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Reflective array antenna

About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.


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Journal ArticleDOI
TL;DR: In this article, an ultrawideband, tightly coupled dipole array (TCDA) was proposed to support multiple satellite communication bands, simultaneously such antennas enable weight reduction by replacing multiple antennas and provide spectral efficiency by reusing intermediate frequencies for inter-satellite communication.
Abstract: In space-borne applications, reduction of size, weight, and power can be critical Pursuant to this goal, we present an ultrawideband, tightly coupled dipole array (TCDA) capable of supporting numerous satellite communication bands, simultaneously Such antennas enable weight reduction by replacing multiple antennas In addition, it provides spectral efficiency by reusing intermediate frequencies for inter-satellite communication For ease of fabrication, the array is initially designed for operation across the UHF, L, S, and lower-C bands (06–36 GHz), with emphasis on dual-linear polarization, and wide-angle scanning The array achieves a minimum 6:1 bandwidth for VSWR less than 18, 24, and 31 for 0°, 45°, and 60° scans, respectively The presented design represents the first practical realization of dual polarizations using a TCDA topology This is accomplished through a dual-offset, split unit cell with minimized inter-feed coupling Array simulations are verified with measured results of an ${\bf{8}}\times {\bf{8}}$ prototype, exhibiting very low cross polarization and near-theoretical gain across the band Further, we present a TCDA design operating across the upper-S, C, X, and Ku bands (3–18 GHz) The array achieves this 6:1 bandwidth for VSWR $ at broadside, and VSWR $ at 45° A discussion on design and fabrication for low-cost arrays operating at these frequencies is included

101 citations

Journal ArticleDOI
01 Apr 1948
TL;DR: In this paper, a simple derivation of the radiation resistance of a flat array of half-wave dipoles is presented. But this derivation assumes that each dipole is covered by a plane reflector at a quarter-wave distance.
Abstract: The electromagnetic field in front of an infinite flat array of antennas can be subdivided into wave channels, each including one of the antennas. Each channel behaves like a hypothetical waveguide similar to a transmission line made of two conductors in the form of parallel strips. A simple derivation then leads to the radiation resistance of each antenna and to some limitations on the antenna spacing. In the usual flat array of half-wave dipoles, each allotted a half-wave-square area, and backed by a plane reflector at a quarter-wave distance, the radiation resistance of each dipole is 480/π = 153 ohms. In a finite array, this derivation is a fair approximation for all antennas except those too close to the edge. This derivation also verifies the known formula for the directive gain of a large flat array in terms of its area. The same viewpoint leads to the radiation resistance of an antenna in a rectangular waveguide, which has previously been derived by more complicated methods.

100 citations

Journal ArticleDOI
TL;DR: In this paper, a highly isolated compact four-element planar ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna array configuration is presented.
Abstract: This letter presents a highly isolated compact four-element planar ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna array configuration. The main advantages of the proposed array configuration are that it requires no isolation/decoupling circuit and the configuration is easily extendable to larger size array. The array consists of novel miniaturized slotted annular ring monopole antenna and each element in the array is placed orthogonal to its adjacent elements. The fabricated structure provides good impedance bandwidth matching and high isolation between elements over the range from 3 to 15 GHz. The absence of decoupling circuit results in overall compact size of the proposed design. The prototypes are fabricated and tested. The simulated and measured results are in good agreement. Moreover, the envelope correlation coefficient and channel capacity loss of the array are calculated, which shows good MIMO performance. The proposed monopole antenna structure supports multielement UWB MIMO antenna array design with easy extension of elements and without any decoupling circuit. An example of eight-element array is also investigated.

100 citations

Journal ArticleDOI
TL;DR: It is shown that, using multifrequency antenna array SAR, not only the clutters can be suppressed but also the locations of both slow and fast moving targets can be accurately estimated.
Abstract: In this correspondence, we generalize the linear antenna array synthetic aperture radar (SAR) from transmitting single-wavelength signals to transmitting multiple-wavelength signals (called multifrequency antenna array SAR). We show that, using multifrequency antenna array SAR, not only the clutters can be suppressed but also the locations of both slow and fast moving targets can be accurately estimated: A robust Chinese remainder theorem (CRT) is developed and used for the location estimation of fast and slowly moving targets. Simulations of SAR imaging of ground moving targets are presented to show the effectiveness of the multifrequency antenna array SAR imaging algorithm.

99 citations

Journal ArticleDOI
TL;DR: In this paper, a miniaturized single-feed multiband patch antennas are proposed for wireless communication. But the antenna size reduction is achieved by loading shorting metalized vias on one edge of the radiating patch, while multiband is obtained by etching inverted multiple U-shapes.
Abstract: This communication introduces an approach for designing miniaturized single-feed multiband patch antennas. The size reduction is obtained by loading shorting metalized vias on one edge of the radiating patch, while multiband is obtained by etching inverted multiple U-shapes. A dual-band antenna with a large measured frequency ratio of 2.74 is first discussed. Then triple-band, and further quad-band antennas are, respectively, designed. The antennas have sufficient electrical small size when considering the radius of the minimum enclosing sphere to the radiating patch. A radius value of 0.09λ 0 is obtained for the quad-band antenna with respect to the lowest operating frequency centered at 3.04 GHz. Simulated and measured results of the antennas' reflection coefficient and radiation patterns are provided. Good agreement between the simulation results and measurement results is achieved. The antennas' measured peak gains and efficiencies vary from 1.43 to 3.06 dBi and 42% to 74%, respectively. Compared with other designs, the proposed antennas exhibit multiband performance by using a simple single-feed structure, realize different combinations of highly isolated frequency bands with wide tunability of frequency ratios, and have directional stable radiation patterns that are compact and of electrically small size. Indeed, they have the potential to meet the practical requirements for wireless applications.

99 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20238
202222
20211
20209
20199
201816