Single-layer multiband ring microstrip antennas fed by a co-planar waveguide

2013 ◽  
Author(s):  
Hiroshi Wakatsuki ◽  
Yuichi Kimura ◽  
Misao Haneishi
Keyword(s):  
Planar Waveguide ◽  
Single Layer ◽  
Microstrip Antennas

scholarly journals Single-Layer Line-Fed Broadband Microstrip Patch Antenna on Thin Substrates

Electronics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 37
Author(s):  
Roberto Vincenti Gatti ◽  
Riccardo Rossi ◽  
Marco Dionigi
Keyword(s):  
Patch Antenna ◽  
State Of The Art ◽  
Low Cost ◽  
Single Layer ◽  
Microstrip Antennas ◽  
Microstrip Patch Antenna ◽  
Layer Line ◽  
Limited Bandwidth ◽  
Microstrip Patch ◽  
Effective Design

In this work, the issue of limited bandwidth typical of microstrip antennas realized on a single thin substrate is addressed. A simple yet effective design approach is proposed based on the combination of traditional single-resonance patch geometries. Two novel shaped microstrip patch antenna elements with an inset feed are presented. Despite being printed on a single-layer substrate with reduced thickness, both radiators are characterized by a broadband behavior. The antennas are prototyped with a low-cost and fast manufacturing process, and measured results validate the simulations. State-of-the-art performance is obtained when compared to the existing literature, with measured fractional bandwidths of 3.71% and 6.12% around 10 GHz on a 0.508-mm-thick Teflon-based substrate. The small feeding line width could be an appealing feature whenever such radiating elements are to be used in array configurations.

scholarly journals Lossy Mode Resonance-Based Glucose Sensor with High-κ Dielectric Film

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 450
Author(s):  
Lin ◽  
Chen ◽  
Chiu
Keyword(s):  
Indium Tin Oxide ◽  
Planar Waveguide ◽  
Simple Structure ◽  
Glucose Sensor ◽  
Single Layer ◽  
Dielectric Surface ◽  
Experimental Investigations ◽  
The Past ◽  
Optical Planar Waveguide ◽  
Sensing Characteristics

In the past, high-κ dielectrics gained much attention because of the constant demand for increasingly smaller semiconductors. At the same time, in the field of optical sensing, high-κ dielectrics are key materials. This study presents the experimental investigations on a lossy mode resonance-based optical planar waveguide (LMROPW) sensor coated with a high-κdielectric of an indium tin oxide (ITO) layer. Two types of sensing structures were fabricated by coating (i) only a single-layer ITO (or bared LMROPW) and (ii) an ITO layer with glucose probes onto the optical planar waveguide (or boronic LMROPW) to detect glucose molecules. The sensing characteristics of these two types of sensors toward the surrounding analyte were determined using different concentrations of glucose solutions. It was found that the bared LMROPW sensor is only suitable for a higher concentration of glucose; the boronic LMROPW sensor with glucose probes on ITO could be applied to a lower-concentration solution to monitor glucose adsorption onto the sensing surface. Furthermore, with the advantages of a simple structure, easy alignment, and suitable production, the LMROPW sensor with a high-κ dielectric surface could be applied in clinical testing and diagnostics.

Improving the performances of triangular microstrip antenna with multilayered configuration

2013 ◽  
Vol 33 (1/2) ◽  
pp. 337-354 ◽  
Author(s):  
Ouarda Barkat
Keyword(s):  
Integral Equation ◽  
Electric Field ◽  
Microstrip Antenna ◽  
Single Layer ◽  
Microstrip Antennas ◽  
Air Gap ◽  
Air Separation ◽  
Method Of Moment ◽  
Content Type ◽  
Cover Layer

