A Reflectarray Based on the Folded Sir Patch-Slot Configuration Backed on FSS for Low RCS

Abstract

Abstract-In this letter, a reflectarray antenna based on the folded stepped impedance resonator (SIR) patch-slot configuration with variable size is presented. A novel frequency selective surface (FSS) in the reflectarray as a ground plane for reducing radar cross section (RCS) level is applied. The FSS is based on the folded SIR configuration. Two prime-focus 15×15 reflectarray antennas backed on the folded SIR FSS ground and a conventional ground are designed and manufactured. The radiation performance of a reflectarray element backed either by a solid ground plane or a band-stop FSS structure is compared. The measured results demonstrate that the radiation pattern and gain of the FSS-backed reflectarray are almost same to its counterpart backed by a conventional ground plane at the operating band of 11.5 GHz. The RCS is effectively reduced in the out of this band when compared with the reflectarray with a solid metal ground plane of the same dimension.

Ultra-Wideband Reflectarray Antenna Using Two Layers Square-Loop Frequency Selective Surfaces

“…Frequency Selective Surfaces are an array of resonant elements -referred to as unit cells -arranged periodically, thus, the entire periodic structure can be studied and designed by studying and designing the unit cell in terms of its shape, dimensions, and number of layers [5]. The FSS idea can be used to address the problem of the resonance behavior of the radiating elements, by either designing multi-layer unit cells which leads to obtaining a multi-resonant behavior of the radiating elements and thus increasing its bandwidth [6][7][8], choosing complex shapes of the single-layer unit cells which also leads to obtaining a multi-resonant behavior of the radiating elements [9][10][11][12][13], or designing sub-wavelength unit cells, hence, a resonant coupling is obtained between the near elements [14][15][16][17]. A number of solutions have been presented to address the problem of the path differences of the electromagnetic waves from the feed to the radiating elements such as using True Time Delay (TTD) technique which depends on adding transmission lines with different lengths to compensate the path differences [18][19][20], or using Multi-faceted configurations which depends on folding the reflectarray aperture to compensate the path differences [21].…”

A Novel Reflectarray Antenna with Reduced RCS

“…It is well known that the use of high gain antennas increases the RCS level on military applications (aircraft, ships and so on) and the platform detectability [5]. The numbers of studies to reduce RCS in the reflectarray antennas are limited in the literature.…”

“…In particular, the studies on RCS reduction of microstrip reflectarray antennas with FSS structure are both very narrow and only out-of-band. In the following works, RCS cannot be reduced in the operating band of reflectarray antenna [5], [11], [12]. In this study, it has been selected a new type FSS structure for the RCS reduction of reflectarray antenna.…”

Monte Carlo simulation for stochastic calculus of far‐field radiation from open‐ended waveguide arrays

“…A certain number of techniques have been introduced to achieve a more accurate analysis of large arrays such as open‐ended waveguide radiators . While conventional array theory with proper element excitation (array factor approach) is a classical approach for analysis of array antenna . In , a novel hybrid asymptotic moment of method has been presented for the analysis of nonuniformly excited large phased arrays of open‐ended waveguides.…”