High gain, low radar cross‐section, and left hand circularly polarized antenna array based on metamaterial inspired elements

Abstract

In this research work, a wideband metamaterial-inspired circularly polarized antenna array is designed. The designed antenna array has a low radar cross-section (RCS) but high gain. The basic element of the planar array is analyzed as a dual-band electromagnetic absorber. Under normal incidence, the designed basic element has two absorbing peaks at 3.6 and 11.2 GHz. Further, four elements of the 4 × 4 elements array are connected to the feeding network through metallic vias. The feeding network is designed on the bottom layer. The circular polarization is archived by feeding the cross shape metallic resonator at two feed points, in a manner that there is a 90 time phase difference between the fields of two. It is shown that a good axial ratio is obtained over a wideband. This design method simultaneously validates high gain antenna performance and also meets the conditions of low-RCS.

Broadband RCS reduction for both microstrip array and Fabry‐Perot antenna based on the quasi‐ AMC superstrate

“…The comparison results are represented in Table 1. It is found that the RCSR bandwidth of the proposed structure is higher than that of Zhang et al 13, 17, 18, 23 The FP antenna has a narrow bandwidth and the maximum relative bandwidth is 6.9% in Rahman et al, 7 while the maximum absolute bandwidth is 1.2 GHz in this article. For the array antenna, the transmission band depends on both the antenna and the transmission window of the FSS.…”

“…In recent years, metamaterials have been widely investigated and applied to solve many issues since it is characterized by special regulation to the EM waves 7 . The Artificial Magnetic Conductor (AMC), as a kind of metamaterial, has been also extensively studied and applied to the RCSR.…”

Research on in‐band stealth of antenna based on phase gradient metasurface

“…For the second type of scattering, there are many ways to realize RCSR, such as polarization conversion metamaterial (PCM), [6][7][8] frequency selective surface (FSS), 9,10 artificial magnetic conductor (AMC), [11][12][13] and PGM. [14][15][16][17][18] Considering the scattering problem of the antenna, at present, achieving the in-band RCSR of the antenna is an urgent problem to be solved.…”

A low RCS microstrip antenna based on a composite technology of slotting and loading split‐rings

“…With the increasing demand for conformal applications and the integration of antennas, strict requirements have been imposed on their size. Reducing the RCS of antennas while maintaining their radiative performance without increasing their size is a challenging task that, however, offers considerable rewards 16–18 . Many technologies developed to this end have limitations in terms of single use such that they cannot maintain the radiative characteristics of the antenna while reducing its RCS and maintaining its overall size 18,19 .…”

“…Reducing the RCS of antennas while maintaining their radiative performance without increasing their size is a challenging task that, however, offers considerable rewards. [16][17][18] Many technologies developed to this end have limitations in terms of single use such that they cannot maintain the radiative characteristics of the antenna while reducing its RCS and maintaining its overall size. 18,19 Therefore, it is worth exploring whether the RCS of the antenna can be further reduce through the use of composite technology.…”