scholarly journals Grating-based Dipole Antenna Configuration for High Gain Directional Radiation characteristics

2017 ◽  
Vol 6 (1) ◽  
pp. 36
Author(s):  
V. P. Sarin ◽  
M. P. Jayakrishnan ◽  
C. K. Aanandan ◽  
P. Mohanan ◽  
K. Vasudevan
Keyword(s):  
Performance Enhancement ◽  
Impedance Matching ◽  
High Gain ◽  
Dipole Antenna ◽  
Metal Strip ◽  
Simulation Studies ◽  
Radiation Characteristics ◽  
Directional Radiation ◽  
Matching Performance ◽  
Magnetic Resonances

The experimental and simulation studies of the radiation performance enhancement of a dipole antenna using metal strip grating are presented in this paper. The subwavelength imaging configuration of the metal strip grating is utilized for enhancing the radiation performance of a dipole antenna working in the S-band. The resultant design shows a gain of 9 dBi and front to back ratio of the design is found to be -23 dB at resonance. The coupling between electric and magnetic resonances provides the necessary impedance matching performance when the antenna is brought in the vicinity of the grating.

A metamaterial absorber based high gain directional dipole antenna

2018 ◽  
Vol 10 (4) ◽  
pp. 430-436 ◽  
Author(s):  
Sarin Valiyaveettil Pushpakaran ◽  
Jayakrishnan M. Purushothama ◽  
Manoj Mani ◽  
Aanandan Chandroth ◽  
Mohanan Pezholil ◽  
...  
Keyword(s):  
Near Field ◽  
High Gain ◽  
Metamaterial Absorber ◽  
Dipole Antenna ◽  
Spatial Spectrum ◽  
Microwave Antenna ◽  
Radiation Characteristics ◽  
Directional Radiation ◽  
Half Wave ◽  
Absorption Mode

AbstractA novel idea for generating directional electromagnetic beam using a metamaterial absorber for enhancing radiation from a microwave antenna in the S-band is presented herewith. The metamaterial structure constitutes the well-known stacked dogbone doublet working in the absorption mode. The reflection property of the dogbone metamaterial absorber, for the non-propagating reactive near-field, is utilized for achieving highly enhanced and directional radiation characteristics. The metamaterial absorber converts the high-spatial reactive spectrum in the near-field into propagating low-spatial spectrum resulting in enhanced radiation efficiency and gain. The gain of a printed standard half-wave dipole is enhanced to 10 dBi from 2.3 dBi with highly directional radiation characteristics at resonance.

scholarly journals Chiral Dielectric Metasurfaces for Highly Integrated, Broadband Circularly Polarized Antenna

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2071
Author(s):  
Bruno Ferreira-Gomes ◽  
Osvaldo N. Oliveira ◽  
Jorge Ricardo Mejía-Salazar
Keyword(s):  
Impedance Matching ◽  
Axial Ratio ◽  
Satellite Communications ◽  
High Gain ◽  
Circularly Polarized ◽  
Low Profile ◽  
Millimeter Wave Antenna ◽  
And Performance ◽  
Magnetic Resonances ◽  
Magnetic Pairing

We report on the design of a low-profile integrated millimeter-wave antenna for efficient and broadband circularly polarized electromagnetic radiation. The designed antenna comprises a chiral dielectric metasurface built with a 2×2 arrangement of dielectric cylinders with slanted-slots at the center. A broadbeam high-gain with wide axial ratio (AR)<3 dB bandwidth was reached by pairing the electric and magnetic resonances of the dielectric cylinders and the slanted slots when excited by an elliptically polarized driven-patch antenna. This electric-magnetic pairing can be tuned by varying the cylinders diameter and the tilting and rotation angles of the slanted slots. The simulation results indicate impedance-matching bandwidths up to 22.6% (25.3–31.6 GHz) with 3-dB AR bandwidths of 11.6% (26.9–30.2 GHz), which in terms of compactness (0.95λ0×0.95λ0) and performance are superior to previous antenna designs. Since the simulations were performed by assuming materials and geometries easily implementable experimentally, it is hoped that circularly polarized antennas based on chiral metasurfaces can be integrated into 5G and satellite communications.

Vivaldi antennas: a historical review and current state of art

2020 ◽  
pp. 1-18
Author(s):  
Anindita Bhattacharjee ◽  
Abhirup Bhawal ◽  
Anirban Karmakar ◽  
Anuradha Saha ◽  
Diptendu Bhattacharya
Keyword(s):  
Performance Enhancement ◽  
Historical Review ◽  
Dielectric Substrate ◽  
High Gain ◽  
Substrate Selection ◽  
Radiation Characteristics ◽  
High Data ◽  
Dielectric Lens ◽  
Vivaldi Antenna ◽  
Vivaldi Antennas