Purpose – An improved analytical model is presented to investigate the scattering properties of high Tc superconducting triangular antennas in multilayered configuration. The spectral method is used to study the scattering properties of superconducting triangular antennas. Galerkin method is used in the resolution of the electric field integral equation. The boundary condition for the electric field was used to derive an integral equation for the electric current. To validate the theoretical results, a study has been performed for perfectly conducting triangular patch on a single layer, with air gap, and cover layer. The computed data are found to be in good agreement. The paper aims to discuss these issues. Design/methodology/approach – A spectral domain approach has been used for the numerical calculation of the characteristics of a high Tc superconducting microstrip antenna with an air gap and cover layer. Initially, the authors use an integral method of moment which enabled them to exploit the spectral tensor of green. The resolution of the integral equations of the electric field by the procedure of Galerkin makes it possible to lead to a system of equations homogenous. The authors have calculated the frequency of resonance and the radiation pattern of antenna. Findings – The properties of the HTSTMA structure were stable at temperatures slightly lower than the critical temperature. Also computations show that the air separation can be adjusted to have the maximum operating frequency of the superconducting microstrip antenna. On the other hand, the bandwidth increases monotonically with increasing the air gap width. Therefore, HTS materials do offer efficiency improvements for antenna systems that can accommodate the added constraints of the superconducting environment. The calculated results have been compared with measured one available in the literature and excellent agreement has been found. Originality/value – To the best of the authors' knowledge, this subject has not been reported in the open literature; the only published results on the analysis of perfectly conducting triangular microstrip antennas.

Crystalline order to a resolution of 4.7 A in the sheath of Methanospirilium hungatii: A cross-beta structure

1984 ◽  
Vol 42 ◽  
pp. 214-215
Author(s):  
Murray Stewart ◽  
T.J. Beveridge ◽  
D. Sprott
Keyword(s):  
Cell Wall ◽  
Single Layer ◽  
Uranyl Acetate ◽  
Optical Diffraction ◽  
Tube Axis ◽  
Basic Subunit ◽  
Beta Structure ◽  
Diffraction Patterns ◽  
Protein Treatment ◽  
General Appearance

The archaebacterium Methanospirillum hungatii has a sheath as part of its cell wall which is composed mainly of protein. Treatment with dithiothreitol or NaOH released the intact sheaths and electron micrographs of this material negatively stained with uranyl acetate showed flattened hollow tubes, about 0.5 μm diameter and several microns long, in which the patterns from the top and bottom were superimposed. Single layers, derived from broken tubes, were also seen and were more simply analysed. Figure 1 shows the general appearance of a single layer. There was a faint axial periodicity at 28.5 A, which was stronger at irregular multiples of 28.5 A (3 and 4 times were most common), and fine striations were also seen at about 3° to the tube axis. Low angle electron diffraction patterns (not shown) and optical diffraction patterns (Fig. 2) from these layers showed a complex meridian (as a result of the irregular nature of the repeat along the tube axis) which showed a clear maximum at 28.5 A, consistent with the basic subunit spacing.

Differentiation Processes of the Ocellar Retina of the Honeybee (Apis Mellifera L.)

1990 ◽  
Vol 48 (3) ◽  
pp. 430-431
Author(s):  
Maria Anna Pabst
Keyword(s):  
Apis Mellifera ◽  
Distal Part ◽  
Cell Layer ◽  
Single Layer ◽  
Photoreceptor Cells ◽  
Distal Segment ◽  
Compound Eyes ◽  
Thin Sections ◽  
Ultrastructural Studies ◽  
Adult Worker

In addition to the compound eyes, honeybees have three dorsal ocelli on the vertex of the head. Each ocellus has about 800 elongated photoreceptor cells. They are paired and the distal segment of each pair bears densely packed microvilli forming together a platelike fused rhabdom. Beneath a common cuticular lens a single layer of corneagenous cells is present.Ultrastructural studies were made of the retina of praepupae, different pupal stages and adult worker bees by thin sections and freeze-etch preparations. In praepupae the ocellar anlage consists of a conical group of epidermal cells that differentiate to photoreceptor cells, glial cells and corneagenous cells. Some photoreceptor cells are already paired and show disarrayed microvilli with circularly ordered filaments inside. In ocelli of 2-day-old pupae, when a retinogenous and a lentinogenous cell layer can be clearly distinguished, cell membranes of the distal part of two photoreceptor cells begin to interdigitate with each other and so start to form the definitive microvilli. At the beginning the microvilli often occupy the whole width of the developing rhabdom (Fig. 1).

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