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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 authors presented a high-isolation, low cross-polarization dualpolarized patch antenna for multifunction phased array radar applications, where the vertical and horizontal polarizations are excited by a balanced-probe feed and a slot-coupled feed, respectively.
Abstract: This paper presents a high-isolation, low cross-polarization dual-polarized patch antenna for multifunction phased array radar applications. Its hybrid feed design has been implemented, and the vertical and horizontal polarizations are excited by a balanced-probe feed and a slot-coupled feed, respectively. Simulations and measurements have demonstrated an input isolation of 45 and 43 dB between the horizontal and vertical ports, respectively. For further improvement in the cross-polarization level, the image feed method is also implemented, and a $2\times 2$ -element array made up of designed elements with image configuration has been fabricated. The simulated and measured S-parameter and radiation patterns of the horizontal and vertical polarizations of the designed $2\times 2$ -element array are presented and the measured cross-polarization level of less than −37 dB is achieved. To examine the performance of the designed element in an array, a $3\times 3$ -element array of designed $2\times 2$ -element subarray is fabricated and tested. In the $6\times 6$ -element measurements, −35.4 and −36 dB cross-polarization levels for horizontal and vertical polarizations are achieved, respectively. Also, using the measured embedded element patterns, the cross-polarization level lower than −36 dB for scan angles up to 45° is achieved.

57 citations

Journal ArticleDOI
TL;DR: In this article, the in situ beampattern of the MWA antenna tile relative to that of the reference antenna is measured using power ratio measurements, which cancels the variation of satellite flux or polarization with time.
Abstract: Detection of the fluctuations in a 21 cm line emission from neutral hydrogen during the Epoch of Reionization in thousand hour integrations poses stringent requirements on calibration and image quality, both of which necessitate accurate primary beam models. The Murchison Widefield Array (MWA) uses phased-array antenna elements which maximize collecting area at the cost of complexity. To quantify their performance, we have developed a novel beam measurement system using the 137 MHz ORBCOMM satellite constellation and a reference dipole antenna. Using power ratio measurements, we measure the in situ beampattern of the MWA antenna tile relative to that of the reference antenna, canceling the variation of satellite flux or polarization with time. We employ angular averaging to mitigate multipath effects (ground scattering) and assess environmental systematics with a null experiment in which the MWA tile is replaced with a second-reference dipole. We achieve beam measurements over 30 dB dynamic range in beam sensitivity over a large field of view (65% of the visible sky), far wider and deeper than drift scans through astronomical sources allow. We verify an analytic model of the MWA tile at this frequency within a few percent statistical scatter within the full width at half maximum. Toward the edges of the main lobe and in the sidelobes, we measure tens of percent systematic deviations. We compare these errors with those expected from known beamforming errors.

57 citations

Journal ArticleDOI
TL;DR: In this paper, a wide-scan angle planar patch phased array is proposed, which consists of wideband probe-fed microstrip patches placed above individual ground planes and interlaced with parasitic decoupling walls.
Abstract: In this paper, a wide-scan angle planar patch phased array is proposed. The proposed array is composed of wideband probe-fed microstrip patches placed $0.087\lambda _{h} (\lambda _{h}$ is the wavelength of highest frequency) above individual ground planes and interlaced with parasitic decoupling walls. In order to cancel the feed probe inductance, the array elements comprise additional degrees of freedom to introduce controllable capacitance. Concurrently, individual ground planes and parasitic decoupling walls are proposed as an effective structure to considerably increase the E-plane scanning angle of the phased array by reducing the magnitude of near-field mutual coupling. A 544-element phased array prototype of the proposed element was designed, manufactured, and validated experimentally. The experimental results agree well with the numerical simulation ones and indicate effectiveness of the proposed design for mutual coupling reduction and wide-angle scanning. Because of the modifications, the measured mutual coupling between adjacent elements is reduced to lower than −32 dB at the center frequency. The proposed phased array has almost a constant active input impedance (active VSWR less than 2 over 20% bandwidth) up to scan angle of 65° in E-plane and 60° in H-plane, with a realized gain reduction of about 3.5 dB.

57 citations

Proceedings ArticleDOI
TL;DR: In this paper, the authors demonstrate successful beam control of a fiber optic phased array containing a large number of polarization maintaining fibers using individual all-fiber phase modulators with a residual phase error less than 1/30th of a wave.
Abstract: We demonstrate, for the first time to our knowledge, successful beam control of a fiber optic phased array containing a large number of polarization maintaining fibers. As many as forty-eight fibers have been coherently combined via individual all-fiber phase modulators. The residual phase error is less than 1/30th of a wave. Results with both near-field interferometric control and target-in-the-loop control have been obtained. Experimental results are compared with numerical simulations and excellent agreement has been achieved. We investigated propagation of this phased array output through a turbulent atmosphere, and used the all-fiber phase modulators for the compensation of turbulence effects on the array output. This work paves the way towards scaling such fiber optic phased arrays to very high fiber count. Eventually thousand of fibers can be controlled via such a scheme.

57 citations

Journal ArticleDOI
Wonbin Hong1, Alexander Goudelev1, Kwang-Hyun Baek1, Vladimir Arkhipenkov1, Juhyung Lee1 
TL;DR: In this article, an integrated multilayer antenna-in-package (AiP) targeted for stationary 60 GHz communication is presented, which consists of a 4 × 6 array of 24 stacked circular patch antennas and corresponding antenna feed lines designed for phased array.
Abstract: An integrated multilayer antenna-in-package (AiP) targeted for stationary 60-GHz communication is presented. The key differences in design conditions for mass-market-level and prototype-level AiP are discussed and reflected during the design process. Hence, a low-cost and high-reliability package solution is realized. The proposed AiP consists of a 4 × 6 array of 24 stacked circular patch antennas and corresponding antenna feed lines designed for phased array. The finalized LTCC AiP prototype features 20 × 15 × 1.02 mm3 in dimension. Solder bump flip-chip technology is used to attach the AiP to the RFIC for system-level assembly. The assembled package is evaluated using a custom-designed near-field measurement setup. EM simulations and measurements confirm the presented AiP features more than 9 GHz bandwidth, 45° beam-steering ranges in both E- and H-planes, and more than 14.5 dBi gain at boresight.

57 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