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Journal articles on the topic 'Small aperture active phased array'

Author: Grafiati

Published: 6 September 2023

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1

Lu, Junqi, and Yongxin Guo. "Compact Planar Sparse Array Antenna with Optimum Element Dimensions for SATCOM Ground Terminals." International Journal of Antennas and Propagation 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/806981.

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A novel antenna array architecture for low-cost and compact SATCOM mobile terminal is presented. Based on equal-amplitude aperiodic phased array with fewer active chain numbers, it possesses advantages including lower weight, less cost, and higher power efficiency compared to conventional periodic phased arrays. It is implemented with printed patch antenna so that it guarantees compactness. The elements position and dimensions are jointly designed, with an effective sparse array synthesis strategy that takes actual patch antenna design constraint into consideration, to obtain a maximum array a

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2

Shi, Wei, Zuping Qian, Jun Zhou, Xinbo Qu, Yang Xiang, and Liu Hong. "A Small Ku-Band Polarization Tracking Active Phased Array for Mobile Satellite Communications." International Journal of Antennas and Propagation 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/747629.

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A compact polarization tracking active phased array for Ku-band mobile satellite signal reception is presented. In contrast with conventional mechanically tracking antennas, the approach presented here meets the requirements of beam tracking and polarization tracking simultaneously without any servo components. The two-layer stacked square patch fed by two probes is used as antenna element. The impedance bandwidth of 16% for the element covers the operating frequency range from 12.25 GHz to 12.75 GHz. In the presence of mutual coupling, the dimensional parameters for each element of the small

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3

Luo, Xuan, Jun Ouyang, Zhihui Chen, Lei Han, and Wei Yan. "A Low-Profile 36-Element K-Band Active Phased Array for Ultra-Small Aperture Application." IEEE Access 8 (2020): 62286–97. http://dx.doi.org/10.1109/access.2020.2983604.

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4

Knott, Peter, Thomas Bertuch, Helmut Wilden, Olaf Peters, Andreas R. Brenner, and Ingo Walterscheid. "SAR Experiments Using a Conformal Antenna Array Radar Demonstrator." International Journal of Antennas and Propagation 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/142542.

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Conformal antenna arrays have been studied for several years but only few examples of applications in modern radar or communication systems may be found up to date due to technological difficulties. The objective of the “Electronic Radar with Conformal Array Antenna” (ERAKO) demonstrator system which has been developed at the Fraunhofer Institute for High Frequency Physics and Radar Techniques (FHR) is to demonstrate the feasibility of an active electronically scanned antenna for conformal integration into small and medium sized airborne platforms. For practical trials the antenna has been ada

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5

Liu, Rong, Naizhi Wang, Tong Li, Ruoqiao Zhang, and Hongchao Wu. "X-Band Active Phased Array Antenna Using Dual-Port Waveguide for High-Power Microwave Applications." Electronics 11, no. 23 (2022): 4064. http://dx.doi.org/10.3390/electronics11234064.

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An X-band active phased array horn antenna with high power capacity and high peak power is proposed in this paper. At the horn aperture, the baffles are loaded to suppress higher-order modes and eliminate blind spots during beam scanning. Straight walls are added to improve impedance matching. Considering that the peak power that T/R modules can provide is very limited, the proposal of a dual-port waveguide breaks through the bottleneck of the power capacity of a single-port input for the first time. The proposed curved dual-port waveguide is used to connect the horn antenna and the T/R module

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6

Krüger, Frank, Torsten Dahm, and Katrin Hannemann. "Mapping of Eastern North Atlantic Ocean seismicity from Po/So observations at a mid-aperture seismological broad-band deep sea array." Geophysical Journal International 221, no. 2 (2020): 1055–80. http://dx.doi.org/10.1093/gji/ggaa054.

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SUMMARY A mid-aperture broad-band test array (OBS array DOCTAR) was deployed from June 2011 to April 2012 about 100 km north of the Gloria fault in the Eastern North Atlantic in about 5000 m water depth. In addition arrays were installed on Madeira Island and in western Portugal mainland. For the first time in the Eastern North Atlantic, we recorded a large number of high frequency Po and So waves from local and regional small and moderate earthquakes (ML &lt; 4). An incoherent beamforming method was adapted to scan continuous data for such Po and So arrivals applying a sliding window wave

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7

Kim, Seok, Chan-Mi Song, Seung-Hun Lee, Sung-Chan Song, and Hyun-Ung Oh. "Design and Performance of X-Band SAR Payload for 80 kg Class Flat-Panel-Type Microsatellite Based on Active Phased Array Antenna." Aerospace 9, no. 4 (2022): 213. http://dx.doi.org/10.3390/aerospace9040213.

