scholarly journals A Miniaturized Antenna with Negative Index Metamaterial Based on Modified SRR and CLS Unit Cell for UWB Microwave Imaging Applications

Materials ◽  
2015 ◽  
Vol 8 (2) ◽  
pp. 392-407 ◽  
Author(s):  
Md. Islam ◽  
Mohammad Islam ◽  
Md. Samsuzzaman ◽  
Mohammad Faruque ◽  
Norbahiah Misran ◽  
...  
Keyword(s):  
Microwave Imaging ◽  
Unit Cell ◽  
Negative Index ◽  
Miniaturized Antenna

scholarly journals A Negative Index Metamaterial to Enhance the Performance of Miniaturized UWB Antenna for Microwave Imaging Applications

2017 ◽  
Vol 7 (11) ◽  
pp. 1149 ◽  
Author(s):  
Md. Mahmud ◽  
Mohammad Islam ◽  
Norbahiah Misran ◽  
Mandeep Singh ◽  
Kamarulzaman Mat
Keyword(s):  
Microwave Imaging ◽  
Negative Index ◽  
Uwb Antenna

A negative index metamaterial antenna for UWB microwave imaging applications

2015 ◽  
Vol 57 (6) ◽  
pp. 1352-1361 ◽  
Author(s):  
M. M. Islam ◽  
M. T. Islam ◽  
M. Samsuzzaman ◽  
M. R. I. Faruque
Keyword(s):  
Microwave Imaging ◽  
Negative Index ◽  
Metamaterial Antenna

scholarly journals A Negative Index Metamaterial-Inspired UWB Antenna with an Integration of Complementary SRR and CLS Unit Cells for Microwave Imaging Sensor Applications

Sensors ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 11601-11627 ◽  
Author(s):  
Mohammad Islam ◽  
Md. Islam ◽  
Md. Samsuzzaman ◽  
Mohammad Faruque ◽  
Norbahiah Misran
Keyword(s):  
Microwave Imaging ◽  
Negative Index ◽  
Uwb Antenna ◽  
Sensor Applications ◽  
Unit Cells ◽  
Imaging Sensor

scholarly journals A Negative Index Nonagonal CSRR Metamaterial-Based Compact Flexible Planar Monopole Antenna for Ultrawideband Applications Using Viscose-Wool Felt

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2819
Author(s):  
Kabir Hossain ◽  
Thennarasan Sabapathy ◽  
Muzammil Jusoh ◽  
Mahmoud A. Abdelghany ◽  
Ping Jack Soh ◽  
...  
Keyword(s):  
Cellulose Fiber ◽  
Unit Cell ◽  
Monopole Antenna ◽  
Regenerated Cellulose ◽  
Negative Index ◽  
Cell Array ◽  
Polymer Adhesion ◽  
Lc Resonator ◽  
Planar Monopole Antenna ◽  
Regenerated Cellulose Fiber

In this paper, a compact textile ultrawideband (UWB) planar monopole antenna loaded with a metamaterial unit cell array (MTMUCA) structure with epsilon-negative (ENG) and near-zero refractive index (NZRI) properties is proposed. The proposed MTMUCA was constructed based on a combination of a rectangular- and a nonagonal-shaped unit cell. The size of the antenna was 0.825 λ0 × 0.75 λ0 × 0.075 λ0, whereas each MTMUCA was sized at 0.312 λ0 × 0.312 λ0, with respect to a free space wavelength of 7.5 GHz. The antenna was fabricated using viscose-wool felt due to its strong metal–polymer adhesion. A naturally available polymer, wool, and a human-made polymer, viscose, that was derived from regenerated cellulose fiber were used in the manufacturing of the adopted viscose-wool felt. The MTMUCA exhibits the characteristics of ENG, with a bandwidth (BW) of 11.68 GHz and an NZRI BW of 8.5 GHz. The MTMUCA was incorporated on the planar monopole to behave as a shunt LC resonator, and its working principles were described using an equivalent circuit. The results indicate a 10 dB impedance fractional bandwidth of 142% (from 2.55 to 15 GHz) in simulations, and 138.84% (from 2.63 to 14.57 GHz) in measurements obtained by the textile UWB antenna. A peak realized gain of 4.84 dBi and 4.4 dBi was achieved in simulations and measurements, respectively. A satisfactory agreement between simulations and experiments was achieved, indicating the potential of the proposed negative index metamaterial-based antenna for microwave applications.

