Proceedings ArticleDOI
The square kilometer array (SKA) antenna
D.H. Schaubert,Anatoliy Boryssenko,A. van Ardenne,J. G. Bij de Vaate,Christophe Craeye +4 more
- pp 351-358
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TLDR
In this paper, the authors describe the radiating aperture design that is currently employed for the demonstration system, which utilizes wide bandwidth Vivaldi tapered slot antennas for the individual elements and is likely that the final array design will resemble this demonstration aperture.Abstract:
One of the major approaches to satisfying future goals for radio astronomy is a wide bandwidth receiving array that forms a radio telescope with one square kilometer of collecting area The array will operate over a decade of frequency, approximately 200 MHz to 2000 MHz, it will provide polarimetric information for at least 100 simultaneous beams, and it will form interferometric images with 01 arcsec angular resolution at 14 GHz Such an array will be comprised of approximately 10/sup 8/ wide bandwidth elements and will require calibration, digital beamforming, and adaptive nulling This paper describes the radiating aperture design that is currently employed for the demonstration system It is likely that the final array design will resemble this demonstration aperture, which utilizes wide bandwidth Vivaldi tapered slot antennas for the individual elements Design information and results for prototypes and the demonstrator are presentedread more
Citations
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Journal ArticleDOI
Scanning Performances of Wideband Connected Arrays in the Presence of a Backing Reflector
TL;DR: In this article, the authors compared the performance of connected arrays of dipoles and slots with respect to the properties of the corresponding Green's functions (GFs) and showed that connected arrays are better suited to scan to wide angles (45 degrees) while retaining the minimal number of transmit/receive modules.
Journal ArticleDOI
Wideband, Wide-Scan Planar Array of Connected Slots Loaded With Artificial Dielectric Superstrates
TL;DR: This work proposes a planar solution realized with a single multi-layer PCB, with consequent reduction in cost and complexity of the array, which consists of an array of connected slots backed by a metallic reflector and loaded with superstrates.
Journal ArticleDOI
Dynamic Analysis of a Macro–Micro Redundantly Actuated Parallel Manipulator
Hamid D. Taghirad,Meyer Nahon +1 more
TL;DR: In the closed-loop simulations using decentralized PD controllers at the macro and micro levels, it is shown that the macro-micro structure results in a 10 times more accurate positioning than that in the first stage of the macro–micro structure.
Journal ArticleDOI
Fast Pencil Beam Pattern Synthesis of Large Unequally Spaced Antenna Arrays
TL;DR: In this article, a fast pencil beam pattern synthesis method for large non-uniform antenna arrays is proposed based on an interpolation in a least square sense and iterative fast Fourier transform (FFT), i.e., interpolate the nonuniform distributed elements into uniform virtual elements, and then apply FFT to synthesis the uniform array.
Journal ArticleDOI
Benchmarking Ultrawideband Phased Antenna Arrays: Striving for Clearer and More Informative Reporting Practices
Rick W. Kindt,John T. Logan +1 more
TL;DR: Embedded element design and measurement data for an ultrawideband (UWB) flared-notch (Vivaldi) array is presented, tailored to highlight cross-polarization (cross-pol) performance in all scan planes, an important metric that should be tested during array radiator design.
References
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Journal ArticleDOI
Experimental results of 144-element dual-polarized endfire tapered-slot phased arrays
TL;DR: In this paper, the authors measured data for mutual coupling coefficients and scan-element patterns and examined element resonances, predicted by numerical infinite-array analysis, and found that the central elements are heavily affected by the finiteness of the arrays due to strong mutual coupling between array elements.
Journal ArticleDOI
An efficient MoM formulation for finite-by-infinite arrays of two-dimensional antennas arranged in a three-dimensional structure
TL;DR: In this article, an efficient method-of-moments (MoM) scheme for simulating finite-by-infinite arrays is presented. But it is not suitable for the case of strongly coupled antenna arrays, where the behavior of the elements near the edge can exhibit very large deviations from the infinite periodic array solution.
Journal ArticleDOI
A class of E-plane scan blindnesses in single-polarized arrays of tapered-slot antennas with a ground plane
TL;DR: In this paper, a simple model was proposed for predicting the existence and location of a class of E-plane scan blindnesses in single-polarized arrays of tapered-slot antennas.
Proceedings ArticleDOI
Two dimensional 256 element phased array system for radio astronomy
TL;DR: The first part of a phased array demonstrator known as the thousand element array (THEA) has been constructed, of which first system results are presented in this article, where the completed parts consist of four tiles of one square meter with RF-beamforming and a digital back-end with digital beamforming and correlation.