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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 a spaceborne SAR microsatellite technology demonstration program in which innovative approaches have been proposed and investigated for SAR payload system designs for improving the development speed, affordability, size and weight parameters, and quality of SAR satellite systems. In this study, the major design approach includes a bus–payload

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8

Kojima, Yuki, Kazuo Oki, Kosuke Noborio, and Masaru Mizoguchi. "Estimating Soil Moisture Distributions across Small Farm Fields with ALOS/PALSAR." International Scholarly Research Notices 2016 (July 26, 2016): 1–8. http://dx.doi.org/10.1155/2016/4203783.

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The ALOS (advanced land observing satellite) has an active microwave sensor, PALSAR (phased array L-band synthetic aperture radar), which has a fine resolution of 6.5 m. Because of the fine resolution, PALSAR provides the possibility of estimating soil moisture distributions in small farmlands. Making such small-scale estimates has not been available with traditional satellite remote sensing techniques. In this study, the relationship between microwave backscattering coefficient (σ) measured with PALSAR and ground-based soil moisture was determined to investigate the performance of PALSAR for

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9

Morabito, Simona, Paola Cusano, Danilo Galluzzo, et al. "One-Year Seismic Survey of the Tectonic CO2-Rich Site of Mefite d’Ansanto (Southern Italy): Preliminary Insights in the Seismic Noise Wavefield." Sensors 23, no. 3 (2023): 1630. http://dx.doi.org/10.3390/s23031630.

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A passive seismic experiment is carried out at the non-volcanic highly degassing site of Mefite d’Ansanto located at the northern tip of the Irpinia region (southern Italy), where the 1980 MS 6.9 destructive earthquake occurred. Between 2020 and 2021, background seismic noise was recorded by deploying a broadband seismic station and a seismic array composed of seven 1 Hz three-component sensors. Using two different array configurations, we were allowed to explore in detail the 1–20 Hz frequency band of the seismic noise wavefield as well as Rayleigh wave phase velocities in the 400–800 m/s ran

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Govorčin, Marin, Boško Pribičević, and Shimon Wdowinski. "Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations." Sensors 19, no. 22 (2019): 4857. http://dx.doi.org/10.3390/s19224857.

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The wider Zagreb area is considered one of the few seismically active areas in the Republic of Croatia. During the period 1880–1906, moderate to strong seismic activity with three earthquakes magnitude M L ≥ 6 occurred on the NW-SE striking Kašina Fault and since then, the area has not experienced earthquakes exceeding magnitude M L = 5 . In order to estimate the ongoing interseismic strain accumulation along the fault, we analyze Advanced Land Observing Satellite (ALOS) Phased Array L-band SAR (PALSAR) and Environmental Satellite (Envisat)-Advanced Synthetic Aperture Radar (ASAR) datasets acq

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11

Gu, Chunwang, Hao Liu, and Min Yi. "Lightweight Fan-Beam Microstrip Grid Antenna for Airborne Microwave Interferometric Radiometer Applications." Micromachines 14, no. 1 (2023): 228. http://dx.doi.org/10.3390/mi14010228.

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The microwave interferometric radiometer (MIR) uses aperture synthesis technology to equate multiple small-aperture antennas into a large-aperture antenna to improve spatial resolution. At present, MIR antennas that operate at frequencies above the C-band mostly use horn antennas, waveguide slot antennas, etc., which have the disadvantages of a high profile and large mass. In this paper, a new type of miniaturized, low-profile, and lightweight K-band fan-beam microstrip grid antenna is designed for the airborne campaign of the K-band one-dimensional MIR of a Microwave Imager Combined Active an

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Mizuochi, Hiroki, Masato Hayashi, and Takeo Tadono. "Development of an Operational Algorithm for Automated Deforestation Mapping via the Bayesian Integration of Long-Term Optical and Microwave Satellite Data." Remote Sensing 11, no. 17 (2019): 2038. http://dx.doi.org/10.3390/rs11172038.

