Design and Analysis of Ultra-wideband and High Directive THz Photoconductive Vivaldi Antenna

2020 ◽  
Vol 35 (10) ◽  
pp. 1242-1254
Author(s):  
Jawad Yousaf ◽  
Amira Dhiflaoui ◽  
Ali Yahyaoui ◽  
Bandar Hakim ◽  
Mohamed Zarouan ◽  
...  
Keyword(s):  
Quartz Substrate ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Design Parameters ◽  
Photoconductive Antenna ◽  
Frequency Range ◽  
Vivaldi Antenna ◽  
Silicon Based ◽  
First Time ◽  
Novel Design

In this work a novel design of an ultra-wideband and highly directive Vivaldi photoconductive antenna (PCA) is reported for the first time for the THz sensing and imaging applications. The optical-to-THz conversion efficiency for the enhanced directivity of the reported PCA is enhanced by adding a hemispherical silicon-based lens with the PCA gold electrode and quartz substrate (Epsilon r = 3.78, tan delta = 0.0001). The optimization of the antenna design parameters is performed in CST MWS for the frequency range of 1-6 THz. The design antenna has UWB -10 dB impedance and 3-dB AR bandwidths of 6 THz, maximum directivity of 10 dBi and maximum total radiation efficiency of > 40%.

Design and development of patch compensated wideband Vivaldi antenna

2018 ◽  
Vol 10 (9) ◽  
pp. 1081-1087
Author(s):  
Rana Pratap Yadav ◽  
Vinay Kumar ◽  
Rajveer Dhawan
Keyword(s):  
Computer Aided Design ◽  
Beam Width ◽  
Antenna Design ◽  
Planar Antenna ◽  
Optimized Design ◽  
Frequency Range ◽  
Feed Line ◽  
Vivaldi Antenna ◽  
Aided Design ◽  
Theoretical Procedure

AbstractDesign and fabrication of a microstrip feedline-based Vivaldi antenna in the frequency range of 6.0–8.0 GHz have been presented. The Vivaldi antenna is a planar antenna, fabricated at the microstrip feedline by having an exponentially tapered slot profile on it. An optimized computer-aided design has been developed and simulated for the desired radiation parameters like voltage standing wave ratio, bandwidth, directionality, beam-width, etc. The optimized design has been fabricated and tested. Wherever the results are not found as desired; problem has been comprehensively investigated and analyzed. This is found associated with a discontinuity at feed line, fabrication tolerance constraints and parasitic capacitance at the edges or the bent of the microstrip feedline which introduce the parasitic reactance in antenna design. Here, the presented work explores a generalized theoretical procedure for the compensation of associated problem by incorporating the reactive patch on the feedline. The developed theory is applied in fabrication and tested for the desired results.

scholarly journals DEVELOPMENT AND OPTIMIZATION OF AN ULTRA WIDEBAND MINIATURE MEDICAL ANTENNA FOR RADIOMETRIC MULTI-CHANNEL MULTI-FREQUENCY THERMAL MONITORING

2020 ◽  
pp. 71-81
Author(s):  
Mikhail Sedankin ◽  
Vitaly Leushin ◽  
Alexander Gudkov ◽  
Igor Sidorov ◽  
Sergey Chizhikov ◽  
...  
Keyword(s):  
Radiation Power ◽  
Fdtd Method ◽  
Depth Resolution ◽  
Wide Band ◽  
Biological Tissues ◽  
Dielectric Substrate ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Design Parameters ◽  
Calculated Mass

The article is devoted to the development of a printed ultra-wideband miniature antenna that can be used for microwave radiometry. An antenna design with a ring-shaped radiator has been proposed, which provides reception of microwave radiation from biological tissues in the 1800–4600 MHz range. The results of mathematical modeling of the antenna electromagnetic field in biological tissues using the finite difference time domain (FDTD) method are presented. Optimization of the antenna design has been carried out to ensure acceptable matching parameters and optimal antenna functionality. The developed antenna has a height of 6 mm and a calculated mass of 5 g; it is planned to manufacture a dielectric substrate based on PDMS polymer with the addition of barium titanate. The issues of calculating the antenna parameters (measurement depth, resolution and distribution of radiation power over the volume of biological tissue, sensitivity, etc.) are considered. The research results and design parameters of the developed antenna demonstrated the effectiveness of the new antenna and the possibility of its adaptation to the object of research. Considering the presence of an ultra-wide band and miniature dimensions, the antenna can be a sensor of a multi-frequency multi-channel microwave radiothermograph

scholarly journals Evolutionary Computing based Neuron-Computational Model for Microstrip Patch Antenna Design Optimization

