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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.


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Patent
31 Mar 2014
TL;DR: In this paper, an optical phased array (OPA) is used for the solid state steering of laser beams using Photonic Integrated Circuits (PIC) for the generation of arbitrary radiation patterns as needed in 3D holography, optical memory, mode matching for optical space division multiplexing, free space communications, and biomedical sciences.
Abstract: A lidar-based apparatus and method are used for the solid state steering of laser beams using Photonic Integrated Circuits. Integrated optic design and fabrication micro- and nanotechnologies are used for the production of chip-scale optical splitters that distribute an optical signal from a laser essentially uniformly to an array of pixels, said pixels comprising tunable optical delay lines and optical antennas. Said antennas achieve out-of-plane coupling of light. As the delay lines of said antenna-containing pixels in said array are tuned, each antenna emits light of a specific phase to form a desired far-field radiation pattern through interference of these emissions. Said array serves the function of solid state optical phased array. By incorporating a large number of antennas, high-resolution far-field patterns can be achieved by an optical phased array, supporting the radiation pattern beam forming and steering needed in solid state lidar, as well as the generation of arbitrary radiation patterns as needed in three-dimensional holography, optical memory, mode matching for optical space-division multiplexing, free space communications, and biomedical sciences. Whereas imaging from an array is conventionally transmitted through the intensity of the pixels, the optical phased array allows imaging through the control of the optical phase of pixels that receive coherent light waves from a single source.

60 citations

Journal ArticleDOI
TL;DR: In this article, the performance of a broad-band monolithic SiGe monolithic microwave integrated circuits (MMICs) suitable for phased-array radar applications is reported, based on an optimized SiGe p-i-n diode offered by IBM 5HP SiGe foundry process.
Abstract: This paper reports the performances of several broad-band monolithic SiGe monolithic microwave integrated circuits (MMICs) suitable for phased-array radar applications. The amplitude and phase control MMIC designs are based on an optimized SiGe p-i-n diode offered by the IBM 5HP SiGe foundry process. Utilizing this diode, several control circuitries including a broad-band (1-20-GHz) monolithic single-pole double-throw switch, a five-port transfer switch, a 6-bit phase shifter, and a 5-bit attenuator, all operating over 7-11 GHz, are designed. Also, the design and performance of an SiGe heterojunction bipolar transistor variable-gain cascode amplifier that combines the functionality of an amplifier and an attenuator into one MMIC is described.

60 citations

Journal ArticleDOI
TL;DR: The application of phased array beamforming techniques was applied to acoustic data measured by two circular microphone arrays that were mounted in the intake and in the bypass of a Rolls-Royce fan rig for a better understanding of the source mechanisms of fan broadband noise.
Abstract: Fan broadband noise is a major component of the total noise emitted by turbofan engines, especially at lower shaft speeds. It is generated in the rotor/stator region, but the exact origin is not always known. This article discusses the application of phased array beamforming techniques for a better understanding of the source mechanisms of fan broadband noise. The Conventional Beamforming technique was applied, as well as the deconvolution technique CLEAN-SC and the beamforming technique ROSI for rotating sources. Beamforming was applied to acoustic data measured by two circular microphone arrays that were mounted in the intake and in the bypass of a Rolls-Royce fan rig. These arrays are normally used for the detection of azimuthal modes. The merits of beamforming are discussed by considering a number of typical low shaft speed cases. Using the intake array, in one of the cases forward radiating broadband noise sources were found that were coherent over a large area. These could have been due to a rotor i...

60 citations

Journal ArticleDOI
TL;DR: Full-aperture (six-beam) diffraction-limited results for the unresolved source Gama Orionis, the well-known close binary Capella, and the resolved red supergiant Betelgeuse are presented as preliminary demonstration of the potential capabilities of this configuration.
Abstract: By adjusting the optical path lengths of its individual beams, it is possible to make the multiple mirror telescope (MMT) into a phased array with a 6.86-m base line. A coherent phased focus can be achieved with tilted focal planes if the tilt angle is chosen so that the internal phase differences exactly compensate the external phase differences. This amounts to a slight change in configuration so that the beams are brought together at f/8.39 rather than the originally designed f/9. We summarize experiments which have used the MMT subapertures as a phased array and as a coherent phased telescope and present a simple analysis of the titled focal plane geometry for coherent observation. The phased operation of the MMT is important not only for obtaining high angular resolution but also for obtaining the higher detection sensitivity which results from the better discrimination against the sky emission background for IR diffraction-limited images. Full-aperture (six-beam) diffraction-limited results for the unresolved source Gama Orionis, the well-known close binary Capella, and the resolved red supergiant Betelgeuse (including a diffraction-limited differential speckle image of the latter) are presented as preliminary demonstration of the potential capabilities of this configuration.

60 citations

Patent
26 Dec 1973
TL;DR: In this paper, a function generator is connected to an airborne phased array radar antenna for steering a beam between high and low positions, and the generator blanks short range target signals.
Abstract: A function generator is connected to an airborne phased array radar antenna for steering a beam between high and low positions. During receiving on the high beam, the generator blanks long range target signals. During the low beam, the generator blanks short range target signals. A receiver is connected to the output of the antenna and a display is connected to the receiver output. By sequentially switching between low and high beams, with the described blanking, short and long range targets are displayed simultaneously, relatively free of ground clutter.

60 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