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The frequent fine-scale monitoring of deforestation using satellite sensors is important for the sustainable management of forests. Traditional optical satellite sensors suffer from cloud interruption, particularly in tropical regions, and recent active microwave sensors (i.e., synthetic aperture radar) demonstrate the difficulty in data interpretation owing to their inherent sensor noise and complicated backscatter features of forests. Although the sensor integration of optical and microwave sensors is of compelling research interest, particularly in the conduct of deforestation monitoring, t

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13

Brokešová, Johana, Jiří Málek, Jiří Vackář, Felix Bernauer, Joachim Wassermann, and Heiner Igel. "Rotaphone-CY: The Newest Rotaphone Model Design and Preliminary Results from Performance Tests with Active Seismic Sources." Sensors 21, no. 2 (2021): 562. http://dx.doi.org/10.3390/s21020562.

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Rotaphone-CY is a six-component short-period seismograph that is capable of the co-located recording of three translational (ground velocity) components along three orthogonal axes and three rotational (rotation rate) components around the three axes in one device. It is a mechanical sensor system utilizing records from elemental sensors (geophones) arranged in parallel pairs to derive differential motions in the pairs. The pairs are attached to a rigid frame that is anchored to the ground. The model design, the latest one among various Rotaphone designs based on the same principle and present

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14

Birring, Anmol. "Optimizing Probe Active Aperture for Phased Array Weld Inspections." Materials Evaluation 79, no. 8 (2021): 797–804. http://dx.doi.org/10.32548/2021.me-04220.

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Phased array ultrasonic testing (PAUT) has become a popular nondestructive technique for weld inspections in piping, pressure vessels, and other components such as turbines. This technique can be used both in manual and automated modes. PAUT is more attractive than conventional angle-beam ultrasonic testing (UT), as it sweeps the beam through a range of angles and presents a cross-sectional image of the area of interest. Other displays are also available depending on the software. Unlike traditional A-scan instruments, which require the reconstruction of B- and C-scan images from raster scanni

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15

Demmer, David, Francesco Foglia Manzillo, Samara Gharbieh, et al. "Hybrid Precoding Applied to Multi-Beam Transmitting Reconfigurable Intelligent Surfaces (T-RIS)." Electronics 12, no. 5 (2023): 1162. http://dx.doi.org/10.3390/electronics12051162.

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In this work, we study hybrid precoding techniques applied to multi-user Transmitting Reconfigurable Intelligent Surface (T-RIS) systems. The T-RIS considered here is a large array of electronically reconfigurable antenna elements illuminated by a small set of active sources. When it comes to digital signal-processing techniques applied to T-RIS systems, it is necessary to consider realistic models to bridge the gap with theoretical results. For this reason, we propose a multi-beam T-RIS propagation model with strong phase quantization constraints and limited beam codebooks. First, the propose

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16

Aminev, A. M., A. V. Gilev, D. Yu Grishin, V. E. Zaytsev, and V. N. Sergeev. "Automated active phased array control stand software." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 4 (December 30, 2019): 93–102. http://dx.doi.org/10.38013/2542-0542-2019-4-93-102.

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The study suggests using a software platform for multidimensional data cubes in automated active phased array control stands. The application of the platform greatly facilitates and accelerates the display and analysis of very large volumes of data coming from large-aperture active phased arrays during the measurement process, so that the end user can make spontaneous data requests. The study shows the prospects of using this platform for radar systems as a whole.

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17

Shishov, Yu A., D. V. Gubanov, and M. G. Vakhlov. "Calibration of receiving-transmitting channels of large-aperture active phased antenna array." Issues of radio electronics, no. 11 (January 18, 2021): 30–36. http://dx.doi.org/10.21778/2218-5453-2020-11-30-36.

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18

NagaPavani, G., Ch Lakshmi Prasanna, and Dr N.N. Sastry. "An ultra-wide band printed small aperture tapered slot phased array antenna covering 6-18GHZ." International Journal of Engineering & Technology 7, no. 4 (2018): 2628. http://dx.doi.org/10.14419/ijet.v7i2.18.12763.

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For phased array applications covering ultra wide bandwidth, it is necessary to restrict the size of the aperture to less than λ/2 at highest frequency of operation. For 6-18 GHz coverage, an aperture size of less than 9.76mm is required for scanning to ±450 without appearance of grating lobes and occurrence of element pattern nulls over the band. Meeting this requirement a printed tapered slot antenna has been designed with the above aperture size. Detailed parametric studies have been carried out over 6-18 GHz and dimensions have been opti-mized for return loss. The design has been carried o

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19

Gribanov, A. N., S. E. Gavrilova, O. V. Pavlovich, G. F. Moseychuk, and A. N. Titov. "Method of forming and scaling phased array expanded beams." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 3 (September 30, 2019): 19–29. http://dx.doi.org/10.38013/2542-0542-2019-3-19-29.