2021 ◽  
Vol 13 (03) ◽  
pp. 15-40
Author(s):  
Rohini Saxena ◽  
Mukesh Kumar ◽  
Shadman Aslam
Keyword(s):  
Genetic Algorithm ◽  
Patch Antenna ◽  
Evolutionary Computing ◽  
Microstrip Patch Antenna ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Design Parameters ◽  
Adaptive Genetic Algorithm ◽  
Microstrip Patch ◽  
Depth Analysis

In this paper, a novel Evolutionary Computing named Adaptive Genetic Algorithm (AGA) based ANN model is developed for rectangular MPA (Microstrip patch antenna). Considering at-hand and Nextgeneration Ultra wideband application demands, the emphasis has been made on retaining optimal lowcost design with desired cut-off frequency. The proposed method employs multiple sets of theoreticallydriven training instances or patch antenna design parameters which have been processed for normalization and sub-sampling to achieve a justifiable and reliable sample size for further design parameter prediction. Procedurally, the input design parameters were processed for normalization followed by sub-sampling to give rise to a sufficient set of inputs to perform knowledge-driven (designparameter) prediction. Considering limitations of the major at-hand machine learning methods which often undergo local minima and convergence while training, we designed a state-of-art new Adaptive Genetic Algorithm based neuro-computing model (AGA-ANN), which helped to predict the set of optimal design parameters for rectangular microstrip patch antenna. The predicted patch antenna length and width values were later used for verification which achieved the expected frequency. The depth analysis revealed that a rectangular patch antenna with width 14.78 mm, length 11.08mm, feed-line 50 Ω can achieve the cut-off frequency of 8.273 GHz, which can be of great significance for numerous UWB applications.

scholarly journals Design an Ultra- Wideband Modified Wilkinson Power Divider Fed-by Balanced Antipodal Vivaldi Antenna Array for Imaging Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 4236-4241
Keyword(s):  
Low Cost ◽  
Impedance Matching ◽  
Simulation Software ◽  
Ultra Wideband ◽  
Power Divider ◽  
Power Splitting ◽  
Frequency Range ◽  
Radial Stub ◽  
Vivaldi Antenna ◽  
Wilkinson Power Divider

In this paper, design of compactand modified geometrical structure of 1-to-4 way ultra-wideband Wilkinson power divider used as a feeding network for 4-element of balanced antipodal Vivaldi antenna (BAVA) array has introduced. The proposed Wilkinson power divider has been designed and printed on low-cost Epoxy laminate substrate FR4 along with the thickness of 1.6mm and relative permittivity of ɛr =4.3 respectively. The transformation of power divider network which are based on bent corners as a replacement of sharp corners or edges used for the decrement in unintended radiation and employing a single radial stub on each branch to encounter the antenna-specifications. Further some adjustments in the dimension of stubs matching in order to increase the reflection of the power divider network. The design presents the model of a power divider and maintains an equal power splitting at different ports with practical insertion loss and conventional return loss below -10dB. The reasonable impedance matching has achieved at every single port with acceptable isolation performance values over the (3-to-10 GHz) frequency range. The divider as well as antenna elements design and its optimization are practicable via computer simulation technology (CST) simulation software. The experimental results are revealed to encounter the arrayspecifications under ultra-wideband frequency range..

scholarly journals Band-Notched Antipodal Vivaldi Antenna using Edge-Located Vias Mushroom EBG Structure for Ultra Wideband Applications

2020 ◽  
Vol 9 (4) ◽  
pp. 2455-2459
Keyword(s):  
Dielectric Material ◽  
Low Cost ◽  
Surface Current ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Ieee 802.11A ◽  
Notch Band ◽  
Directional Radiation ◽  
Field Radiation ◽  
Vivaldi Antenna

An Ultra wideband (UWB) Antipodal Vivaldi Antenna operating at 2.78 GHz to more than 12 GHz with dual notch band attributes is designed for application in ultra-wideband. The proposed double-layered antenna is designed on a low cost FR-4 dielectric material with combined thickness of 2.1mm. Two edge-located vias mushroom type EBG metamaterial structures were incorporated within a conventional antipodal Vivaldi antenna (AVA) in between the two substrate layers and below the feeding line, to realize the proposed antenna. Using the band gap property of the EBG structure, two notch bands were created within the ultra wideband frequency range of the antenna for WiMAX IEEE 802.16 application at 3.18 – 3.80 GHz and WLAN IEEE 802.11a application at 5.13 – 5.80 GHz. Simulation results showed a almost stable directional radiation pattern in the entire frequency range except in the two notch bands, having a peak realize gain of 7.69 dBi at 6.5 GHz. Additionally, surface current distribution and far-field radiation patterns are also studied to characterize the achievement of the presented antenna.

