The authors introduce two flat graded-index (GRIN) lens designs in this study. First of these is a thick lens, which was designed and fabricated by using the three-dimensional (3D)-printing technique. Second, thin dial-a-dielectric (DaD) uses state-of-the-art artificially engineered dielectric materials for design they present only simulated results, with plans to fabricate it future. Both overcome difficulties faced finding desired commercial off-the-shelf materials, either 3D-printing or...

This article presents the designs of ultrawideband microwave flat gradient index (GRIN) lenses, which realizes over a 108% fractional bandwidth (12-40 GHz). The frequency-independent ray optics method is employed to determine radially varying permittivity profile lenses. challenge realizing such and limitations in dielectric material choices are overcome by two additive-manufacturing-aided approaches: 1) partially infilled dielectrics with varied periodicity, ensures lens performance at...

The leadless cardiac pacemaker is a pioneering device for heart patients. Its rising success requires the design of compact implantable antennas. In this paper, we describe circularly polarized Hilbert curve inspired loop antenna. proposed antenna works in WMTS (Wireless Medical Telemetry Services) 1.4 GHz and ISM (Industrial, Scientific, Medical) 2.45 bands. High dielectric constant material Rogers RT/Duroid 6010 LM ([Formula: see text]=10) fractal geometry helps to with small footprint 9.1...

In this paper, a novel low profile planar inverted-F antenna (PIFA) with high gain and specific absorption rate (SAR) using miniaturized artificial magnetic conductor (AMC) is investigated. The performance of the PIFA analyzed AMC to understand contribution AMC. enhancement achieved by applying below antenna. Furthermore, placement also reduces SAR improves front-to-back ratio (FBR). proposed when measured has an impedance bandwidth 4.8–6.7 GHz (33% center frequency at 5.75 GHz) which...

The fifth generation (5G) network communication systems operate in the millimeter waves and are expected to provide a much higher data rate multi-gigabit range, which is impossible achieve using current wireless services, including sub-6 GHz band. In this work, we briefly review several existing designs of millimeter-wave phased arrays for 5G applications, beginning with low-profile antenna array that either fixed beam or scan only one plane. We then move on offer two-dimensional (2D)...

In this work, we present a new systematic technique for the design of flat lens using modified commercial off-the-shelf (COTS) materials, as opposed to metamaterials (MTMs) that are often required in designs based on Transformation Optics (TO) approach.While Ray (RO) do not suffer from drawback having use metamaterials, they still require dielectric materials may be commercially available off-the-shelf.This paper describes procedure realizing desired by modifying COTS types, and illustrates...

Abstract Background COVID-19 is widely spreading across the globe right now. While some countries have flattened curve, others are struggling to control spread of infection. Precise risk prediction modeling key accurate prevention and containment infection, as well for preparation resources needed deal with pandemic in different regions. Methods Given vast differences approaches scenarios used by these models predict future infection rates, this study, we compared accuracy among such...

For 5G and WiMAX applications, a coplanar waveguide (CPW)-fed monopole antenna sandwiched between an artificial magnetic conductor (AMC) superstrate is investigated. Because traditional planar antennas have low gains, they are unsuitable for wide range of applications. This paper explores scientific strategies increasing radiation gain in low-gain such as monopoles. We use AMC conjunction with to achieve high antenna, the serving primary radiator. However, superstate like this demands...

Abstract Normally, the reported gain of microstrip patch antenna is within 8 dBi. Using properly located three shorting pins on bisectors, present work reports a method to convert non-radiating TM 11 mode equilateral triangular antennas (ETPAs) deformed radiating mode. The boresight ETPA operating in enhanced from −10.75 12.1 dBi at 5.43 GHz. measured further 14.2 5.52 GHz by using surface-mounted short horn (SMSH) about ${{\lambda }}/5$ height. aperture efficiency with 84.2%. improved 94.2%...

In this work, we present a new systematic technique for the design of flat lens using modified commercial off-the-shelf (COTS) materials, as opposed to metamaterials that are often required in designs based on Transformation Optics (TO) approach. While Ray (RO) do not suffer from above drawback having use metamaterials, they still require dielectric materials may be precisely available off-the-shelf. This paper describes procedure realizing desired by modifying COTS types, and illustrates...

This paper presents the statistical analysis of a 3D printed flat lens by using Polynomial Chaos Expansion (PCE) technique. The is fabricated printing technology and based on grading-index (GRIN) approach. It composed several concentric rings with graded relative permittivity, made single material different air holes-host volume ratio. We show that hole size can have significant effect performance lens, especially focal distance. PCE enables us also to determine impact each individual ring lens.

This article presents a new design of six-element prism and eight-element cubic circularly polarized multiple input output (MIMO) antennas exhibiting pattern polarization diversity characteristics. The proposed have 360° angular coverage. Each element the MIMO antenna is radiating power in different direction; antenna-1 radiates −30°, antenna-2 30°, antenna-3 60°, antenna-4 120°. Antenna-5 150°, antenna-6 −150°, antenna-7 −120°, antenna-8 −60°.The radiation can be directed specific direction...

In millimeter-wave (mmWave) communications, the antenna gain is a crucial parameter to overcome path loss and atmospheric attenuation. This work presents design of two cylindrical conformal arrays, made modified rectangular microstrip patch as radiating element, working at 28 GHz for mmWave applications providing high beam steering capability. The element uses Rogers RO4232 substrate with thickness 0.5 mm surface area 5.8 × mm. individual provides 6.9 dBi return bandwidth 5.12 GHz. first...

The quest to extract vital information regarding protein-coding genes has always fascinated scientific community. However, there is scarcity of experimental data on internal mechanism controlling the synthesis functional gene product. This due fact that process identification transcription site highly complex. In order understand transcription, it essential identify promoters since promoter sequences define where a begins. use Machine Learning provided substantially accurate results as...

This paper presents a modification of rectangular microstrip patch antenna (MPA) which improves the S <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> bandwidth from 6.6% to 17.5% at center frequency 28 GHz. The gain this has been improved by using dielectric superstate 6.81 dB 10.73 dB. Further, improvement and cross-polarization suppression are also achieved multi-strip selective surface (FSS) as superstrate.

In this work, we present low profile lens and reflectarray design for millimeter wave. We use artificially engineered dielectric materials (Dial-a-Dielectric) these designs. comparison results with legacy designs that show comparable or better performance. compare of a flat using commercial off-the-shelf (COTS) materials, as opposed to metamaterials are often required in based on the Transformation Optics (TO) approach. While Ray (RO) do not suffer from above drawback, they still require may...

In this work, we present a flat lens design using the Dial-a-Dielectric (DaD) approach to realize permittivities that are not available off-the-shelf. To show efficacy of design, comparison results with legacy design. We compare commercial off-the-shelf (COTS) materials combined 3-D fabrication material. contrast Transformation Optics approach, does employ metamaterials (MTMs) can be narrowband and lossy.