scholarly journals High Efficient and Ultra Wide Band Monopole Antenna for Microwave Imaging and Communication Applications

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 115 ◽  
Author(s):  
Shahid Ullah ◽  
Cunjun Ruan ◽  
Muhammad Shahzad Sadiq ◽  
Tanveer Ul Haq ◽  
Wenlong He
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Phase Variation ◽  
Wide Band ◽  
Microwave Imaging ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Center Frequency ◽  
Wide Bandwidth ◽  
High Efficient

The paper presents a highly efficient, low cost, ultra-wideband, microstrip monopole antenna for microwave imaging and wireless communications applications. A new structure (z-shape, ultra-wideband (UWB) monopole) is designed, which consists of stepped meander lines to achieve super-wide bandwidth and high efficiency. Three steps are used to design the proposed structure for the purpose to achieve high efficiency and wide bandwidth. The antenna bandwidth is enhanced by varying the length of meander line slots, optimization of the feeding line and with the miniaturization of the ground width. The simulated and measured frequency bands are 2.7–22.5 GHz and 2.8–22.7 GHz (156% fractional bandwidth), respectively. The dimensions of the antenna are 38 mm × 35 mm × 1.57 mm, and its corresponding electrical size is 2.41 λg × 2.22 λg × 0.09 λg, where guided wavelength λg is at the center frequency (12.75 GHz). This antenna achieved a high bandwidth ratio (8.33:1). The realized gain is varying from 1.6–6.4 dBi, while that of efficiency is 70% to 93% for the whole band. Radiation patterns are measured at four operating frequencies. It has an acceptable group delay, fidelity factor, and phase variation results that satisfy the limit of ultra-wideband in the form of the time domain.

Ultra-Wideband High Gain Vivaldi Antennas Using Additive Manufacturing

2018 ◽  
Vol 2018 (1) ◽  
pp. 000754-000759
Author(s):  
Mohd Ifwat Mohd Ghazali ◽  
Premjeet Chahal
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Low Cost ◽  
Low Frequency ◽  
Wide Band ◽  
High Gain ◽  
Ultra Wideband ◽  
Wide Bandwidth ◽  
Frequency Matching ◽  
Vivaldi Antennas

Abstract In this paper, a low-cost fabrication technique using additive manufacturing (3D printing) is demonstrated for the fabrication of ultra-wide band (UWB) Vivaldi antennas. In communications, UWB antennas are required that have high gain and wide bandwidth (3.1 GHz to 10.6 GHz) enabling high-data rates and efficient use of frequency spectrum. 3D printing has evolved into an important technology that allows rapid and simple fabrication method for printing antennas, and other components. Two different Vivaldi antennas designs (i) Vivaldi with a slot line, and (ii) Corrugated Vivaldi are presented. The fabricated antennas have a wide bandwidth of 14 GHz and a high gain of 10 dBi. For example, the corrugated antenna exploits the capability of 3D printing to incorporate slots in the design that aids in low frequency matching with increased gain.

Ultra-wideband elliptical patch antenna for microwave imaging of wood

2019 ◽  
Vol 11 (9) ◽  
pp. 948-966 ◽  
Author(s):  
Tale Saeidi ◽  
Idris Ismail ◽  
Wong Peng Wen ◽  
Adam R. H. Alhawari
Keyword(s):  
Low Frequency ◽  
Wide Band ◽  
Microwave Imaging ◽  
Ultra Wideband ◽  
Uniform Illumination ◽  
Elliptical Shape ◽  
Measurement Results ◽  
Simulation Results ◽  
Strip Loading ◽  
Good Agreement