Design and Performance Simulation of Two Kinds of Antipodal Vivaldi Antennas for Wide Band Radar Systems

2012 ◽  
Vol 170-173 ◽  
pp. 2893-2898
Author(s):  
Li Zhong Song ◽  
Huan Feng Hong ◽  
Jing Hong Xue
Keyword(s):  
Wide Band ◽  
Operating Frequency ◽  
Design Parameters ◽  
Electronic Systems ◽  
Strip Line ◽  
Frequency Range ◽  
Operating Frequency Range ◽  
Vivaldi Antenna ◽  
And Performance ◽  
Vivaldi Antennas

The Vivaldi antennas are widely used in many wide band electronic systems for its good performances. This paper designed and simulated two kinds of Vivaldi antennas for wide band passive radar applications, which are the antipodal Vivaldi antenna fed by strip line and antipodal Vivaldi antenna fed by microstrip line. The specific design parameters and the radiation performances of each kind of vivaldi antenna are provided over the operating frequency range of 3GHz to 11GHz. Furthermore a circular antenna array with six Vivaldi antenna elements fed by microstrip lines was also simulated to obtain its radiation performances over the operating frequency range of 3GHz to 8GHz. The simulation results demonstrate the designed Vivaldi antennas have acceptable performances of voltage standing wave ratio (VSWR), patterns and gains, so they can be used in practical wide band radars.

scholarly journals UWB Single Port Log Periodic Toothed Terahertz Antenna Design Based on Graphene Artificial Magnetic Conductor

2017 ◽  
Vol 11 (3) ◽  
pp. 86 ◽  
Author(s):  
Hussein A. Abdulnabi ◽  
Refat T. Hussein ◽  
Raad S. Fyath
Keyword(s):  
Chemical Potential ◽  
Single Port ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Frequency Range ◽  
Magnetic Conductor ◽  
Dc Voltage ◽  
Artificial Magnetic Conductor ◽  
Log Periodic Antenna

In this work, a single port exponential tapered toothed log periodic antenna based on graphene artificial magnetic conductor (AMC) is suggested for ultra-wideband (1–10) THz operation. The resonance frequency of the proposed antenna can be tuned by changing the connected DC voltage which leads to variation in the chemical potential of the graphene.The radiating toothed log periodic antenna consists of gold patch placed on 25x25 graphene patches which act as an AMC surface unit. Exponential taper is used to satisfy impedance matching between the antenna and the feeder over the frequency range. The simulation results reveal that 90% of frequency range satisfies when the chemical potential is1eV.

scholarly journals Design of planar plate monopole antenna with vertical rectangular cross-sectional plates for ultra-wideband communications

2018 ◽  
Vol 31 (4) ◽  
pp. 641-650 ◽  
Author(s):  
Seyed Naghdehforushha ◽  
Mahdi Bahaghighat ◽  
Mohammad Salehifar ◽  
Hossein Kazemi
Keyword(s):  
Cross Sections ◽  
Return Loss ◽  
Wide Band ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Cross Sectional ◽  
Monopole Antennas ◽  
Wideband Communications ◽  
Novel Design

In this paper, a novel design for planar plate monopole antennas is proposed with applications to ultra-wide band (UWB) communications. To verify the proposed antenna design, simulations are performed by means of CST and HFSS software tools, showing that the impedance bandwidth is significantly increased by vertical cross-sections. By adding a series of parameters to the vertical cross sections, the antenna efficiency is effectively enhanced by achieving a return loss of 10 dB over the bandwidth range between 3.1 GHz and 10.6 GHz. In addition, our experimental results demonstrate that the fabricated antenna has a return loss performance similar to that obtained by the simulation results.

scholarly journals Design of a wideband strip helical antenna for 5G applications

2020 ◽  
Vol 9 (5) ◽  
pp. 1958-1963
Author(s):  
Mohammed Yousif Zeain ◽  
M. Abu ◽  
Z. Zakaria ◽  
Ahmed Jamal Abdullah Al-Gburi ◽  
R. Syahputri ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Resonant Frequency ◽  
Circular Polarization ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Design Parameters ◽  
Helical Antenna ◽  
Wireless Applications ◽  
Potential Applications

This paper presents the design of wideband strip helical antenna for 5G Application. The strip helical antenna is designed for 5G and wideband applications that provide a wide bandwidth and circular polarization. The helical antenna is planned on at 5.8 GHz frequency by using Teflon material. The new designed strip is printed on a substrate then rolled into a helix shape to achieve circular polarization without an impedance matching and that the proposed antenna can be used for potential applications in wideband wireless communication. A wideband bandwidth of 2.41 GHz with a resonant frequency at 5.8 GHz is achieved by the helical antenna on the Teflon substrate. The presented antenna on Teflon substrate has achieved a gain of 11.2 dB. The antenna design parameters and the simulated results are achieved using the commercial software CST. The proposed antenna can be used for various wireless applications such as Wideband, Ultra wideband, 5G and wireless Applications.

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