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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17 Jun 2012TL;DR: In this paper, a 16-element phased array receiver with built-in-self test (BIST) is demonstrated at 76-84 GHz, where a miniature capacitive coupler located at the input port of each phased-array channel is used to measure the amplitude and phase of each channel.
Abstract: A 16-element phased array receiver with built-in-self test (BIST) is demonstrated at 76–84 GHz. The BIST technique employs a miniature capacitive coupler located at the input port of each phased-array channel, and uses the receiver I/Q down-converter to measure the amplitude and phase of each channel. This allows for measuring the response of individual channels if one channel is turned on at a time, and an on-chip array factor if several channels are turned on and the phase between them is varied. BIST measurements done at 76–84 GHz agree very well with S-parameter measurements with a matched load and an open circuit load at each port, and show that this technique can be used to greatly lower the testing cost and improve the self-calibration of mm-wave phased-array RFICs.
77 citations
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22 Oct 1998TL;DR: In this article, a radio communication system includes a base station having a directional antenna for generating a plurality of beams, which are used to receive signals which are decoded at the base station.
Abstract: A radio communication system includes a base station having a directional antenna for generating a plurality of beams. A first set of the beams is used to receive signals which are decoded at the base station. A second set of the beams is used for interrogating a cell to identify beams which should be added to the first set of beams (for example, in response to mobile terminals entering the cell). In one embodiment, the second set of beams comprises a plurality of searcher beams produced by a fixed-beam phased array antenna. In a second embodiment, the second set of beams comprises a single searcher beam which is scanned through the cell by an adaptive phased array antenna. The radio communication system can be used to communicate with indoor mobile terminals through a plurality of radio heads, and also can be used to communicate with orbiting satellites.
77 citations
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TL;DR: In this paper, a more practical alternative for designing UWB tightly coupled phased arrays is proposed, which employs uniform excitation of the central array elements and short-circuits the periphery elements to provide up to 3 dB more gain and 50% higher efficiency than typical resistive termination.
Abstract: Tightly coupled phased arrays (TCPAs) provide UWB performance due to their strong inter-element coupling. However, in finite tightly coupled phased array realizations, mutual coupling is reduced near the array edges, causing the edge elements to become narrowband. To address this issue, a nonuniform array excitation scheme, referred to as “characteristic mode (CM) excitation,” was recently proposed. A more practical alternative for designing UWB tightly coupled phased arrays is proposed here. In this paper, we present a strategy that employs uniform excitation of the central array elements and short-circuits the periphery elements. We report that at least for medium size arrays, this approach provides up to 3 dB more gain and 50% higher efficiency than typical resistive termination. This concept is demonstrated using a 7 × 7 linearly polarized dipole array, 60.96 cm × 60.96 cm (2' × 2') in size, for operation from 200 MHz-600 MHz. Feeding of the active elements is challenging due to several constraints on the feed design, including balanced to unbalanced transitions, impedance transformations, common mode suppression, compact size, low cost, etc. To address these issues we propose a novel array feed using a compact, ultrawideband balun (with 10:1 bandwidth for VSWR ). Simulated and measured data are provided for broadside and 30 scan in the H-plane.
77 citations
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TL;DR: A phased array ultrasonic inspection (PAULI) system was developed to obtain electronically scanned ultrasonic images of the inside of nuclear power plant components for nondestructive evaluation.
77 citations
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TL;DR: It is shown that, without loss of transmitter efficiency, a high effective impedance may be created in series with each coil in the array by the use of Cartesian negative feedback, which is viable for signal reception and more efficacious than pre-amplifier damping, albeit over a smaller bandwidth.
77 citations