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The paper focuses on the phase synthesis of one-dimensionally expanded phased array beams. In the study we used the fan partial diagram method. By this method and applying the known amplitude distribution in the aperture and the desired beam shape, we were able to unambiguously determine the desired phase distribution by means of simple calculations. The method is applicable for a phased antenna array and an active phased antenna array with linear and flat apertures. The study is the first to discuss the scaling properties of expanded beams, which allow one to obtain many synthesis options fro

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20

Won, Young-Jin, Kyun Ho Lee, and Jae-Hyun Lee. "Performance Improvement of Spaceborne SAR Using Antenna Pattern Synthesis Based on Quantum-Behaved Particle Swarm Optimization." International Journal of Antennas and Propagation 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/6928970.

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This study improves the performance of a spaceborne synthetic aperture radar (SAR) system using an antenna mask design method and antenna pattern synthesis algorithms for an active phased array SAR system. The SAR antenna is an important component that affects the SAR system performance because it is closely related to the antenna pattern. This study proposes a method for antenna mask design that is based on several previous studies as well as the antenna pattern synthesis algorithm, which is based on quantum-behaved particle swarm optimization (QPSO) for an active phased array SAR system. The

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21

Kuznetsov, Grigory, Vladimir Temchenko, Maxim Miloserdov, and Dmitry Voskresenskiy. "Modifications of active phased antenna arrays near-field diagnosis method based on compressive sensing." International Journal of Microwave and Wireless Technologies 11, no. 7 (2019): 568–76. http://dx.doi.org/10.1017/s1759078719000989.

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AbstractThis paper presents two modifications of compressive sensing (CS)-based approach applied to the near-field diagnosis of active phased arrays. CS-based antenna array diagnosis allows a significant reduction of measurement time, which is crucial for the characterization of electrically large active antenna arrays, e.g. used in synthetic aperture radar. However, practical implementation of this method is limited by two factors: first, it is sensitive to thermal instabilities of the array under test, and second, excitation reconstruction accuracy strongly depends on the accuracy of the ele

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22

O'Donnell, M., and S. W. Flax. "Phase Aberration Measurements in Medical Ultrasound: Human Studies." Ultrasonic Imaging 10, no. 1 (1988): 1–11. http://dx.doi.org/10.1177/016173468801000101.

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Using a modified real-time phased array sector scanner, phase aberrations and amplitude fluctuations across the imaging aperture have been measured in a number of human subjects. Data from these subjects were classified into two categories based on the quality of conventional longitudinal images of the liver. Measured phase aberrations were very small in all subjects exhibiting high quality images. In contrast, large phase aberrations were measured in subjects producing low quality images. However, there were no significant amplitude variations across the array for all subjects studied. These

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23

Fatemi, Reza, Behrooz Abiri, Aroutin Khachaturian, and Ali Hajimiri. "High sensitivity active flat optics optical phased array receiver with a two-dimensional aperture." Optics Express 26, no. 23 (2018): 29983. http://dx.doi.org/10.1364/oe.26.029983.

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Xiang, Meng, Yu Xiao, Bin Xi, Yue Zhang, and Shiyou Xu. "Design of an S-Band Phased Array with Modified Dipoles." International Journal of Antennas and Propagation 2021 (November 29, 2021): 1–8. http://dx.doi.org/10.1155/2021/3306011.

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A wideband, low cross-polarization, high-gain, and wide-angle scanning antenna array is presented in this paper. The antenna array contains 8 subarrays in the horizontal dimension, and each subarray contains 4 unit cells. A two-side printed dipole with an amendatory equivalent circuit model is adopted, and the metal vias are introduced in the element design to ameliorate the cross-polarization level. A radome, acting as the wide-angle impedance matching layer, is introduced to achieve wide-angle scanning. A prototype of a 4 × 8 array is fabricated and measured. The results show that the operat

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Lay, Vera, Franziska Baensch, Sergej Johann, et al. "SealWasteSafe: materials technology, monitoring techniques, and quality assurance for safe sealing structures in underground repositories." Safety of Nuclear Waste Disposal 1 (November 10, 2021): 127–28. http://dx.doi.org/10.5194/sand-1-127-2021.

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Abstract. Within the project SealWasteSafe, we advance construction materials and monitoring concepts of sealing structures applied for underground disposal of nuclear or toxic waste. As these engineered barriers have high demands concerning integrity, an innovative alkali-activated material (AAM) is improved and tested on various laboratory scales. This AAM has low reaction kinetics related to a preferential slow release of the heat of reaction in comparison to alternative salt concretes based on Portland cement or magnesium oxychloride cements. Hence, crack formation due to thermally induced

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26

Oppermann, Martin, Joerg Schroth, and Felix Thurow. "Transmit/Receive (T/R) Modules – Key Elements for Phased Array Antennas." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2013, CICMT (2013): 000054–58. http://dx.doi.org/10.4071/cicmt-2013-tp24.

