Antenna Sensor Array

Samsuzzaman

et al. 2018

Sensors

An experimental system for early screening of a breast tumor is presented in this article. The proposed microwave imaging (MI) system consists of a moveable array of nine improved negative-index metamaterial (MTM)-loaded ultrawideband (UWB) antenna sensor with incorporation of a corresponding SRR (split-ring resonator) and CLS (capacitively loaded strip) structure, in a circular array, the stepper motor-based array-mounting stand, the adjustable phantom hanging platform, an RF switching system to control the receivers, and a personal computer-based signal processing and image reconstruction unit using MATLAB. The improved antenna comprises of four-unit cells along one axis, where an individual unit cell integrates a balancing SRR and CLS pair, which makes the antenna radiation omnidirectional over the operating frequencies. The electrical dimensions of this proposed antenna are 0.28λ × 0.20λ × 0.016λ, measured at the lowest operating frequency of 2.97 GHz as the operating bandwidth of this is in between 2.97–15 GHz (134.82% bandwidth), with stable directional radiation pattern. SP8T 8 port switch is used to enable the eight receiver antennas to sequentially send a 3–8.0 GHz microwave signal to capture the backscattered signal by MATLAB software. A low-cost realistic homogeneous breast phantom with tumor material is developed and measured to test the capability of the imaging system to detect the breast tumors. A post-processing delay-multiply-and-sum (DMAS) algorithm is used to process the recorded backscatter signal to get an image of the breast phantom, and to accurately identify the existence and located area of multiple breast tumor tissues.

Int J RF and Microwave Comp Aid Eng

“…Substrate applications of metamaterials is a fast-developing area in Applied Electromagnetics [1][2][3][4][5][6]. One of the most popular subjects of this area is regarded to antennas applications.…”

Section: Introductionmentioning

confidence: 99%

Profile miniaturization and performance improvement of a rectangular patch antenna using magnetic metamaterial substrates

Rybin

Shulga

2016

The idea of profile miniaturization and performance improvement of a rectangular patch antenna using a metamaterial substrate with large values in the real part of effective relative permeability is proposed in microwave frequency range. The volume profile of the antenna is minimized by tuning the effective relative permeability and thickness of the substrate material. The specific type of metamaterial which can be used as substrate material for the antenna miniaturization purpose is suggested. The proposed idea is validated through finite-difference time-domain (FDTD) simulations for sample rectangular patch antennas with metamaterial substrates at the frequency about 10 GHz. Improvement of the power directivity is found for the metamaterial substrate with large value in the real part of effective permeability. V C 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:254-261, 2016.