Abstract The progressions in the field of wireless technology can be highly attributed to the development of antennas, which can access high data rates, provide significant gain and uniform radiation characteristics. One such antenna called the Vivaldi antenna has attracted the utmost attention of the researchers owing to its high gain, wide bandwidth, low cross-polarization, and stable radiation characteristics. Over the years, different procedures have been proposed by several researchers to improve the performance of the Vivaldi antennas. Some of these different approaches are feeding mechanisms, integration of slots, dielectric substrate selection, and radiator shape. Correspondingly, the performance of a Vivaldi antenna can be increased by including dielectric lens, parasitic patch in between two radiators, corrugations, as well as metamaterials. This paper gives a systematic identification, location, and analysis of a large number of performance enhancement methods of Vivaldi antenna design depicting their concepts, advantages, drawbacks, and applications. The principal emphasis of this article is to offer an outline of the developments in the design of Vivaldi antennas over the last few years, where the most important offerings, mostly from IEEE publications, have been emphasized. This review work aims to reveal a promising path to antenna researchers for its advancement using Vivaldi antennas.

scholarly journals Implementation of Compact Ultra wide Band Antenna Design for Breast Cancer Tumor detection

2019 ◽  
Vol 8 (4) ◽  
pp. 4701-4709
Keyword(s):  
Breast Cancer ◽  
Impedance Matching ◽  
Wide Band ◽  
High Gain ◽  
Ultra Wide Band ◽  
Uwb Antenna ◽  
Directional Radiation ◽  
Ansoft Hfss ◽  
Cancer Tumor ◽  
Accurate Position

One of the applications of UWB antenna is for detecting a cancer tumor according to breast cancer model system. The absolute dimensions of antenna are 44x30mm2 having a thickness of 1.6 mm. It involves Ultra wide band of 80% frequency range of 3 GHz–12 GHz for the FCC band. The proposed antenna resulted high gain and omni-directional radiation patterns and a considerable impedance matching. The optimized functioning of the antenna is illustrated by the simulation results. This antenna has been implemented in a designed system model with dielectric properties of a human breast capable to detect peculiar bodies. The tumor is detected and examined by the received Proportions and Positional coordinates, accessed by the application of UWB antenna. The accurate position coordinates of the tumor inside the breast are obtained at the places with the least Specific absorption rate (SAR). The antenna was used to localize the tumor precisely which shows the excellent functioning of the antenna and device. The proposed device is simulated by using Ansoft HFSS software and also CST Microwave studio simulator developed the breast model.

scholarly journals Performance Improvement of Substrate Integrated Cavity Fed Dipole Array Antenna Using ENZ Metamaterial for 5G Applications

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 125
Author(s):  
Shaza El-Nady ◽  
Rania R. Elsharkawy ◽  
Asmaa I. Afifi ◽  
Anwer S. Abd El-Hameed
Keyword(s):  
Coplanar Waveguide ◽  
Impedance Matching ◽  
High Gain ◽  
Dipole Antenna ◽  
Center Frequency ◽  
Antenna Element ◽  
Gain Enhancement ◽  
Radiated Power ◽  
Low Profile ◽  
Unit Cells

This paper exhibits a high-gain, low-profile dipole antenna array (DAA) for 5G applications. The dipole element has a semi-triangular shape to realize a simple input impedance regime. To reduce the overall antenna size, a substrate integrated cavity (SIC) is adopted as a power splitter feeding network. The transition between the SIC and the antenna element is achieved by a grounded coplanar waveguide (GCPW) to increase the degree of freedom of impedance matching. Epsilon-near-zero (ENZ) metamaterial technique is exploited for gain enhancement. The ENZ metamaterial unit cells of meander shape are placed in front of each dipole perpendicularly to guide the radiated power into the broadside direction. The prospective antenna has an overall size of 2.58 λg3 and operates from 28.5 GHz up to 30.5 GHz. The gain is improved by 5 dB compared to that of the antenna without ENZ unit cells, reaching 11 dBi at the center frequency of 29.5 GHz. Measured and simulated results show a reasonable agreement.

Investigation of e-textile dipole antenna performance based on embroidery parameters

2021 ◽  
pp. 004051752110134
Author(s):  
Daniel Agu ◽  
Rachel J Eike ◽  
Allyson Cliett ◽  
Dawn Michaelson ◽  
Rinn Cloud ◽  
...  
Keyword(s):  
Frequency Band ◽  
Impedance Matching ◽  
Dipole Antenna ◽  
Water Soluble ◽  
Wearable Sensor ◽  
Dipole Antennas ◽  
Antenna Performance ◽  
Large Production ◽  
Lower Transmission ◽  
The Ideal

E-textile antennas have the potential to be the premier on-body wearable sensor. Embroidery techniques, which can be applied to produce e-textile antennas, assist in large production volumes and fast production speeds. This paper focuses on the effects of three commonly used embroidery parameters, namely stitch type, conductive thread location, and stabilizer, on the performance of embroidered dipole antennas in order to determine the ideal embroidery combination for optimal antenna performance. Fifty-four dipole antenna samples were fabricated and measured at the industrial, scientific, and medical (ISM) frequency band of 2.45 GHz. The results of this study show that machine-embroidered antenna designs with satin stitches resonate at a lower frequency and exhibit a lower transmission gain compared with those made with contour stiches, and the conductive thread location in the bobbin location plus the use of a water-soluble stabilizer can help improve impedance matching.

Sign in / Sign up

Export Citation Format

Share Document