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Modern Active Electronically Steered Antennas (AESA) are operating in different platforms and systems. Inside EADS/CASSIDIAN the focus on X-Band antennas today is in airborne and fighter nose radars, in satellite based SAR antennas (Synthetic Aperture Radar) for earth observation and ground surveillance and security radars. Active antennas are assembled with hundreds or even thousands of T/R modules. This paper will describe an example of a so called standardized module solution based on LTCC package technology. State-of-the-art modules are assembled with active components like MMICs realized

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Oppermann, Martin, Joerg Schroth, and Felix Thurow. "Transmit/Receive (T/R) Modules—Key Elements for Phased Array Antennas." Journal of Microelectronics and Electronic Packaging 10, no. 3 (2013): 116–19. http://dx.doi.org/10.4071/imaps.381.

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Modern active electronically steered antennas (AESA) operate in different platforms and systems. Inside EADS/CASSIDIAN, the focus on X-band antennas today is on airborne and fighter nose radars, in satellite based SAR antennas (synthetic aperture radar) for earth observation, and ground surveillance and security radars. Active antennas are assembled with hundreds or even thousands of transmit/receive modules. This paper will describe an example of a so-called standardized module solution based on LTCC package technology. State-of-the-art modules are assembled with active components such as MMI

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28

Makhoul, Eduardo, Antoni Broquetas, Francisco Lopez-Dekker, Josep Closa, and Paula Saameno. "Evaluation of the Internal Calibration Methodologies for Spaceborne Synthetic Aperture Radars with Active Phased Array Antennas." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 5, no. 3 (2012): 909–18. http://dx.doi.org/10.1109/jstars.2012.2199087.

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29

Yanchun, Zheng, Miao Cunjian, Hong Lixiang, and Guo Weican. "An Experimental Study on Phased Array Ultrasonic Testing for Internal Inspection of Gas Storage Wells." Materials Evaluation 80, no. 8 (2022): 40–45. http://dx.doi.org/10.32548/2022.me-04278.

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A reduction in wall thickness, caused by corrosion, of the inner and outer surfaces of underground compressed natural gas storage wells is one of the main causes of failure. Therefore, taking wall thickness measurements is an important task during periodic inspection. This study proposes a corrosion detection technique based on the well’s shape using cylindrical convex ultrasonic phased array and develops a cylindrical convex phased array probe with 512 elements. Using an example well of ∅177 × 10.36 mm, the influences of process parameters such as active aperture, focal length, gain, and gate

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30

Xu, Zheng, Chengxiang Hao, Kuiwen Xu, and Shichang Chen. "A Compact Ku-Band Active Electronically Steerable Antenna with Low-Cost 3D T/R Module." Wireless Communications and Mobile Computing 2019 (April 22, 2019): 1–8. http://dx.doi.org/10.1155/2019/5287679.

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This paper presents a novel compact Ku-band active electronically steerable antenna array design with a low-cost and integrated T/R 3D module employed for airborne synthetic aperture radar (SAR) systems. The entire system adopts 3D multilayer technology with vertical interconnection to construct the hermetically packaging RF modules. By assembling different multifunctional modules into a whole multilayer board, the 3D T/R technique greatly improves the system integration and reduces implementation cost and size. Besides, a wideband circular polarized antenna array was designed in LTCC and conn

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31

Bachmann, Markus, Marco Schwerdt, and Benjamin Bräutigam. "Accurate Antenna Pattern Modeling for Phased Array Antennas in SAR Applications—Demonstration on TerraSAR-X." International Journal of Antennas and Propagation 2009 (2009): 1–9. http://dx.doi.org/10.1155/2009/492505.

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The high flexibility and tight accuracy requirements of today's spaceborne synthetic aperture radar (SAR) systems require innovative technologies to calibrate and process the SAR images. To perform accurate pattern correction during SAR processing, an Antenna Model is used to derive the multitude of different antenna beams generated by active antenna steering. The application of such an Antenna Model could be successfully demonstrated for the TerraSAR-X mission, launched in 2007. The methodology and the results of the inorbit verification with an achieved accuracy of better than dB is reviewed

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Parshina, E. S. "Technique for spatial interference reduction and its application in monopulse radar with active phased array antenna." Issues of radio electronics, no. 12 (February 3, 2021): 17–22. http://dx.doi.org/10.21778/2218-5453-2020-12-17-22.