Negative-Index Metamaterials: Looking into the Unit Cell

Nano Letters ◽  
2010 ◽  
Vol 10 (7) ◽  
pp. 2480-2483 ◽  
Author(s):  
Matteo Burresi ◽  
Daniela Diessel ◽  
Dries van Oosten ◽  
Stefan Linden ◽  
Martin Wegener ◽  
...  
Keyword(s):  
Unit Cell ◽  
Negative Index

scholarly journals Design of Miniaturized Antenna Array for Microwave Imaging Application

2021 ◽  
Vol 1055 (1) ◽  
pp. 012058
Author(s):  
V Ramkumar ◽  
A Balaji ◽  
V Chinnammal ◽  
S Vanaja ◽  
C Malarvizhi
Keyword(s):  
Antenna Array ◽  
Microwave Imaging ◽  
Imaging Application ◽  
Miniaturized Antenna

High-resolution structure determination by ALCHEMI

1983 ◽  
Vol 41 ◽  
pp. 178-181 ◽  
Author(s):  
Peter G. Self ◽  
Peter R. Buseck
Keyword(s):  
Site Occupancy ◽  
Real Space ◽  
Unit Cell ◽  
Bragg Angle ◽  
Electron Current ◽  
High Resolution Structure ◽  
Beam Incident ◽  
Crystallographic Planes ◽  
Electron Beam Incident ◽  
Resolution Structure

ALCHEMI (Atom Location by CHanneling Enhanced Microanalysis) enables the site occupancy of atoms in single crystals to be determined. In this article the fundamentals of the method for both EDS and EELS will be discussed. Unlike HRTEM, ALCHEMI does not place stringent resolution requirements on the microscope and, because EDS clearly distinguishes between elements of similar atomic number, it can offer some advantages over HRTEM. It does however, place certain constraints on the crystal. These constraints are: a) the sites of interest must lie on alternate crystallographic planes, b) the projected charge density on the alternate planes must be significantly different, and c) there must be at least one atomic species that lies solely on one of the planes.An electron beam incident on a crystal undergoes elastic scattering; in reciprocal space this is seen as a diffraction pattern and in real space this is a modulation of the electron current across the unit cell. When diffraction is strong (i.e., when the crystal is oriented near to the Bragg angle of a low-order reflection) the electron current at one point in the unit cell will differ significantly from that at another point.

The External Shape of Human γ GI Immunoglobulin from Crystal Sections

1971 ◽  
Vol 29 ◽  
pp. 428-429
Author(s):  
L. W. Labaw
Keyword(s):  
Molecular Weight ◽  
Sodium Phosphate ◽  
Osmium Tetroxide ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
X Ray ◽  
Large Molecular Weight ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Crystallographic Axes

Crystals of a human γGl immunoglobulin have the external morphology of diamond shaped prisms. X-ray studies have shown them to be monoclinic, space group C2, with 2 molecules per unit cell. The unit cell dimensions are a = 194.1, b = 91.7, c = 51.6Å, 8 = 102°. The relatively large molecular weight of 151,000 and these unit cell dimensions made this a promising crystal to study in the EM.Crystals similar to those used in the x-ray studies were fixed at 5°C for three weeks in a solution of mother liquor containing 5 x 10-5M sodium phosphate, pH 7.0, and 0.03% glutaraldehyde. They were postfixed with 1% osmium tetroxide for 15 min. and embedded in Maraglas the usual way. Sections were cut perpendicular to the three crystallographic axes. Such a section cut with its plane perpendicular to the z direction is shown in Fig. 1.This projection of the crystal in the z direction shows periodicities in at least four different directions but these are only seen clearly by sighting obliquely along the micrograph.

The orientation of sickle hemoglobin fibers within fascicles

1988 ◽  
Vol 46 ◽  
pp. 400-401
Author(s):  
Christopher A. Miller ◽  
Bridget Carragher ◽  
William A. McDade ◽  
Robert Josephs
Keyword(s):  
Sickle Cell ◽  
Sickle Cell Anemia ◽  
Relative Orientation ◽  
Unit Cell ◽  
Red Cell ◽  
High Ph ◽  
Sickle Hemoglobin ◽  
Polar Crystal ◽  
Helical Configuration

Highly ordered bundles of deoxyhemoglobin S (HbS) fibers, termed fascicles, are intermediates in the high pH crystallization pathway of HbS. These fibers consist of 7 Wishner-Love double strands in a helical configuration. Since each double strand has a polarity, the odd number of double strands in the fiber imparts a net polarity to the structure. HbS crystals have a unit cell containing two double strands, one of each polarity, resulting in a net polarity of zero. Therefore a rearrangement of the double strands must occur to form a non-polar crystal from the polar fibers. To determine the role of fascicles as an intermediate in the crystallization pathway it is important to understand the relative orientation of fibers within fascicles. Furthermore, an understanding of fascicle structure may have implications for the design of potential sickling inhibitors, since it is bundles of fibers which cause the red cell distortion responsible for the vaso-occlusive complications characteristic of sickle cell anemia.

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