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Phased array

About: Phased array is a research topic. Over the lifetime, 19428 publications have been published within this topic receiving 229231 citations. The topic is also known as: Phased Array Radar, PAR.


Papers
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Journal ArticleDOI
TL;DR: In this article, the A0 Lamb wave mode has been chosen for the localization method and the arrays are placed in such a way that the angulardifference between them is 458 and the rotation point is the middle transducer, which is common for allthe arrays.
Abstract: A method for damage localization based on the phased array idea has been developed. Four arrays oftransducers are used to perform a beam-forming procedure. Each array consists of nine transducersplaced along a line, which are able to excite and register elastic waves. The A0 Lamb wave mode hasbeen chosen for the localization method. The arrays are placed in such a way that the angulardifference between them is 458 and the rotation point is the middle transducer, which is common for allthe arrays. The idea has been tested on a square aluminium plate modeled by the Spectral Element Method. Two types of damage were considered, namely distributed damage, which was modeled asstiffness reduction, and cracks, modeled as separation of nodes between selected spectral elements.The plate is excited by a wave packet. The whole array system is placed in the middle of the plate.Each linear phased array in the system acts independently and produces maps of a scanned fieldbased on the beam-forming procedure. These maps are made of time signals (transferred to spacedomain) that represent the difference between the damaged plate signals and those from the intactplate. An algorithm was developed to join all four maps. The final map is modified by proposed signal processing algorithm to indicate the damaged area of the plate more precisely. The problem fordamage localization was investigated and exemplary maps confirming the effectiveness of theproposed system were obtained. It was also shown that the response of the introduced configurationremoves the ambiguity of damage localization normally present when a linear phased array is utilized.The investigation is based exclusively on numerical data.

68 citations

Journal ArticleDOI
TL;DR: A survey of the methods of constructing phased-array antennas with optimum radiating structures that provide shaping of the flat-topped array-element patterns is given in this article, which corresponds to maximization of the array gain in a given limited scanning sector, using a corresponding minimum number of controlled elements.
Abstract: A survey is given of the methods of constructing phased-array antennas with optimum radiating structures that provide shaping of the flat-topped array-element patterns. This corresponds to maximization of the array gain in a given limited scanning sector, using a corresponding minimum number of controlled elements. The methods considered include the use of passive multiport networks, coupled dual-mode waveguides, protruding dielectric elements, corrugated structures, and quasi-optical networks that provide excitation of the necessary over-lapped subarrays.

68 citations

Journal ArticleDOI
TL;DR: In this article, the design, fabrication, and measurement of an ultra-wideband phased array antenna, with continuous coverage of all six allocated fifth generation and industrial, scientific, medical bands in the millimeter-wave spectrum, is presented.
Abstract: In this paper, we present the design, fabrication, and measurement of an ultra-wideband phased array antenna, with continuous coverage of all six allocated fifth generation and industrial, scientific, medical bands in the millimeter-wave spectrum. Of importance is that the complete array is co-fabricated as a single printed circuit board using commercial processes, implying a significant reduction in cost over previous microfabrication-based designs. The design is demonstrated in simulation to operate across 24–72 GHz with VSWR $3\times 3$ array prototype, which shows close agreement to the simulated values.

68 citations

Patent
19 Feb 1998
TL;DR: A phased array antenna as mentioned in this paper consists of a plurality of planar panels each having opposing sides and top and bottom edges and forming an antenna face, and each planar panel is disposed circumferentially about a central axis and is connected to adjacent panels along the sides thereof.
Abstract: A phased array antenna includes a plurality of planar panels each having opposing sides and top and bottom edges and forming an antenna face. Each planar panel is disposed circumferentially about a central axis and is connected to adjacent panels along the sides thereof. Each panel is inclined toward the central axis from the bottom edge. A plurality of antenna elements are positioned on each panel. Each panel includes substantially the same number of antenna elements as adjacent panels and forms an antenna array on each antenna face. A plurality of transmit/receive modules generates and receives signals, and each transmit/receive module corresponds to a respective antenna element on an antenna array. Means connects each of the transmit/receive modules to respective pluralities of the antenna elements within each array. A switch collectively controls the connection of the transmit/receive modules to respective antenna elements of one selected antenna array so that the transmit/receive modules are collectively connected to respective antenna elements of a selected antenna array at a selected time.

68 citations

Patent
12 Mar 1999
TL;DR: In this paper, an approach for self-contained calibration and failure detection in a phased array antenna having a beamforming network is presented. But it does not specify a switch section for sequentially coupling each one of the antenna elements.
Abstract: Apparatus and method for self-contained calibration and failure detection in a phased array antenna having a beamforming network. The beamforming network includes a plurality of array ports and a plurality of beam ports or a space fed system. A plurality of antenna elements and a plurality of transmit/receive modules are included. Each one of the modules is coupled between a corresponding one of the antenna elements and a corresponding one of the array ports. A calibration system is provided having: an RF input port; an RF detector port; an RF detector coupled to the RF detector port; and an antenna element port. A switch section is included for sequentially coupling each one of the antenna elements through the beam forming/space-fed network and the one of the transmit/receive modules coupled thereto selectively to either: (a) the detector port during a receive calibration mode; or, (b) to the RF input port during a transmit calibration mode. The switch section includes a switch for selectively coupling a predetermined one of the antenna elements, i.e., a calibration antenna element, selectively to either: (a) the RF test input of the calibration system during the receive calibration mode through a path isolated from the beamforming network; or, (b) to the detector port during the transmit calibration mode through a path isolated from the beamforming network. In one embodiment, the calibration antenna element is disposed in a peripheral region of the array of antenna elements. In another embodiment, the array of antenna elements is arranged in clusters, each one of the clusters having a calibration antenna element.

68 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023373
20221,052
2021661
2020979
20191,266
20181,066