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The paper describes monopulse radar with sidelobe-blanking system. The antenna of the sidelobe-blanking system is one subarray of the radar’s active phased array antenna. The elements of the subarray is also used for sum and difference pattern generation. It is shown that if aperture distribution required to produce low-sidelobe sum pattern is used, the pattern of one subarray will satisfy the requrements for antenna of the sidelobe-blanking system. An example of designing the monopulse radar with sidelobe-blanking system is presented. Sum pattern of the radar anettena is produced with differe

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33

Renkwitz, Toralf, Carsten Schult, and Ralph Latteck. "VHF antenna pattern characterization by the observation of meteor head echoes." Atmospheric Measurement Techniques 10, no. 2 (2017): 527–35. http://dx.doi.org/10.5194/amt-10-527-2017.

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Abstract. The Middle Atmosphere Alomar Radar System (MAARSY) with its active phased array antenna is designed and used for studies of phenomena in the mesosphere and lower atmosphere. The flexible beam forming and steering combined with a large aperture array allows for observations with a high temporal and angular resolution. For both the analysis of the radar data and the configuration of experiments, the actual radiation pattern needs to be known. For that purpose, various simulations as well as passive and active experiments have been conducted. Here, results of meteor head echo observatio

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34

Levy, Benzion, Ely Levine, and Yosef Pinhasi. "Super Directional Antenna—3D Phased Array Antenna Based on Directional Elements." Electronics 11, no. 14 (2022): 2233. http://dx.doi.org/10.3390/electronics11142233.

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This paper describes an antenna design approach for achieving super directivity in an AESA (Active Electronic Scanned Array) radar using an unconventional 3D phased array (PA) antenna concept based on directional Yagi–Uda elements. The proposed scheme is shown to have a wider scanning feature, with higher directivity in comparison to the same geometry dipole array without increasing the element number. The antenna’s microwave design includes an antipodal Yagi–Uda antenna element that is implemented efficiently on a microstrip PCB using a balun (balance–unbalance)-fed network. This type of ante

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35

Tong, San-Qiang, Bing-Zhong Wang, and Ren Wang. "A tightly coupled dipole array used for radiation power improvement on finite radiation aperture." Acta Physica Sinica 70, no. 20 (2021): 204101. http://dx.doi.org/10.7498/aps.70.20210309.

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Radiation power of an electromagnetic wave plays a decisive role in its transmission distance. Traditionally, the radiation power can be improved by expanding the radiation aperture size of the antenna array or increasing input power of the unit cell. However, the radiation aperture size is always restricted by assembly space. The input power improvement of the unit cell is always limited by the signal source. It is difficult to improve radiation power on a finite radiation aperture. However, the radiation power on a finite radiation aperture is related closely to the number of antenna element

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36

Lee, Jae-Duk. "Study on Active Return Loss of Phase Encoding Code Using Extended Coupling Matrix for Active Phased Array Synthetic Aperture Radar Application." Journal of Korean Institute of Information Technology 17, no. 5 (2019): 57–64. http://dx.doi.org/10.14801/jkiit.2019.17.5.57.

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Ye, Yuan, Shaozhi Wang, Boyuan Liu, et al. "Novel Planar Ultra-Wideband Modular Antenna Array with Low Profile." Electronics 11, no. 24 (2022): 4173. http://dx.doi.org/10.3390/electronics11244173.

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A planar ultra-wideband modular antenna array with an ultra-low profile based on a tight coupling effect is proposed. The antenna array is composed of multi-layer printed circuit boards. Since its frequency operation can extend up to the grading lobe frequency, the number of T/R components for the antenna aperture is reduced to the greatest extent. Specifically, a horizontal “fin” structure is added on the parallel feeding lines, which assists in improving the impedance matching of the array. In order to break the bandwidth limitation of the low-frequency loop mode, a capacitive short-circuit

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Lemaitre, Gerard Rene, Pascal Vola, Patrick Lanzoni, Silvio Mazzanti, Frederic J. Dérie, and Frederic Y. Gonté. "Active Optics—Advances of Cycloid-like Variable Curvature Mirrors for the VLTI Array." Photonics 9, no. 2 (2022): 66. http://dx.doi.org/10.3390/photonics9020066.

