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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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Proceedings ArticleDOI
01 Jan 1958
TL;DR: In this article, the beam of a stationary two-dimensional antenna array can be scanned throughout a volume in space using an array of radiating waveguides fed by a unique arrangement which permits both independent phase control of every element and frequency scanning along one dimension of the array.
Abstract: By proper interelement phase control, the beam of a stationary two-dimensional antenna array can be scanned throughout a volume in space. This scanning is demonstrated with an array of radiating waveguides fed by a unique arrangement which permits both independent phase control of every element and frequency scanning along one dimension of the array. Volumetric scanning is achieved by various combinations of these phase-shifting schemes. The measured beam position corresponds very favorably with theory for any given phase distribution. The adverse sidelobes appearing in the measured radiation patterns correspond to systematic errors. Methods for suppressing these systematic errors are discussed in detail, and encouraging experimental results are reported.

25 citations

01 Jan 1993
TL;DR: In this paper, a beam space CMA (BSCMA) adaptive array antenna is proposed, in which multiple beams are formed in the multibeam former and those received signals whose received signals have sufficient level are selected.
Abstract: A constant modulus algorithm (CMA) adaptive array antenna is based on the fact that interference causes a constant modulus signal to undergo amplitude fluctuations. The authors proposed a beam space CMA (BSCMA) adaptive array antenna. In the BSCMA adaptive array, first, multiple beams are formed in the multibeam former. Next, those beams whose received signals have sufficient level are selected. The weights of only these selected beams are optimized in an adaptive loop. The BSCMA adaptive array antenna is useful in mobile satellite communications, because the number of interferences that need to be considered is smaller than the number of elements. >

25 citations

Journal ArticleDOI
TL;DR: An opinion of designing multi-port integrated UWB and NB antennas systems to overcome the drawbacks of reconfigurable antennas and to further enhance the spectrum utilization efficiency is discussed.
Abstract: In recent years, the demand for spectrum continues to increase with the advent of various wireless communication applications. However, it is a limited resource and cannot be made available beyond a certain extent. Many of the times, licensed spectrum is free due to its inefficient utilization. So, it can be utilized for other applications to mitigate the problem of limited spectrum availability to some extent. Among the many ways of performing this task, one approach is to use the frequencies in statically licensed spectrum through continuous sensing, which is popularly known as cognitive radio technology. In this model, UWB antennas are employed to monitor the radio environment and narrow band (NB) antennas are adopted for communication. This paper discusses various kinds of planar monopole antennas for cognitive radio applications. They are divided into three categories on the basis of different antennas used in cognitive radio environment. In the first category two separate antennas, which include one UWB antenna and one frequency reconfigurable NB antenna are employed for spectrum sensing and communication, respectively. In the second category, a single port frequency reconfigurable UWB/NB antenna is used. However, it requires an appropriate switching mechanism to switch between the UWB and NB modes. The third category includes dual-port integrated antennas systems, in which one UWB antenna and one frequency reconfigurable NB antenna are integrated on a single substrate. Finally, this paper discuss an opinion of designing multi-port integrated UWB and NB antennas systems to overcome the drawbacks of reconfigurable antennas and to further enhance the spectrum utilization efficiency.

25 citations

Journal ArticleDOI
TL;DR: In this article, an all-passive phased-array feed network based on composite right/left handed (CRLH) transmission lines (TLs) is proposed, which enables systematic engineering of the phase response providing phase advance and phase delay.
Abstract: This paper presents an all-passive phased-array feed network based on composite right/left handed (CRLH) transmission lines (TLs). A CRLH TL enables systematic engineering of the phase response providing phase advance in addition to phase delay. When utilized in a phased-array feed network, an all-passive 1-D frequency-scanning array can be designed with a large scanning angle range toward both positive and negative elevation angles. This unique feature cannot be realized using conventional delay lines or dispersive lines that do not contain left-handed properties. Also, unlike the previously studied CRLH-based leaky-wave antennas that provide similar 1-D continuous frequency-scanning functionality, the proposed method completely decouples the radiating antenna element from the array factor; thereby providing extra design freedom and enhanced radiation performance. To validate the added advantage, we use the proposed CRLH-based phased-array feed network to demonstrate simultaneous controllability of the radiated polarization and array current amplitude distribution.

25 citations

Proceedings ArticleDOI
01 Jan 2005
TL;DR: In this paper, the authors present design trade-offs of array architectures for hemispherical coverage and show that a spherical array geometry is the optimal choice for this application in terms of performance and cost.
Abstract: In this paper we present design trade-offs of array architectures for hemispherical coverage. We show that a spherical array geometry is the optimal choice for this application in terms of performance and cost. It is a natural array geometry that provides scan-independent hemispherical coverage with a uniform gain pattern. We also show that a spherical array requires fewer elements than a comparable multi-planar phased array with significantly larger instantaneous bandwidths, lower polarization and mismatch losses

25 citations


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