scholarly journals Ultra-Wideband Trapezoidal Log-Periodic Antenna Integrated with an Elliptical Lens

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2169
Author(s):  
Syifa Haunan Nashuha ◽  
Gwan Hui Lee ◽  
Sachin Kumar ◽  
Hyun Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Ultra Wideband ◽  
Design Parameters ◽  
Impedance Bandwidth ◽  
Antenna Gain ◽  
Transition Structure ◽  
Coplanar Stripline ◽  
Design And Implementation ◽  
Dielectric Lens ◽  
Log Periodic Antenna ◽  
Peak Gain

The design and implementation of an ultra-wideband trapezoidal log-periodic antenna (LPA) integrated with an elliptical dielectric lens are presented. The proposed LPA is fed by an ultra-wideband microstrip-to-coplanar stripline transition structure. In order to improve the radiation patterns and to increase the antenna gain, an elliptical dielectric lens is mounted on the top of the LPA radiator. The design parameters of the elliptical lens integrated with the LPA were optimized through a parametric analysis. The proposed antenna shows an impedance bandwidth (S11 ≤ −10 dB) from 5.2 to 40 GHz, with a peak gain of 17.8 dB.

scholarly journals Reconfigurable 2×1 CPW-Fed Rectangular Slot Antenna Array (RSAA) Based on Graphene for Wireless Communications

2021 ◽  
Vol 36 (6) ◽  
pp. 788-795
Author(s):  
Dalia Elsheakh ◽  
Osama Dardeer
Keyword(s):  
Wireless Communications ◽  
Antenna Array ◽  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Average Gain ◽  
Rectangular Slot ◽  
High Data ◽  
Peak Gain

This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λ×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearly polarized operation of the proposed array over the operating bands makes it suitable for short-range wireless communications .

scholarly journals Design Studies of Ultra-Wideband Microstrip Antennas with a Small Capacitive Feed

2007 ◽  
Vol 2007 ◽  
pp. 1-8 ◽  
Author(s):  
Veeresh G. Kasabegoudar ◽  
Dibyant S. Upadhyay ◽  
K. J. Vinoy
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Microstrip Antennas ◽  
Design Criterion ◽  
Air Gap ◽  
Ultra Wideband ◽  
Design Parameters ◽  
Impedance Bandwidth ◽  
Rectangular Patch ◽  
Almost All

The design of an ultra-wideband microstrip patch antenna with a small coplanar capacitive feed strip is presented. The proposed rectangular patch antenna provides an impedance bandwidth of nearly 50%, and has stable radiation patterns for almost all frequencies in the operational band. Results presented here show that such wide bandwidths are also possible for triangular and semiellipse geometries with a similar feed arrangement. The proposed feed is a very small strip placed very close to the radiator on a substrate above the ground plane. Shape of the feed strip can also be different, so long as the area is not changed. Experimental results agree with the simulated results. Effects of key design parameters such as the air gap between the substrate and the ground plane, the distance between radiator patch and feed strip, and the dimensions of the feed strip on the input characteristics of the antenna have been investigated and discussed. As demonstrated here, the proposed antenna can be redesigned for any frequency in the L-, S-, C-, or X-band. A design criterion for the air gap has been empirically obtained to enable maximum antenna bandwidth for all these operational frequencies.

scholarly journals Miniaturized Antipodal Vivaldi Antenna with Improved Bandwidth Using Exponential Strip Arms

Electronics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 83
Author(s):  
Mohammad Mahdi Honari ◽  
Mohammad Saeid Ghaffarian ◽  
Rashid Mirzavand
Keyword(s):  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Lower Edge ◽  
Radiation Characteristics ◽  
Antenna Structure ◽  
Antenna Miniaturization ◽  
Vivaldi Antenna ◽  
Vivaldi Antennas ◽  
Peak Gain

In this paper, a miniaturized ultra-wideband antipodal tapered slot antenna with exponential strip arms is presented. Two exponential arms with designed equations are optimized to reduce the lower edge cut-off frequency of the impedance bandwidth from 1480 MHz to 720 MHz, resulting in antenna miniaturization by 51%. This approach also improves antenna bandwidth without compromising the radiation characteristics. The dimension of the proposed antenna structure including the feeding line and transition is 158 × 125 × 1 mm3. The results show that a peak gain more than 1 dBi is achieved all over the impedance bandwidth (0.72–17 GHz), which is an improvement to what have been reported for antipodal tapered slot and Vivaldi antennas with similar size.