AbstractThis paper presents the design of an elliptical shape ultra-wide band antenna for imaging of wood. The antenna is constructed comprising an elliptical shape of patch loaded by a stub to resonate at lower bands, strip loading at the back, and chamfered ground. Despite having miniaturized dimensions of 20 mm × 20 mm, the proposed antenna shows better results compared to recent studies. The simulation results depict a good ultra-wide bandwidth from 2.68 to 16 GHz, and 18.2–20 GHz. Besides, the proposed antenna has two low-frequency bands at 0.89–0.92 and 1.52–1.62 GHz, maximum gain of 5.48 dB, and maximum directivity of 6.9 dBi. The measurement outcomes are performed in air, plywood, and high-density wood and show a good agreement with the simulated results done using electromagnetic simulator CST. In addition to that, the measurement results of S-parameters, transmitted and received signals show a good agreement with the simulated results. Besides, the measured results illustrate a good isolation and uniform illumination among arrays as well as the received signals' shapes do not change in different environments, but only the amplitude. Hence, the proposed antenna seems to be adequate for microwave imaging of wood.

scholarly journals The Possibility of a High-efficiency Wave Power Generation System using Dielectric Elastomers

2021 ◽  
Author(s):  
Kazuhiro Ohyama ◽  
Seiki Chiba ◽  
Mikio Waki ◽  
Changqing Jiang ◽  
Makoto Takeshita ◽  
...  
Keyword(s):  
Power Generation ◽  
Environmental Sustainability ◽  
High Efficiency ◽  
Low Cost ◽  
Artificial Muscle ◽  
Current Status ◽  
Oscillating Water Column ◽  
Generation System ◽  
High Efficient ◽  
Power Generation System

Abstract: Power generation using dielectric elastomer (DE) artificial muscle is attracting attention because of its light weight, low cost, and high efficiency. Since this method is a system that produces electricity without emitting carbon dioxide nor using rare earths, it would contribute to the goal of environmental sustainability. In this paper, the background of DEs, the associated high-efficient wave energy generation (WEG) systems that we developed using DEs, as well as the latest development of its material are summarized. By covering the challenges we face and the achievements that we’ve reached, we can discuss the opportunities to build the foundation of a recycled energy society through the usage of these WEGs. On the other hand, to make these possibilities commercially successful, the advantages of DEs need to be integrated with traditional technologies. To achieve this, we also consider the method of using DEs alone and a system used in combination with an oscillating water column. Finally, the current status and future of DEGs are discussed.

scholarly journals A Jug-Shaped CPW-Fed Ultra-Wideband Printed Monopole Antenna for Wireless Communications Networks

2022 ◽  
Vol 12 (2) ◽  
pp. 821
Author(s):  
Sarosh Ahmad ◽  
Umer Ijaz ◽  
Salman Naseer ◽  
Adnan Ghaffar ◽  
Muhammad Awais Qasim ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Low Cost ◽  
Coplanar Waveguide ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Uwb Antenna ◽  
Compact Size ◽  
Parametric Studies ◽  
Printed Monopole Antenna ◽  
Printed Monopole

A type of telecommunication technology called an ultra-wideband (UWB) is used to provide a typical solution for short-range wireless communication due to large bandwidth and low power consumption in transmission and reception. Printed monopole antennas are considered as a preferred platform for implementing this technology because of its alluring characteristics such as light weight, low cost, ease of fabrication, integration capability with other systems, etc. Therefore, a compact-sized ultra-wideband (UWB) printed monopole antenna with improved gain and efficiency is presented in this article. Computer simulation technology microwave studio (CSTMWS) software is used to build and analyze the proposed antenna design technique. This broadband printed monopole antenna contains a jug-shaped radiator fed by a coplanar waveguide (CPW) technique. The designed UWB antenna is fabricated on a low-cost FR-4 substrate with relative permittivity of 4.3, loss tangent of 0.025, and a standard height of 1.6 mm, sized at 25 mm × 22 mm × 1.6 mm, suitable for wireless communication system. The designed UWB antenna works with maximum gain (peak gain of 4.1 dB) across the whole UWB spectrum of 3–11 GHz. The results are simulated, measured, and debated in detail. Different parametric studies based on numerical simulations are involved to arrive at the optimal design through monitoring the effects of adding cuts on the performance of the proposed antennas. Therefore, these parametric studies are optimized to achieve maximum antenna bandwidth with relatively best gain. The proposed patch antenna shape is like a jug with a handle that offers greater bandwidth, good gain, higher efficiency, and compact size.

