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CST – Computer Simulation Technology

Title:
Wideband Radar Cross Section Reduction of Slot Antennas Arrays
Author(s):
Simone Genovesi, Filippo Costa, Agostino Monorchio
Source:
IEEE Transactions on Antennas and Propagation
Vol./Issue/Date:
Volume: 62, Issue: 1, January 2014
Year:
2014
Page(s):
163 - 173
Keywords:
Frequency selective surface (FSS), periodic resistive surface (PRS), radar absorbingmaterials (RAMs), radar cross section reduction (RCSR), slot antennas array
Abstract:
A comprehensive analysis aimed at reducing the radar cross section (RCS) of array antennas, preserving at the same time their radiating performance, is presented. A microstrip slot array is considered as a test case to illustrate the proposed strategy for radar cross section reduction (RCSR). It is shown that a remarkable reduction of the radar signature can be accomplished over a frequency band as wide as two octaves by employing an array of periodic resistive elements in front of the radiating apertures. The monostatic and bistatic RCS of the proposed structures are investigated both for normal and oblique incidence. Different arrangements and geometries of the periodic resistive pattern are thoroughly analyzed showing the benefits and the drawbacks in terms of antenna gain and level of the scattered fields. Furthermore, the use of metallic parasitic elements for enhancing the antenna gain is considered, and the scattering phenomena caused by their presence are addressed, taking into account the appearance of grating lobes. The antenna designs are also analyzed by resorting to a bidimensional color plot presenting the variation of the reradiated field both in frequency and spatial domain. The guidelines illustrated by the proposed examples can be easily applied to other antenna architectures.
Document:

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