Design of Ultra-Wideband Tapered Slot Antenna by Using Binomial Transformer with Corrugation

Frequenz ◽  
2017 ◽  
Vol 71 (5-6) ◽  
Author(s):  
Yosita Chareonsiri ◽  
Wanwisa Thaiwirot ◽  
Prayoot Akkaraekthalin
Keyword(s):  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Antenna Gain ◽  
Radiation Characteristics ◽  
Step Procedure ◽  
Flat Gain ◽  
Uwb Applications ◽  
Good Agreement

AbstractIn this paper, the tapered slot antenna (TSA) with corrugation is proposed for UWB applications. The multi-section binomial transformer is used to design taper profile of the proposed TSA that does not involve using time consuming optimization. A step-by-step procedure for synthesis of the step impedance values related with step slot widths of taper profile is presented. The smooth taper can be achieved by fitting the smoothing curve to the entire step slot. The design of TSA based on this method yields results with a quite flat gain and wide impedance bandwidth covering UWB spectrum from 3.1 GHz to 10.6 GHz. To further improve the radiation characteristics, the corrugation is added on the both edges of the proposed TSA. The effects of different corrugation shapes on the improvement of antenna gain and front-to-back ratio (F-to-B ratio) are investigated. To demonstrate the validity of the design, the prototypes of TSA without and with corrugation are fabricated and measured. The results show good agreement between simulation and measurement.

EFFECT OF CPW EDGES CHAMFERING TO THE PERFORMANCE OF ULTRA WIDEBAND ANTENNA

2015 ◽  
Vol 77 (10) ◽  
Author(s):  
Raimi Dewan ◽  
Mohamad Kamal A Rahim ◽  
Mohamad Rijal Hamid ◽  
M.H. Mokhtar ◽  
M.F.M. Yusoff
Keyword(s):  
Coplanar Waveguide ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Reflection Coefficients ◽  
Antenna Gain ◽  
Fractional Bandwidth ◽  
Uwb Antenna ◽  
Antenna Performance ◽  
Feeding Technique

In this paper, an Ultra Wideband (UWB) antenna is presented. The antenna radiating patch is circular in shape with coplanar waveguide (CPW) feeding technique. The proposed chamfering to the outer edges of the ground plane successfully widens the -10 dB impedance bandwidth of the antenna to cover from 1.92 GHz up to 15.16 GHz (correspond to 155% fractional bandwidth). The antenna gain varies from 2 to 5 dB over the operating band. Parametrical studies have been conducted for four different conditions of the ground plane; without chamfering, chamfering on the inner edges, chamfering on the outer edges and both chamfering of inner and outer edges. The effects of distinguished chamfering conditions to antenna performance are analyzed.  The measured and simulated results for reflection coefficients and radiation patterns (2.45 GHz, 3.5 GHz and 5.8 GHz) are presented. The corresponding realized gains are 2.14 dB, 2.85 dB and 3.4 dB respectively. The measured results satisfactorily agreed with the simulated ones. The antenna is 8 - 37 % wider bandwidth than previous research.

scholarly journals Study the Effect of Using Low-Cost Dielectric Lenses with Printed Log-Periodic Dipole Antennas for Millimeter-Wave Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Osama M. Haraz ◽  
Abdel Razik Sebak ◽  
Saleh Alshebeili
Keyword(s):  
Millimeter Wave ◽  
Low Cost ◽  
Side Lobe ◽  
Dipole Antenna ◽  
Impedance Bandwidth ◽  
60 Ghz ◽  
V Band ◽  
Wave Radar ◽  
Dielectric Lens ◽  
Peak Gain

Design of V-band high-gain printed log periodic dipole array (PLPDA) antenna loaded with a low-cost spherical dielectric lens is introduced. The proposed antenna consists of microstrip-line-fed log-periodic dipole antenna designed to operate in the V-band with a peak gain of 12.64 dBi at 60 GHz. To enhance the antenna gain, a dielectric lens is installed. The antenna prototype is fabricated and then tested experimentally using Agilent E8364B PNA Network Analyzer. Experimental results agree well with the simulated ones. The simulated results show that the proposed antenna can work from 42 GHz up to 82 GHz with a fractional impedance bandwidth of 64.5% covering the whole V-band (50–75 GHz). At 60 GHz, the proposed antenna has peak gain of 26.79 dBi with a gain variation of 3.5 dBi across the whole V-band with stable radiation patterns over the operating band. The proposed PLPDA antenna achieves good side-lobe suppression, excellent front-to-back ratio in bothE- andH-planes, and low cross-polarization levels over the entire frequency range. These unique features will make this antenna suitable for different interesting applications such as millimeter-wave radar and imaging applications.

scholarly journals A design of lens antenna with high gain

2021 ◽  
Vol 336 ◽  
pp. 01005
Author(s):  
Darong Gao
Keyword(s):  
Wireless Communications ◽  
Microstrip Antenna ◽  
Return Loss ◽  
High Gain ◽  
Impedance Bandwidth ◽  
Lens Antenna ◽  
Communications Systems ◽  
Dielectric Lens ◽  
Wireless Communications Systems ◽  
Peak Gain