Super wideband printed monopole antenna for ultra wideband applications

2015 ◽  
Vol 9 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Sandeep Kumar Palaniswamy ◽  
Malathi Kanagasabai ◽  
Shrivastav Arun Kumar ◽  
M. Gulam Nabi Alsath ◽  
Sangeetha Velan ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Wide Band ◽  
Local Area ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Area Network ◽  
Compact Size

This paper presents the design, testing, and analysis of a clover structured monopole antenna for super wideband applications. The proposed antenna has a wide impedance bandwidth (−10 dB bandwidth) from 1.9 GHz to frequency over 30 GHz. The clover shaped antenna with a compact size of 50 mm × 45 mm is designed and fabricated on an FR4 substrate with a thickness of 1.6 mm. Parametric study has been performed by varying the parameters of the clover to obtain an optimum wide band characteristics. Furthermore, the prototype introduces a method of achieving super wide bandwidth by deploying fusion of elliptical patch geometries (clover shaped) with a semi elliptical ground plane, loaded with a V-cut at the ground. The proposed antenna has a 14 dB bandwidth from 5.9 to 13.1 GHz, which is suitable for ultra wideband (UWB) outdoor propagation. The prototype is experimentally validated for frequencies within and greater than UWB. Transfer function, impulse response, and group delay has been plotted in order to address the time domain characteristics of the proposed antenna with fidelity factor values. The possible applications cover wireless local area network, C-band, Ku-band, K-band operations, Worldwide Interoperability for Microwave Access, and Wireless USB.

Bird Face Microstrip Printed Monopole Antenna Design for Ultra Wide Band Applications

Frequenz ◽  
2016 ◽  
Vol 70 (11-12) ◽  
Author(s):  
Mohammad Jakir Hossain ◽  
Mohammad Rashed Iqbal Faruque ◽  
Md. Moinul Islam ◽  
Mohammad Tariqul Islam ◽  
Md. Atiqur Rahman
Keyword(s):  
Ground Plane ◽  
Wide Band ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Uwb Antenna ◽  
Compact Antenna ◽  
Printed Monopole Antenna ◽  
Printed Monopole ◽  
Microstrip Feed

AbstractIn this paper, a novel bird face microstrip printed monopole ultra-wideband (UWB) antenna is investigated. The proposed compact antenna consists of a ring-shaped with additional slot and slotted ground plane on FR4 material. The overall electrical dimension of the proposed antenna is 0.25 λ×0.36 λ×0.016 λ and is energized by microstrip feed line. The Computer Simulation Technology (CST) and the High Frequency Structural Simulator (HFSS) is applied in this analysis. The impedance bandwidth of the monopole antenna cover 3.1–12.3 GHz (9.2 GHz, BW) frequency range. The messurement displayed that the designed antenna achieved excellent gain and stable omnidirectional radiation patterns within the UWB. The maximum gain of 6.8 dBi and omnidirectional radiation pattern makes the proposed antenna that is suitable for UWB systems.

scholarly journals Single-Layer Circularly Polarized Wide Band Reflectarray Antenna with High Aperture Efficiency

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Xinyu Da ◽  
Jialiang Wu ◽  
Jing Zhao ◽  
Lin Baoqin ◽  
Kai Wu
Keyword(s):  
Phase Response Curve ◽  
Low Cost ◽  
Single Layer ◽  
Wide Band ◽  
Center Frequency ◽  
Angular Rotation ◽  
Circularly Polarized ◽  
Aperture Efficiency ◽  
Rotation Technique ◽  
Good Agreement

