Topic
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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Papers
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13 May 2018TL;DR: In this article, the authors demonstrate the highest yet reported element count actively-steered optical phased array with record low array power consumption of <1.8W, using a 70 × 14 degree field of view while pumped by an integrated InP/silicon laser.
Abstract: We demonstrate the highest yet-reported element count actively-steered optical phased array with record low array power consumption of <1.8W. We show 2D steering over a 70 × 14 degree field of view while pumped by an integrated InP/silicon laser.
54 citations
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TL;DR: In this article, boundary element formulation is employed to approximate the acoustic radiation force and torque applied to a rigid body by discretizing the body surface, which is an explicit function of the transducer's phase and amplitude.
Abstract: In previous studies, acoustical levitation in the far-field was limited to particles. Here, this paper proposes the “boundary hologram method,” a numerical design technique to generate a static and stable levitation field for macroscopic non-spherical rigid bodies larger than the sound wavelength λ. This paper employs boundary element formulation to approximate the acoustic radiation force and torque applied to a rigid body by discretizing the body surface, which is an explicit function of the transducer's phase and amplitude. Then, the drive of the phased array is numerically optimized to yield an appropriate field that stabilizes the body's position and rotation. In experiments, this paper demonstrates the levitation in air of an expanded polystyrene sphere with a diameter of 3.5 λ and a regular octahedron with diagonal length of 5.9 λ, both located 24 λ from the acoustic elements, by a 40 kHz (λ = 8.5 mm) ultrasonic phased array. This method expands the variety of objects that can be levitated in the far-field of an ultrasonic phased array.
54 citations
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TL;DR: To reduce hardware requirements and the bandwidth required for digital processings, this paper describes an efficient method to generate the sampling clocks for dynamic focusing and steering and some modified bandwidth sampling techniques to reduce the sampling rate for signal digitization.
53 citations
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15 Oct 2018TL;DR: LiSteer, a novel system that steers mmWave beams at mobile devices by repurposing indicator LEDs on wireless Access Points to passively acquire direction estimates using off-the-shelf light sensors, maintains beam alignment at the narrowest beamwidth level even in case of device mobility.
Abstract: We present LiSteer, a novel system that steers mmWave beams at mobile devices by repurposing indicator LEDs on wireless Access Points (APs) to passively acquire direction estimates using off-the-shelf light sensors. We demonstrate that LiSteer maintains beam alignment at the narrowest beamwidth level even in case of device mobility, without incurring any training overhead at mobile devices. Our extensive evaluation on a custom dual-band hardware platform comprising highly directional horn antennas as well as practical phased antenna arrays with electronic beam steering shows that LiSteer achieves direction estimates within 2.5 degrees of ground truth on average. Moreover, it achieves beam steering accuracy of more than 97% while in tracking mode, without incurring any client beam training or feedback overhead.
53 citations
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TL;DR: In this article, a dual-band antenna apparatus with a plurality of first-phase antenna elements for low frequency and a plurality-of-second-phase array antennas for high frequency was presented.
Abstract: In a dual band array antenna apparatus having a plurality of first phased array antenna elements for a low frequency and a plurality of second phased array antenna elements for a high frequency, one transceiver module is provided for a number of the phased array first antenna elements, and microstrip lines of the first phased array antenna elements are changed to obtain a desired phase distribution at the first phased array antenna elements Also, one transceiver module is provided for each of the second phased array antenna elements
53 citations