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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.


Papers
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Proceedings ArticleDOI
01 Oct 2015
TL;DR: This paper presents thinning of a linear array that generates radiation patterns with reduced peak side lobe level (PSLL) and particle swarm optimization (PSO) technique is used to estimate the optimum combination of `on' and `off' elements corresponding to lowest possible peak SLL.
Abstract: This paper presents thinning of a linear array that generates radiation patterns with reduced peak side lobe level (PSLL). Uniform amplitude excitation across all the elements is assumed and particle swarm optimization (PSO) technique is used to estimate the optimum combination of ‘on’ and ‘off’ elements corresponding to lowest possible peak SLL. In order to assess and validate the performance of proposed method for thinning of a linear conventional array, an array consisting of 100 sources with a cos0 element pattern and uniform inter-element spacing of 0.5X is considered. Array performance is compared with the results obtained for the arrays in which all the elements are turned ‘on’ and with those of previously published results. The capability of proposed method is further demonstrated for thinning of linear phased array by assuming the array of 100 isotropic elements which is steered to 60° with respect to antenna boresight. The radiation pattern characteristics of the phased array for the specified scan angle is reported and compared with those obtained at antenna boresight.

20 citations

Proceedings ArticleDOI
S. Visuri1, Dirk Slock1
04 Aug 2002
TL;DR: This paper addresses the problem of designing the colocated antenna array response for two applications: diversity reception using maximum ratio combining and MIMO communication capacity, and evaluates the performance of two opposite extremes in terms of design: very selective beamspace type of operation versus spatially allpass antennas.
Abstract: We report on in this paper is motivated by the drive towards antenna array miniaturization: going from an array of identical antennas that get spread out in space towards an array of colocalized antennas with differing responses. We address the problem of designing the colocated antenna array response for two applications: diversity reception using maximum ratio combining and MIMO communication capacity. The design criteria are derived under specific models regarding the distribution of the parameters of the frequency flat channel. We are particularly interested in evaluating the performance of two opposite extremes in terms of design: very selective beamspace type of operation versus spatially allpass antennas. We also show that the pathwise channel model converges for large number of paths to the stochastic channel model with separable correlation between TX and RX sides.

20 citations

Proceedings ArticleDOI
11 Jul 2010
TL;DR: In this article, a revised expression for surface resistivity that better accounts for these effects at both low frequencies (100MHz) and high frequencies (10 GHz) is presented, addressing the challenges involved with patch antennas made from transparent materials for integration with solar cells.
Abstract: Satellites have always played an important role in space. Their contributions for space research, extended global communications and surveillance have been instrumental for the advancement of the information age. As part of the effort to create this outer space network, small satellites that in average weigh less than 5 Kg are becoming important players in space communications. Limitations of surface area on small satellites leave barely enough room for solar cells, which are necessary to power the internal systems of the satellite. This repeatedly impedes the placement of external elements such as antennas. Without the required surface area for topical microstrip patches, complex and failure prone antennas, such as deployable parabolic reflectors, are often used. This adds substantially to cost and labor hours as well as the potential for failure. Transparent and conductive materials such as ITO (Indium Tin Oxide) have been used in the developed of topical patch antennas [1], [2] that could potentially be mounted on top of solar cells. ITO has a high optical transparency (90%–80%) at very thin depositions (100nm-1.2um) while maintaining a considerably high conductivity of 281319 S/m. However, at very thin depositions efficiency of patch antennas is severely handicapped by skin and ground effects. This paper presents a revised expression for surface resistivity that better accounts for these effects at both low frequencies (100MHz) and high frequencies (10 GHz). Furthermore, this paper addresses the challenges involved with patch antennas made from transparent materials for integration with solar cells.

20 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a modification in a linear antenna array whereby the grating lobes are suppressed by up to 100% with an additional improvement in the directivity of main-lobe and reduction in other sidelobe levels.
Abstract: Antenna arrays with interelement spacing as integral multiple of wavelength λ have been absent in practical implementations despite their highly directive main lobe; the disuse is primarily attributed to the presence of grating lobes. This letter proposes a modification in a linear antenna array whereby the grating lobes are suppressed by up to 100% with an additional improvement in the directivity of main-lobe and reduction in other sidelobe levels. A new array factor is synthesized by replacing the individual elements in a linear array with a pair of elements called discrete dipole elements (DDEs); a background theory of spatial hard windowing is proposed for the synthesis of array factor. Array factors of linear array made of eight DDEs are compared to those of an eight-element linear isotropic array to validate the claims. The proposed DDE array is then fabricated using monopole antennas; a good agreement between measured, simulated, and analytical results is seen.

20 citations

Patent
03 Jun 1950

20 citations


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