scholarly journals Design Formulas for Broadband Concentric Circular-Loops Antennas

2015 ◽  
Vol 4 (1) ◽  
pp. 45 ◽  
Author(s):  
S. M. Ali Hamed ◽  
A. A. Osman
Keyword(s):  
Resonance Frequency ◽  
Standing Wave ◽  
Excellent Agreement ◽  
Frequency Band ◽  
Ground Plane ◽  
Simulation Software ◽  
Voltage Standing Wave Ratio ◽  
Fractional Bandwidth ◽  
Maximum Radius ◽  
Simulation Results

This paper presents a simple formulas for designing broadband concentric circular-loops antennas (CCLAs). The loop dimensions for widest bandwidth are expressented in terms of the resonance frequency of the driven loop. The analysis addresses both cases CCLAs with and without ground planes. The presented formulas are employed to design multiple CCLAs.  For example, a 3-elements CCLA of a maximum radius of 6.34 cm can be designed to operate with a voltage standing wave ratio (VSWR) < 2 over a frequencies band of a fractional bandwidth of 16.9% with a minimum directivity of 3.9 dB. Addionationally, a 4-elements CCLA of maximum radius of 15 cm can be design to operate in the frequency band extending from 825 MHz to 991 MHz (fractional bandwidth of 18.3%) with a VSWR < 2 and directivity higher than 5.2 dB over the entire band. Furthermore, the analysis shows that a 3-elements CCLA backed with a conducting ground plane improves the fractional bandwidth to 19.6% and directivity to 9.15 dB over the band of interest. The analytical results on designed antennas are validated with simulation results obtained by using the AN-SOF antenna simulation software. An excellent agreement is observed between analytical and AN-SOF simulations results.

scholarly journals Design and Development of a Wideband Planar Yagi Antenna Using Tightly Coupled Directive Element

Micromachines ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 975
Author(s):  
Muhammad A. Ashraf ◽  
Khalid Jamil ◽  
Ahmed Telba ◽  
Mohammed A. Alzabidi ◽  
Abdel Razik Sebak
Keyword(s):  
Reflection Coefficient ◽  
Wireless Communication ◽  
Radiation Pattern ◽  
Excellent Agreement ◽  
Frequency Range ◽  
Fractional Bandwidth ◽  
Yagi Antenna ◽  
Tightly Coupled ◽  
Simulation Results ◽  
Novel Concept

In this paper, a novel concept on the design of a broadband printed Yagi antenna for S-band wireless communication applications is presented. The proposed antenna exhibits a wide bandwidth (more than 48% fractional bandwidth) operating in the frequency range 2.6 GHz–4.3 GHz. This is achieved by employing an elliptically shaped coupled-directive element, which is wider compared with other elements. Compared with the conventional printed Yagi design, the tightly coupled directive element is placed very close (0.019λ to 0.0299λ) to the microstrip-fed dipole arms. The gain performance is enhanced by placing four additional elliptically shaped directive elements towards the electromagnetic field’s direction of propagation. The overall size of the proposed antenna is 60 mm × 140 mm × 1.6 mm. The proposed antenna is fabricated and its characteristics, such as reflection coefficient, radiation pattern, and gain, are compared with simulation results. Excellent agreement between measured and simulation results is observed.

scholarly journals Design and Analysis of Broadband LiNbO3 Optical Waveguide Electric Field Sensor with Tapered Antenna

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3672
Author(s):  
Haiying Lu ◽  
Yingna Li ◽  
Jiahong Zhang
Keyword(s):  
Electric Field ◽  
Resonance Frequency ◽  
Optical Waveguide ◽  
Three Dimensional ◽  
Great Influence ◽  
Simulation Software ◽  
Substrate Thickness ◽  
Electric Field Sensor ◽  
Field Sensor ◽  
Simulation Results

The three-dimensional (3D) simulation model of a lithium niobate (LiNbO3, LN) optical waveguide (OWG) electric field sensor has been established by using the full-wave electromagnetic simulation software. The influences of the LN substrate and the packaging material on the resonance frequency of the integrated OWG electric field sensor have been simulated and analyzed. The simulation results show that the thickness of the LN substrate has a great influence on the resonant frequency of the sensor (≈33.4%). A sensor with a substrate thickness of 1 mm has been designed, fabricated, and experimentally investigated. Experimental results indicate that the measured resonance frequency is 7.5 GHz, which nearly coincides with the simulation results. Moreover, the sensor can be used for the measurement of the nanosecond electromagnetic impulse (NEMP) in the time domain from 1.29 kV/m to 100.97 kV/m.

scholarly journals Analysis of Resonance Response Performance of C-Band Antenna Using Parasitic Element

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
M. R. Zaman ◽  
M. T. Islam ◽  
N. Misran ◽  
J. S. Mandeep
Keyword(s):  
Resonance Frequency ◽  
Ground Plane ◽  
Dual Band ◽  
Fractional Bandwidth ◽  
Parasitic Element ◽  
Microstrip Lines ◽  
Dual Band Antenna ◽  
Lower Band ◽  
Resonance Response ◽  
Response Performance

