scholarly journals Design and Validation of an Antipodal Vivaldi Antenna with Additional Slots

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Marek Dvorsky ◽  
Harihara S. Ganesh ◽  
S. Sadhish Prabhu
Keyword(s):  
Linear Polarization ◽  
Dielectric Substrate ◽  
Substrate Material ◽  
Radiation Efficiency ◽  
Operating Frequency ◽  
Frequency Range ◽  
High Radiation ◽  
Maximum Gain ◽  
Operating Frequency Range ◽  
Vivaldi Antenna

This paper introduces an improved shape of Antipodal Vivaldi Antenna from the normal schematic structure which yields a high radiation gain. We have designed and fabricated the improved structure of Antipodal Vivaldi Antenna with the help of new dielectric substrate ASTRA®MT77 material. We have chosen a unique substrate material to develop our novel Antipodal Vivaldi Antenna because most research has been done on commonly used materials like FR4, RT Duroid, etc. Moreover, ISOLA has significantly good electrical and nonelectrical properties as compared with other substrate materials. The results of the desired antenna were simulated through extensive simulations performed in CST Microwave Studio®. The characteristics of all the antenna parameters are clearly studied and we are successful to achieve closed results between designed as well as experimented Vivaldi Antenna. The simulated antenna achieved a maximum gain of more than 9 dBi whereas the experimental antenna reached around 7 dBi between the operating frequency range from 1 GHz to 13 GHz. The measured prototype antenna provides linear polarization with overall radiation efficiency of more than 90%.

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.

Design and Simulation of Airborne Circular Omni-Directional Slot Antenna

2014 ◽  
Vol 989-994 ◽  
pp. 3497-3500
Author(s):  
Luo Ren ◽  
Yong Zhong Zhu ◽  
Dan Su ◽  
Xin Deng
Keyword(s):  
Microstrip Antenna ◽  
Directional Antenna ◽  
Monopole Antenna ◽  
Slot Antenna ◽  
Operating Frequency ◽  
Frequency Range ◽  
Maximum Gain ◽  
Antenna Miniaturization ◽  
Operating Frequency Range ◽  
The Common

The airborne omni-directional antenna must not only satisfy the indicators of omni-directional horizontal requirements, but also have conformal shape with the surface of airplane. The common monopole antenna and microstrip antenna can not meet the above requirements. Under the background of the airborne antenna miniaturization and conformal demand, this article designs a kind of airborne circular slot antenna. The structure of the antenna is simple, which meets pattern VSWR < 1.4 bandwidth of 350 MHz to 376 MHz and meets pattern VSWR < 2 bandwidth of 338 MHz to 438 MHz .Its maximum gain within the operating frequency range can be 4.205 dB .

Experimental Research on an Antipodal Vivaldi Antenna with Wide Band

2013 ◽  
Vol 631-632 ◽  
pp. 1022-1025 ◽  
Author(s):  
Ming Jiang ◽  
Li Zhong Song ◽  
Xin Tong ◽  
Liang Fang
Keyword(s):  
Experimental Research ◽  
Wide Band ◽  
Operating Frequency ◽  
Electronic Systems ◽  
Practical Application ◽  
Frequency Range ◽  
Operating Frequency Range ◽  
Vivaldi Antenna ◽  
Simulation Parameters ◽  
Vivaldi Antennas

The Vivaldi antenna is a kind of wide band antenna, which is widely used in many wide band electronic systems. This paper designed and fabricated a specific antipodal Vivaldi antenna (AVA) for practical application. The operating frequency range of fabricated AVA is from 2 GHz to 11GHz. The length and width of the fabricated AVA are 92.7millimeter and 110.4millimeter, respectively. A practical AVA was fabricated according to simulation parameters. The experimental results of the AVA are provided and analyzed. For the fabricated AVA, the measured average voltage standing wave ratio (VSWR) is 2 and gains are higher than 0 dB within the operating frequency range. Meanwhile, the wide beam performances are also observed. The experimental research on the AVA can be as a technical reference for the design and implementation of other Vivaldi antennas.