In this paper, A lens antenna with high gain is proposed. The antenna is composed of the microstrip antenna and the hemisphere dielectric lens, and the lens is loaded on the top. The polyethylene is used to fabricated the hemisphere dielectric lens. The antenna has dimensions of 47.58 mm × 47.58 mm × 24.79 mm, which is corresponding to the electrical size of 1.586λ0×1.586λ0×0.826λ0, where λ0 is the free-space wavelength at 10GHz. The impedance bandwidth (return loss<-10dB) is 12.7%(9.24 GHz-10.51 GHz), and the peak gain is 9.06 dBi. The hemisphere dielectric lens can improve the gain of the microstrip antenna. The proposed lens antenna is suitable for wireless communications systems.

scholarly journals Design of a miniaturized ultrawideband and low scattering antipodal vivaldi antenna array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jia Liu ◽  
Chengxiang Xu ◽  
Hang Yu ◽  
Jianxun Su
Keyword(s):  
Normal Incidence ◽  
High Gain ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Phase Cancellation ◽  
Dielectric Lens ◽  
Array Structure ◽  
Vivaldi Antenna ◽  
Good Agreement

AbstractThis paper presents a miniaturized ultra-wideband (UWB) antipodal Vivaldi antenna (AVA) array with low-scattering characteristics integrated a hybrid diffusive-absorptive metasurface. Periodic elliptical slots at the outer edges and a dielectric lens are utilized for antenna element to improve performances including miniaturized size, wide bandwidth, and high gain. The optimized element is fabricated and measured, the results demonstrate that the − 10 dB impedance bandwidth is 4.5–50 GHz with a ratio bandwidth (fH/fL) of 11.1:1, and the maximum gain at 35 GHz is 12.7 dBi, which are in good agreement with simulation. By loading an optimized Minkowski-shaped metasurface as the ground reflector, which combines the multielement phase cancellation (MEPC) and EM absorption technology, the 4 × 4 array realizes a low radar cross section (RCS) without the radiation performance degradation. Simulated and measured results show that the proposed low-scattering array has a 10-dB RCS reduction band ranging from 5 to 50 GHz at normal incidence for both polarizations. Furthermore, the array structure shows extremely low-observable capability, which is larger than 15 dB of the RCS reduction from 7.1 to 50 GHz with a ratio bandwidth of 7.0:1. The results verify the feasibility of improving the performance of antenna and the UWB low-scattering functionality.

Miniaturized CPW-fed UWB-MIMO antennas with decoupling stub and enhanced isolation

2021 ◽  
pp. 1-9
Author(s):  
Muhammad Irfan Khattak ◽  
Muhammad Irshad Khan ◽  
Muhammad Anab ◽  
Amjad Ullah ◽  
Muath Al-Hasan ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Diversity Gain ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
Multiple Input ◽  
Is Design ◽  
Peak Gain

Abstract In this paper, a coplanar waveguide-fed ultra-wideband-multiple-input and multiple-output (UWB-MIMO) antenna with a novel stub for isolation has been presented. The dimensions of the proposed antenna are 18 × 22 × 1.6 mm3. The proposed antenna is design on an FR4 substrate and simulated in CST studio. The |S11| of the presented MIMO antenna is less than −10 dB between 2.8 and 13 GHz with an impedance bandwidth of 10.2 GHz. The envelope correlation coefficient (ECC) is less than 0.007 and diversity gain (DG) is greater than 9.97 dB. The proposed UWB-MIMO antenna is analyzed in terms of isolation, reflection coefficient, current distribution, ECC, DG, peak gain, multiplexing efficiency, and radiation pattern.

A compact four-port UWB MIMO antenna with connected ground and wide axial ratio bandwidth

2019 ◽  
Vol 12 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Sachin Kumar ◽  
Gwan Hui Lee ◽  
Dong Hwi Kim ◽  
Wahab Mohyuddin ◽  
Hyun Chul Choi ◽  
...  
Keyword(s):  
Design Method ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Axial Ratio ◽  
Unit Cell ◽  
Ultra Wideband ◽  
Design Parameters ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Input Multiple Output

AbstractA new design method of an ultra-wideband circularly-polarized planar multiple-input-multiple-output (MIMO) antenna is presented in this paper. The proposed MIMO antenna consists of four unit cell antennas, being comprised of a microstrip feed line and a square slotted ground plane. In the proposed unit cell design, a circular stub is protruded from the ground plane strip for achieving circular polarization. The unit cell of the MIMO antenna is optimized by adjusting design parameters. The compact four-port MIMO antenna prototype is designed on the FR4 substrate with the overall dimensions of 45 × 45 × 1.6 mm3. The proposed four-port MIMO antenna design provides an impedance bandwidth (S11 < −10 dB) of 112% (3.1–11 GHz) and a 3 dB axial ratio bandwidth of 36% (4.8–6.9 GHz). The performance of the fabricated MIMO antenna shows good agreement between the EM simulation and measurement results.

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