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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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01 Jan 1993
TL;DR: A general technique for the theoretical determination of the input impedances and the radiation patterns of stacked microstrip patch antennas of arbitrary shapes is presented and various cases of stacked rectangular and triangular patch antennas are investigated.
Abstract: Multi-band antennas have applications in radars and communication systems. For their light-weight low-cost properties, stacked microstrip patch antennas have recently gained increasing support as dual frequency antennas. The paper presents a general technique for the theoretical determination of the input impedances and the radiation patterns of stacked microstrip patch antennas of arbitrary shapes. It then investigates various cases of stacked rectangular and triangular patch antennas. For these antennas, some approximations are introduced in the modelling technique in order to make it efficient on personal computer. The investigations on the stacked rectangular patch antenna focus on antennas with dissimilar substrates, non-aligned patches or unequal patch sizes. The effects of some radomes on the characteristics of the stacked rectangular patch antennas are also included. As far as the stacked triangular patch antenna is concerned, its analysis is presented and its performance is compared against that of the rectangular counterpart. Some experimental results are also reported.

16 citations

Journal ArticleDOI
TL;DR: In this article, a compact, enclosed, ultrawide-band (UWB) antenna array is presented to acquire data for a quantitative microwave imaging method, which allows a UWB antenna to be placed close to a target object while, at the same time, minimizing the volume of the imaging array.
Abstract: A compact, enclosed, ultrawide-band (UWB) antenna array is presented to acquire data for a quantitative microwave imaging method. Compared to existing systems, the proposed array allows a UWB antenna to be placed close to a target object while, at the same time, minimizing the volume of the imaging array. The antennas and metallic enclosure are designed to easily integrate with an iterative threedimensional (3-D) nonlinear inverse scattering technique. The volume of the internal imaging domain has been minimized for this particular architecture to reduce the computational time spent on reconstructing the dielectrics within the domain. Each cavity-backed element radiates toward the target and presents stable transmission characteristics across the 1-4-GHz band.

16 citations

Patent
20 Jan 1972
TL;DR: In this article, an auxiliary signal is radiated through an omnidirectional antenna collocated with the phase center of an adaptive array antenna to form a probe or pilot beam with a notch in the main-beam direction.
Abstract: In a system for reducing sidelobes in adaptive receiving array antennas, an auxiliary signal is radiated through an omnidirectional antenna collocated with the phase center of an adaptive array antenna. The auxiliary signal is so transmited as to form a probe or pilot beam with a notch in the main-beam direction by transmitting through both the omnidirectional and the array antenna simultaneously. The relative phases of both antennas are controlled to obtain near-zero radiation in the main-beam direction. Adaptive control loops receive returns from the probe beam and adjust the weights of the receiving array antenna. The receiving array weights are used to form a low sidelobe antenna pattern for reception of the main radar signal, which is transmitted with a directional pattern. Either time or frequency separation may be used to distinguish the probe beam from the main beam.

16 citations

Proceedings ArticleDOI
07 May 1990
TL;DR: In this paper, the CNA-512 is introduced, which is a spatial array consisting of 512 statistically distributed microstrip antennas, working at X-band, with a look-direction-independent beamwidth of 2.7 degrees.
Abstract: The experimental radar system CNA-512 is introduced. Its core is a spatial array consisting of 512 statistically distributed microstrip antennas. The object is to demonstrate radar operation over 360 degrees without need for mechanical antenna rotation. The CNA-512, working at X-band, is designed for a look-direction-independent beamwidth of 2.7 degrees . The positions of the single elements (microstrip loop antennas) were determined via a 3D-Taylor density distribution. Each antenna element is to be equipped with a separate T/R-module, from which 60 have been realized in the first step. The array is subdivided into 32 subgroups with combination on the RF level; the individual signal outputs are down-mixed and digitized, allowing monopulse operation and adaptive null steering. Phase calibration for beamforming is achieved by the measurement of relative phases at a few reference elements inside the sphere. First experiments with the CNA-512 showed that transmit-receive operation and phase-steering work as projected. >

16 citations


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