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Elasticity theory and active optics led us to the discovery of three geometrical configurations of variable curvature mirrors (VCMs) that are either cycloid-like or tulip-like thickness distributions. Cycloid-like VCMs are generated by a uniform load—air pressure—applied over the mirror rear surface, and reacts without any bending moment along its circular contour. This particular VCM configuration is of practical interest because it smoothly generates accurate optical curvatures, varying from plane at rest to spherical curvatures up to f/2.9 over 16-mm aperture under 6.5-bar air pressure. Sta

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Ambrozinski, Lukasz, Tadeusz Stepinski, Tadeusz Uhl, Janusz Ochonski, and Andrzej Klepka. "Development of Lamb Waves-Based SHM Systems." Key Engineering Materials 518 (July 2012): 87–94. http://dx.doi.org/10.4028/www.scientific.net/kem.518.87.

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Guided waves (GW) based methods are a promising tool for structural health monitoring (SHM) of plate-like metallic and composite structures in which high safety standards are required. In this paper we present research with the aim to design and manufacture a prototype of Lamb waves (LW) SHM system. Two approaches can be applied for SHM of plate-like structures. One of them can be based on a sparse array and damage imaging involving incoherent summation of signals envelope. The second approach involves phased arrays with transducers spaced at a distance lower than half wavelength of the excite

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Li, Lei, Kuan Yang, Xiaoyu Bian, Qinghui Liu, Yizhuo Yang, and Fengying Ma. "A Gas Leakage Localization Method Based on a Virtual Ultrasonic Sensor Array." Sensors 19, no. 14 (2019): 3152. http://dx.doi.org/10.3390/s19143152.

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In traditional sensory array-based acoustic emission methods that are used for gas leakage localization, the localization resolution depends on the spatial aperture of the array, that is, the number of sensors. Most of the existing methods use small arrays that can only achieve low-resolution localization results because of limitations such as the amplitude and phase consistency, the complexity and cost of the system. This paper reports the first application of a virtual phased array for gas leakage detection to obtain high-resolution localization results. This method uses a virtual linear ult

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Pankov, V. V., and D. S. Pomerantsev. "ULTRASOUND TESTING WITH USING OF THE PHASED ARRAY PROBES. BASIC PRINCIPLES. PART 1." Kontrol'. Diagnostika, no. 261 (March 2020): 38–43. http://dx.doi.org/10.14489/td.2020.03.pp.038-043.

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This article discusses the current state of standardization in the Russian Federation in the field of application of ultrasonic testing using a phased array. Attention is drawn to the problem of the lack of national standards (especially terminological), which clearly hinders the active development and implementation of the PA UT method in practice. The basic principles of the classical technology of phased arrays are analyzed. Electronic linear scanning, electronic scanning and combined scanning. Combined scanning has several advantages: a high probability of detecting defects, high scanning

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Sung, Jin-Bong, Se-Young Kim, Jong-Hwan Lee, and Byeong-Tae Jeon. "Development and Performance Compensation of the Extremely Stable Transceiver System for High Resolution Wideband Active Phased Array Synthetic Aperture Radar." Journal of Korean Institute of Electromagnetic Engineering and Science 21, no. 6 (2010): 573–82. http://dx.doi.org/10.5515/kjkiees.2010.21.6.573.

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Zhang, Haiyan, Yaqun Liu, Guopeng Fan, Hui Zhang, Wenfa Zhu, and Qi Zhu. "Sparse-TFM Imaging of Lamb Waves for the Near-Distance Defects in Plate-Like Structures." Metals 9, no. 5 (2019): 503. http://dx.doi.org/10.3390/met9050503.

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The ultrasonic phased array total focusing method (TFM) has the advantages of high imaging resolution and high sensitivity to small defects. However, it has a long imaging time and cannot realize near-distance defect imaging, which limits its application for industrial detection. A sparse-TFM algorithm is adopted in this work to solve the problem regarding rapid imaging of near- distance defects in thin plates. Green’s function is reconstructed through the cross-correlation of the diffuse full matrix captured by the ultrasonic phased array. The reconstructed full matrix recovers near-distance

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Останков, А. В., А. С. Нечаев, and С. Ю. Дашян. "SYNTHESIS OF PHASED ARRAY ANTENNA WITH FLAT-TOPPED DIRECTIONAL PATTERN." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 3 (July 2, 2021): 78–84. http://dx.doi.org/10.36622/vstu.2021.17.3.011.

