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Alaa Nadim Salman,Shokri Almekdad,Mohamad Alhariri
Pág. 186 - 192
Successfully achieving the mission of the unmanned aerial vehicle (UAV) requiring a high gain data link between the UAV and the ground control station (GCS). The antenna of the ground station must has a narrow, precisely guided beam towards the UAV. Wide...
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Bence Tóth, János Vad, Gábor Kotán
Pág. 261 - 268
The aim of this paper is to present two acoustic beamforming methods developed for rotating sources, namely the Rotating Source Identifier (ROSI) and the Virtual Rotating Array method (VRAM). These were applied onto a series of simulated test cases, and ...
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Sudantha Perera, Yan Zhang, Dusan Zrnic and Richard Doviak
Electromagnetic (EM) simulation of dual-polarized antennas is necessary for precise initial alignments, calibration and performance predictions of multi-function phased array radar systems. To achieve the required flexibility and scalability, a novel Fin...
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Sudantha Perera, Yan Zhang, Dusan Zrnic and Richard Doviak
Electromagnetic (EM) simulation of dual-polarized antennas is necessary for precise initial alignments, calibration and performance predictions of multi-function phased array radar systems. To achieve the required flexibility and scalability, a novel Fin...
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S. Ponseenivasan, Anish Kumar and K. V. Rajkumar
For the narrow gap dissimilar weld between a ferritic steel and a nickel base superalloy, a nickel base alloy buttering layer is deposited on the ferritic steel side as an intermediate layer. The bonding between the buttering layer and the ferritic steel...
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Ekaterina Lopukhova, Ansaf Abdulnagimov, Grigory Voronkov, Ruslan Kutluyarov and Elizaveta Grakhova
In intelligent transportation systems, an important task is to provide a highly efficient communication channel between vehicles and other infrastructure objects that meets energy efficiency requirements and involves low time delays. The paper presents a...
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Jeong-Geun Kim and Donghyun Baek
This paper presents a Ku-band transmit and receive IC in 0.13 µm CMOS technology for mobile satellite communication beamforming systems. A Ku-band transmit and receive IC is composed of a bi-directional amplifier, a 6-bit phase shifter, and a 6-bit digit...
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Jeong-Geun Kim and Kang-Hee Lee
In this paper, a 4-bit digital step attenuator using 0.25 µm GaN HEMT technology for wideband radar systems is presented. A switched-path attenuator topology with resistive T-type attenuators and double-pole double-throw (DPDT) switches was used to achie...
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Hsun-Yuan Chi, Wei Hong, Hsuan Lai, Shih-Hsiang Hsu and Che-Chang Chang
In this paper, a silicon ribbon (SR)-based microstructure is developed and added to a 32-channel optical phased array (OPA) to reduce the crosstalk between the antennas of grating waveguides. The spacing between the chirped grating antennas can be as clo...
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Mohammad Ebrahim Bajgholi, Gilles Rousseau, Martin Viens and Denis Thibault
This paper presents the results of a project aimed at evaluating the performance of ultrasonic techniques for detecting flaws in Francis turbine runners. This work is the first phase of a more ambitious program aimed at improving the reliability of inspe...
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Dipankar Mitra, Sukrith Dev, Jacob Lewis, Jerika Cleveland, Monica S. Allen, Jeffery W. Allen and Benjamin D. Braaten
The proposed array will have future applications in structurally integrated and conformal phased array antennas for wireless communications, radars, and sensing where antenna performance is a function of structural and mechanical restraints.
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Naser Ojaroudi Parchin, Mohammad Alibakhshikenari, Haleh Jahanbakhsh Basherlou, Raed A. Abd-Alhameed, Jonathan Rodriguez and Ernesto Limiti
The focus of this manuscript was to propose a new phased array antenna design for the fifth generation (5G) mobile platforms. Eight elements of compact Quasi-Yagi antennas were placed on the top portion of smartphone printed circuits board (PCB) to form ...
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Hadi Teguh Yudistira
Pág. 19 - 24
Finite Diffrence Time Domain merupakan metode simulasi yang digunakan dalam simulasi gelombang elektromagnetik dimana mengunakan prinsip dasar pendekatan numerik dari persamaan differensial dalam domain ruang dan waktu. Phased array antenna merupakan sal...
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Esztella Balla, János Vad
Pág. 122 - 129
The paper presents wind tunnel experiments, supplemented with phased array microphone measurements, on 2D basic models of low-speed axial fan blade sections: a flat plate, a cambered plate, and a RAF6-E airfoil. It aims at documenting the establishment o...
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Andrew Mahre, Tian-You Yu, Robert D. Palmer and James M. Kurdzo
While the vertical structure of cold fronts has been studied using various methods, previous research has shown that traditional methods of observing meteorological phenomena (such as pencil-beam radars in PPI/volumetric mode) are not well-suited for res...
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Bence Tóth, János Vad
Pág. 152 - 158
Axial fans operate in large numbers, often in the close vicinity of humans, therefore reducing their noise is a primary concern. In this paper, beamforming is applied to get information about the location and strength of noise sources on the rotor. This ...
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Xining Yu, Yan Zhang, Ankit Patel, Allen Zahrai and Mark Weber
This paper investigates the feasibility of a backend design for real-time, multiple-channel processing digital phased array system, particularly for high-performance embedded computing platforms constructed of general purpose digital signal processors. F...
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Tamás Kalmár-Nagy, Bendegúz Dezso Bak, Tamás Benedek, János Vad
Pág. 109 - 113
We describe a mechanical/acoustic study of a short-ducted axial flow fan. The purpose is to compare mechanical noise to that caused by flow phenomena.The eigenfrequencies of the fan are identified through measurement and finite element computations. The ...
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Tamás Benedek, Péter Tóth
Pág. 37 - 46
This paper summarizes a case study example on the methodology used for phased array microphone measurements in a realistic acoustic environment. A ducted fan rotor is measured in an environment, where structure born noise and aerodynamically generated no...
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Seok Kim, Chan-Mi Song, Seung-Hun Lee, Sung-Chan Song and Hyun-Ung Oh
The small synthetic aperture radar (SAR) technology experimental project (S-STEP) mission aims to develop an innovative spaceborne SAR microsatellite as a constellation of 32 microsatellites featuring a high-resolution stripmap mode of 1 m. The S-STEP is...
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