Topic
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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TL;DR: This work demonstrates a practical DoA array composed of antennas with diverse radiation patterns which is combined with an algorithm which relies primarily on amplitude information rather than phase information, which yields a much smaller array with similar direction-finding capabilities to larger ones.
Abstract: Direction-of-arrival (DoA) estimation of incoming electromagnetic signals can play a critical role in surveillance, sensing, and cognitive radio applications. Typical DoA antenna arrays use an aperture measuring several wavelengths across to ensure reliable measurement of phase information. For a UHF application, such an array would need to be a few meters across-too large for a portable array. This work demonstrates a practical DoA array composed of antennas with diverse radiation patterns which is combined with an algorithm which relies primarily on amplitude information rather than phase information. This approach yields a much smaller array with similar direction-finding capabilities to larger ones. A calibration procedure captures the antenna responses, including the parasitic effects of the closely spaced antennas. The calibrated array and direction-finding algorithm then achieves measured accuracy with resolution of six degrees with no front-to-back or quadrant ambiguities.
19 citations
11 Jul 1999
TL;DR: Given the failure of one or more elements of an array antenna designed to produce a radiation pattern including nulls in arbitrarily fixed directions, a pattern with the desired side lobe level and nulls can often be recovered by modifying the excitations of the non-defective elements.
Abstract: Given the failure of one or more elements of an array antenna designed to produce a radiation pattern including nulls in arbitrarily fixed directions, a pattern with the desired side lobe level and nulls can often be recovered by modifying the excitations of the non-defective elements. The modified excitations can be calculated by simulated annealing using an appropriate cost function.
19 citations
TL;DR: In this paper, a curved array split into two subarrays is proposed to improve the pattern null depth and width for controlled reception pattern antenna (CRPA) systems, which consists of a single reference element at the center and two sub-arrays that are arranged on a spherical coverture.
Abstract: This communication proposes a curved array split into two subarrays to improve the pattern null depth and width for controlled reception pattern antenna (CRPA) systems The proposed array consists of a single reference element at the center and two subarrays that are arranged on a spherical coverture To consider both signal processing and electromagnetic (EM) perspectives, array patterns are calculated by using a microstrip patch antenna in conjunction with a constraint least-mean-square (LMS) algorithm The proposed array shows significant improvement in the pattern null depth and width compared to a uniformly distributed circular array
19 citations
TL;DR: In TDMA and CDMA communication systems, the adaptive array antenna fit to each system is shown and the nulls of an antenna radiation pattern are steered in the directions of interference signals.
Abstract: Digital beamforming (DBF) antennas are developing as advanced phased array antennas. The microwave signal received at each element antenna of the DBF array antenna is converted to a digital signal after downconversion. Beamforming is carried out in a digital processor, so both excitation amplitudes and phases can be controlled more precisely in the DBF than in the conventional phased array antenna. The DBF also has the advantage of adaptive array antenna signal processing. This allows the nulls of an antenna radiation pattern to be steered in the directions of interference signals. Adaptive array antennas are applied to the base station antennas of mobile communications. In this presentation, in TDMA and CDMA communication systems, the adaptive array antenna fit to each system is shown.
19 citations
07 Aug 2002
TL;DR: In this paper, Cohen et al. established a link between the interval of multi-band characteristics of dipole Koch curve antennas with the dimension of the underlying fractal geometry, and showed that fractal geometries have been studied for antennas with special characteristics, both as antenna elements, and as spatial distribution functions for elements in antenna arrays.
Abstract: Fractal geometries have been studied for antennas with special characteristics, both as antenna elements, and as spatial distribution functions for elements in antenna arrays Koch dipole and monopole antennas have been studied recently as smaller sized antennas, and their multi-band characteristics have been reported (see Cohen, N, IEEE Professional Program Proc of Electronics Industries Forum of New England, p43-9, 1997; Puente-Baliarda, C, IEEE Trans Antennas Propagat, vol48, p1773-81, 2000) We try to establish a link between the interval of multi-band characteristics of dipole Koch curve antennas with the dimension of the underlying fractal geometry
19 citations