A circularly polarized broadband low-cost reflectarray in Ku-band is presented using a novel single-layer subwavelength phase-shifting element. The proposed subwavelength element consists of the concentric split ring and the crossed bowtie. The linear reflected phase response curve with 360° phase coverage is obtained. For experimental verification, an array of 25 × 25 reflectarray prototype has been designed and manufactured by employing the angular rotation technique. The measurements are in good agreement with the simulations. The measured gain at the center frequency of 12.5 GHz is 26.6 dBi, corresponding to the aperture efficiency of 52.5%, and the 1 dB gain bandwidth is 26.4%.

scholarly journals A Low Cost and Portable Microwave Imaging System for Breast Tumor Detection Using UWB Directional Antenna array

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
M. T. Islam ◽  
M. Z. Mahmud ◽  
M. Tarikul Islam ◽  
S. Kibria ◽  
M. Samsuzzaman
Keyword(s):  
Dielectric Properties ◽  
Breast Tumor ◽  
Breast Imaging ◽  
Imaging System ◽  
Low Cost ◽  
Microwave Imaging ◽  
Dielectric Constants ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Breast Phantom

Abstract Globally, breast cancer is a major reason for female mortality. Due to the limitations of current clinical imaging, the researchers are encouraged to explore alternative and complementary tools to available techniques to detect the breast tumor in an earlier stage. This article outlines a new, portable, and low-cost microwave imaging (MWI) system using an iterative enhancing technique for breast imaging. A compact side slotted tapered slot antenna is designed for microwave imaging. The radiating fins of tapered slot antenna are modified by etching nine rectangular side slots. The irregular slots on the radiating fins enhance the electrical length as well as produce strong directive radiation due to the suppression of induced surface currents that radiate vertically at the outer edges of the radiating arms with end-fire direction. It has remarkable effects on efficiency and gain. With the addition of slots, the side-lobe levels are reduced, the gain of the main-lobe is increased and corrects the squint effects simultaneously, thus improving the characteristics of the radiation. For experimental validation, a heterogeneous breast phantom was developed that contains dielectric properties identical to real breast tissues with the inclusion of tumors. An alternative PC controlled and microcontroller-based mechanical MWI system is designed and developed to collect the antenna scattering signal. The radiated backscattered signals from the targeted area of the human body are analyzed to reveal the changes in dielectric properties in tissues. The dielectric constants of tumorous cells are higher than that of normal tissues due to their higher water content. The remarkable deviation of the scattered field is processed by using newly proposed Iteratively Corrected Delay and Sum (IC-DAS) algorithm and the reconstruction of the image of the phantom interior is done. The developed UWB (Ultra-Wideband) antenna based MWI has been able to perform the detection of tumorous cells in breast phantom that can pave the way to saving lives.

scholarly journals Ultra-Wideband Low-Cost High-Efficiency Cavity-Backed Compound Spiral Antenna

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1399
Author(s):  
Charl Baard ◽  
Yulang Liu ◽  
Natalia Nikolova
Keyword(s):  
Time Domain ◽  
High Efficiency ◽  
Low Cost ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Competitive Performance ◽  
Spiral Antenna ◽  
Archimedean Spiral ◽  
Backward Radiation ◽  
Equiangular Spiral

A low-cost high-efficiency ultra-wideband (UWB) cavity-backed spiral antenna is proposed. It employs an equiangular spiral enclosed by an Archimedean spiral and it is fed through a tapered microstrip balun. A center-raised cylindrical absorber-free cavity backs the spiral to minimize the backward radiation without decreasing the efficiency. The cavity is designed to ensure an impedance bandwidth exceeding 16:1 ratio (from 350 MHz to 5.5 GHz). Simulated and measured results are presented and compared, demonstrating competitive performance in terms of impedance bandwidth and efficiency. Time–domain measurements indicate fidelity of 0.62 at boresight.

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