Extracting Maximum Power in the Presence of Internal Inductance of Electromagnetic Energy Harvesting Systems

2020 ◽  
Author(s):  
Yamini Sharma ◽  
Lei Zuo
Keyword(s):  
Energy Harvesting ◽  
Electromagnetic Energy ◽  
Maximum Power ◽  
Operating Frequency ◽  
Frequency Range ◽  
Low Frequencies ◽  
Internal Inductance ◽  
Piezoelectric Energy ◽  
Operating Frequency Range ◽  
Electromagnetic Energy Harvesting

Abstract In this paper, the effect of internal inductance of electromagnetic generators in the field of energy harvesting is discussed. Electromagnetic energy harvesters are typically operated at low frequencies. This results in the generator internal inductor impedance being significantly less than the generator internal resistance. However, at high frequencies, this inductance can no longer be ignored. Therefore, to maximize the harvested power, the internal inductance must be considered while designing the power electronics. This paper presents two methods to tackle this issue. The first method involves making use of a discrete capacitor which is able to reduce the inductance effect not just at resonant frequency but for the entire operating frequency range. The second method makes use of a concept similar to synchronized switching harvesting on inductors (SSHI) in piezoelectric energy harvesting. A capacitor and switch are added in the electromagnetic energy harvesting circuit to reduce the generator internal inductance effect. This method not only provides the benefit of performing well in the entire operating frequency range but also eliminates the need for precise maximum power tracking techniques, which further helps in reducing the circuit losses. Simulation results show a maximum power output increase of 56%.

PERFORMANCE ANALYSIS OF AN ENGINE MOUNT FEATURING ER FLUIDS AND PIEZOACTUATORS

1996 ◽  
Vol 10 (23n24) ◽  
pp. 3143-3157 ◽  
Author(s):  
S.H. CHOI ◽  
Y.T. CHOI ◽  
S.B. CHOI ◽  
C.C. CHEONG
Keyword(s):  
Electric Field ◽  
Frequency Domain ◽  
Control Technique ◽  
Operating Frequency ◽  
Frequency Range ◽  
Engine Mounts ◽  
Operating Frequency Range ◽  
Engine Mount ◽  
Er Fluids ◽  
Er Fluid

Conventional rubber mounts and various types of passive or semi-active hydraulic engine mounts for a passenger vehicle have their own functional aims on the limited frequency band in the broad engine operating frequency range. In order to achieve high system performance over all frequency ranges of the engine operation, a new type of engine mount featuring electro-rheological(ER) fluids and piezoactuators is proposed in this study. A mathematical model of the proposed engine mount is derived using the bond graph method which is inherently adequate to model the interconnected hydromechanical system. In the low frequency domain, the ER fluid is activated upon imposing an electric field for vibration isolation while the piezoactuator is activated in the high frequency domain. A neuro-control algorithm is utilized to determine control electric field for the ER fluid, and H∞ control technique is adopted for the piezoactuator Comparative works between the proposed and single-actuating(ER fluid only or piezoactuator only) engine mounts are undertaken by evaluating force transmissibility over a wide operating frequency range.

scholarly journals Гибридный металлополимер как потенциальная активная среда оптоакустического генератора

2022 ◽  
Vol 48 (3) ◽  
pp. 36
Author(s):  
Е.И. Гиршова ◽  
Е.П. Микитчук ◽  
А.В. Белоновский ◽  
К.М. Морозов
Keyword(s):  
Silver Nanoparticles ◽  
Active Medium ◽  
Hybrid Material ◽  
Volume Fraction ◽  
Silver Content ◽  
Thermodynamic Characteristics ◽  
Operating Frequency ◽  
Frequency Range ◽  
Volume Fractions ◽  
Operating Frequency Range

A hybrid material was studied, consisting of polydimethylsiloxane and silver nanoparticles distributed throughout its volume, its optical and thermodynamic characteristics were calculated for different volume fractions of silver content. It is theoretically shown that this material with a volume fraction of silver of about 30% can be used as an active medium for an optoacoustic transducer with an operating frequency range of about 10 MHz.

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