Analysis of the resonance response improvement of a planar C-band (4–8 GHz) antenna is proposed using parasitic element method. This parasitic element based method is validated for change in the active and parasitic antenna elements. A novel dual-band antenna for C-band application covering 5.7 GHz and 7.6 GHz is designed and fabricated. The antenna is composed of circular parasitic element with unequal microstrip lines at both sides and a rectangular partial ground plane. A fractional bandwidth of 13.5% has been achieved from 5.5 GHz to 6.3 GHz (WLAN band) for the lower band. The upper band covers from 7.1 GHz to 8 GHz with a fractional bandwidth of 12%. A gain of 6.4 dBi is achieved at the lower frequency and 4 dBi is achieved at the upper frequency. The VSWR of the antenna is less than 2 at the resonance frequency.

scholarly journals Design and Simulation of Horizontally placed H-shaped Fractal Antenna

2019 ◽  
Vol 9 (1) ◽  
pp. 1272-1276
Keyword(s):  
Standing Wave ◽  
Return Loss ◽  
Fractal Structure ◽  
Simulation Software ◽  
Voltage Standing Wave Ratio ◽  
Fractal Antenna ◽  
Feeding Method ◽  
The Third ◽  
Multiple Frequencies ◽  
Number Of Iterations

The design and simulation of horizontally placed H-Shaped Fractal Antenna is presented in this paper using CST Microwave Studio simulation software and the excitation is provided by using Nickel material for feeding in Y direction, wave guide port feeding method is used.. The simulated result shows that by edge cutting the directivity increases, return loss is very less and the voltage standing wave ratio is nearly equal to unity as the number of iterations increases. In generating multiple frequencies., the horizontally placed H shape fractal structure is advantageous. This antenna can be used in the Wi-Fi due to its better performance in Return loss, VSWR and directivity. In this paper four stages of this antenna is designed and simulated, the third iteration of this antenna is fabricated for Return loss and VSWR. The observations are conducted on antenna parameters such as the return loss for the frequency of 9.5 GHz is -27.6 dB and observed nearly equal value for measured results. The VSWR of both simulated and measured results are also same.

Orthogonally Integrated Hybrid Antenna for Intelligent Transportation Systems

2021 ◽  
Vol 36 (5) ◽  
pp. 519-525
Author(s):  
Syedakbar Syedyusuff ◽  
Ramesh Subramaniam ◽  
Ramya Vijay
Keyword(s):  
Excellent Agreement ◽  
Intelligent Transportation Systems ◽  
High Frequency ◽  
Ground Plane ◽  
Intelligent Transportation ◽  
Transportation Systems ◽  
High Frequency Structure Simulator ◽  
Simulation Results ◽  
Isolation Effects ◽  
Defected Ground Plane

The aim of this paper is to design an orthogonally integrated hybrid antenna to address 5G/Wi-Fi/C-V2X communication simultaneously in one device. The proposed antenna consists of three planar monopoles and a defected ground plane with a dimension of 55x30x1.2mm3. High Frequency Structure Simulator (HFSS) is employed to design the proposed antenna, which resonates at three distinct frequencies 2.45 GHz (Wi-Fi), 3.5 GHz (5G), and 5.9 GHz. Further, the prototype antenna is fabricated and experimentally validated in comparing with simulation results. The excellent agreement among the simulation and measured results shows that the designed antenna operates simultaneously at 5G/Wi-Fi/C-V2X frequency bands and the isolation effects between the elements is less than 15dB.

Design and Simulation of S-Band Low Noise Amplifier Based on ATF-54143

2014 ◽  
Vol 577 ◽  
pp. 615-619
Author(s):  
Hai Peng Wang ◽  
Shu Hui Yang ◽  
Meng Lu Feng ◽  
Yin Chao Chen
Keyword(s):  
Standing Wave ◽  
Output Voltage ◽  
Noise Figure ◽  
High Electron Mobility Transistor ◽  
Input Voltage ◽  
Low Noise ◽  
Simulation Software ◽  
Voltage Standing Wave Ratio ◽  
High Electron ◽  
Noise Amplifier

This design used a low noise enhanced high electron mobility transistor ATF54143 and Agilent's ADS simulation software to achieve the good performance of operating frequency at 2.45GHz, noise figure (NF) is less than 0.8dB, band gain (S21) is greater than 15dB, input voltage standing-wave ratio (VSWR1) is less than 1.4dB, output voltage standing-wave ratio (VSWR2) is less than 1.6dB.