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При синтезе фазированной антенной решетки с секторной диаграммой направленности методами, основанными на разложении диаграммы в обобщенный ряд Фурье, затруднительно обеспечить заданные показатели качества направленности. Причинами ухудшения показателей секторной диаграммы являются конечное число используемых при синтезе базисных функций и ограниченность в пространстве амплитудно-фазового распределения на апертуре решетки. Цель работы - показать на примере линейной эквидистантной антенной решетки, что применение при синтезе оптимизированного шаблона оригинальной формы позволяет достичь улучшенн

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Rusov, Yu S., and S. S. Krapivina. "Research of the Possibilities of Matching the Multi-element Receiving-Transmitting Irradiator Aperture." Radio Engineering, no. 1 (May 30, 2021): 1–13. http://dx.doi.org/10.36027/rdeng.0121.0000168.

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Currently, aperture antennas with spatial excitation, such as reflector antennas and phased array antennas, are widely used in radar. The composition of such an antenna includes an irradiator, which can be made in the form of a small-element array of radiators to form a set of necessary radiation patterns. Monopulse irradiators are often used, which form both total and difference directional patterns. When performing an irradiator based on waveguide parts, radiators in the form of horns or open ends of waveguides are installed in its aperture. Waveguide irradiators with four and twelve horns a

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Wang, Yan, Xiaoyue Zhang, Xing Yang, et al. "A Novel Swept-Back Fishnet-Embedded Microchannel Topology." Micromachines 14, no. 9 (2023): 1705. http://dx.doi.org/10.3390/mi14091705.

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High in reliability, multi in function, and strong in tracking and detecting, active phased array antennas have been widely applied in radar systems. Heat dissipation is a major technological barrier preventing the realization of next-generation high-performance phased array antennas. As a result of the advancement of miniaturization and the integration of microelectronics technology, the study and development of embedded direct cooling or heat dissipation has significantly enhanced the heat dissipation effect. In this paper, a novel swept-back fishnet-embedded microchannel topology (SBFEMCT)

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Lan, Tian, Qiu-Cui Li, Yu-Shen Dou, and Xun-Ya Jiang. "A Study of a Wide-Angle Scanning Phased Array Based on a High-Impedance Surface Ground Plane." International Journal of Antennas and Propagation 2019 (January 20, 2019): 1–10. http://dx.doi.org/10.1155/2019/8143104.

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This paper presents a two-dimensional infinite dipole array system with a mushroom-like high-impedance surface (HIS) ground plane with wide-angle scanning capability in the E-plane. The unit cell of the proposed antenna array consists of a dipole antenna and a four-by-four HIS ground. The simulation results show that the proposed antenna array can achieve a wide scanning angle of up to 65° in the E-plane with an excellent impedance match and a small S11. Floquet mode analysis is utilized to analyze the active impedance and the reflection coefficient. Good agreement is obtained between the theo

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Li, Bing, Zemin Wang, Jiachun An, et al. "Ionospheric Phase Compensation for InSAR Measurements Based on the Faraday Rotation Inversion Method." Sensors 20, no. 23 (2020): 6877. http://dx.doi.org/10.3390/s20236877.

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The ionospheric error can significantly affect the synthetic aperture radar (SAR) signals, particularly in the case of L band and lower frequency SAR systems. The ionospheric distortions are mixed with terrain and ground deformation signals, lowering the precision of the interferometric measurements. Moreover, it is often difficult to detect the small-scale ionospheric structure due to its rapid changes and may have more influence on ionospheric phase compensation for InSAR measurements. In this paper, we present a Faraday rotation (FR) inversion method and corresponding procedure to compensat

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Moroz, A. V., V. V. Davydov, K. Yu Malanin, A. A. Krasnov, and V. Yu Rud’. "Features of the construction of the noise compensation circuit of a small-sized active phased antenna array." Journal of Physics: Conference Series 1400 (November 2019): 044009. http://dx.doi.org/10.1088/1742-6596/1400/4/044009.

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Efimov, A. G., S. A. Korneev, V. S. Matveev, and V. V. Chistyukhin. "Designing Multi Beam Receiving and Transmitting Aperture LEO Space Communication Systems." Proceedings of Universities. Electronics 26, no. 1 (2021): 64–73. http://dx.doi.org/10.24151/1561-5405-2021-26-1-64-73.

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In designing the receiving-transmitting active phased antenna array (APAA) an important problem is an achievement of the level of maximum outcome between the receiving and transmitting channels. In the work, the concept of building multi-beam receiving-transmitting antenna systems based on APAA has been considered. The criteria for selecting the type of emitter for an S-band antenna with the specified parameters have been presented. It has been shown that the use of a turnstile emitter based on the printing technology can reduce the complexity of manufacturing without compromising the technica

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