Design and Simulation of a Wide-Band LPDA

2014 ◽  
Vol 687-691 ◽  
pp. 4024-4028
Author(s):  
Si Hao Wang ◽  
Yong Li ◽  
Shen Ke Zhang
Keyword(s):  
Performance Analysis ◽  
Computer Simulations ◽  
Frequency Band ◽  
Optimization Design ◽  
Low Cost ◽  
Wide Band ◽  
Simulation Software ◽  
Simulation Results ◽  
Design Construction ◽  
A Performance

A reconfigurable wideband Log-Periodic Dipole Array (LPDA) is here in introduced. Built utilizing low cost it can cover frequencies from 0.2GHz to 2GHz, through the discrete adjustment of its elements. The gain of antenna in a given frequency band of operation can also be changed by the reconfiguration of its elements. The design, construction and testing processes are discussed and a performance analysis is made based on computer simulations. In this paper simulation software HFSS is used to get the optimization design of LPDA, and the simulation results are agree with the experimental dates appropriately.

scholarly journals Development of a Semielliptical Partial Ground Plane Antenna for RFID and GSM-900

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
M. R. Zaman ◽  
R. Azim ◽  
N. Misran ◽  
M. F. Asillam ◽  
T. Islam
Keyword(s):  
Mobile Communications ◽  
Radio Frequency Identification ◽  
Ground Plane ◽  
Simulation Software ◽  
Planar Antenna ◽  
Fractional Bandwidth ◽  
Feed Line ◽  
Response Change ◽  
Frequency Identification ◽  
Good Agreement

A novel compact broadband patch antenna for UHF (ultrahigh frequency), RFID (radio frequency identification), and GSM-900 (global system for mobile communications) band is shown in this paper. The antenna is composed of an ellipse shape annular ring at the patch. The ground plane of the planar antenna is modified with a semiellipse shape slot. The structure can generate substantial amount of current at the feed-line. The geometry of the antenna is evaluated by using HFSS simulation software and deliberated across the paper. Parametric study is exhibited to delineate the response change of the antenna. The antenna has a physical width of 0.24 λand length of 0.3 λ. It covers a frequency starting from 0.9 GHz to 1.08 GHz. A fractional bandwidth of 18.2% has been achieved from 0.9 GHz till 1.08 GHz. An average gain of 5.5 dBi is achieved at the resonance frequency. The simulated and measured results have good agreement.

scholarly journals A Numerical Study on the Combustion Process and Emission Characteristics of a Natural Gas-Diesel Dual-Fuel Marine Engine at Full Load

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1342
Author(s):  
Van Chien Pham ◽  
Jae-Hyuk Choi ◽  
Beom-Seok Rho ◽  
Jun-Soo Kim ◽  
Kyunam Park ◽  
...  
Keyword(s):  
Natural Gas ◽  
Combustion Process ◽  
Simulation Software ◽  
Dual Fuel ◽  
Injection Timing ◽  
Emission Characteristics ◽  
Cylinder Pressure ◽  
Marine Engine ◽  
Full Load ◽  
Simulation Results

This paper presents research on the combustion and emission characteristics of a four-stroke Natural gas–Diesel dual-fuel marine engine at full load. The AVL FIRE R2018a (AVL List GmbH, Graz, Austria) simulation software was used to conduct three-dimensional simulations of the combustion process and emission formations inside the engine cylinder in both diesel and dual-fuel mode to analyze the in-cylinder pressure, temperature, and emission characteristics. The simulation results were then compared and showed a good agreement with the measured values reported in the engine’s shop test technical data. The simulation results showed reductions in the in-cylinder pressure and temperature peaks by 1.7% and 6.75%, while NO, soot, CO, and CO2 emissions were reduced up to 96%, 96%, 86%, and 15.9%, respectively, in the dual-fuel mode in comparison with the diesel mode. The results also show better and more uniform combustion at the late stage of the combustions inside the cylinder when operating the engine in the dual-fuel mode. Analyzing the emission characteristics and the engine performance when the injection timing varies shows that, operating the engine in the dual-fuel mode with an injection timing of 12 crank angle degrees before the top dead center is the best solution to reduce emissions while keeping the optimal engine power.

Research on Very Fast Transient over-Voltages Distribution in Large Power Transformer Windings

2012 ◽  
Vol 433-440 ◽  
pp. 7287-7292
Author(s):  
You Hua Gao ◽  
Zeng Feng Lai ◽  
Xiao Ming Liu ◽  
Guo Wei Liu ◽  
Ye Wang
Keyword(s):  
Power Transformer ◽  
Simulation Software ◽  
Large Power ◽  
Telegraph Equations ◽  
Backward Differentiation Formulas ◽  
Space Discretization ◽  
Simulation Results ◽  
Fast Transient ◽  
The Time Domain ◽  
Differentiation Formulas

To analyze the transient response of transformer windings under very fast transient over-voltage (VFTO), multi-conductor transmission line (MTL) model based on the representation of transformer windings by its individual turns are established. Space discretization is needed for solving the time-domain telegraph equations of MTL. To calculate the voltage distributions along transformer windings, through combining the compact finite difference (CFD) theory and the backward differentiation formulas (BDF). Simulation software ATP is introduced, and the simulation results demonstrate that the proposed approach is feasible.

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