In-band RCS reduction antennas using an EBG surface

Abstract

The paper has proposed a multilayer, polarization rotation featured, low radar cross-section (RCS) antenna using electromagnetic band-gap (EBG)-based frequency selective surface (FSS) at 8.25 GHz. Cross-shaped EBG unit cells offer zero reflection phase and −25 dB reflection magnitude at 8.25 GHz. The FSS layer consists of eight cross-shaped EBG unit cells sandwiched between two substrates to offer high absorptivity at the desired band. The circular patch antenna resonating at 8.25 GHz is placed on the top substrate having a lower dielectric constant. Four circular-shaped patches are etched at the four corners of the top layer and are coupled with two feed lines which are aligned 90° to each other at the bottom layer and interconnected diagonally to achieve polarization rotation. The proposed antenna offers a gain of 6.72 dB and an in-band RCS of −21.4 dBsm. Incident energy is backscattered into eight directions separated by angle ϕ = 45°. The proposed antenna has the RCS reduction band of 7.7–9.4 GHz. It offers normalized polarization rotation ratio more than 0.8 within the −40° to 40° angular region at the frequency band 8–8.5 GHz. The measured result using the fabricated prototype agrees well with the simulated one.

Bistatic RCS Control on Slot-sinuous Antenna by Adding 3 and 5 Parasitic Ellipses Openings

“…Many different approaches have been presented for RCS reductions such as frequency selective surfaces (FSS) [8][9][10], metasurfaces [11][12][13][14], partially reflecting surfaces [15], electromagnetic bang gap (EBG) structures [16], and artificial magnetic conductor [17,18]. Different authors have presented parasitic stubs or slots openings in the antenna structure or in the antenna ground plane to control in band RCS [19][20][21][22][23].…”

Classification of scattering parameters of body-embedded wideband textile antennas for early diagnosis and monitoring of breast cancer

“…[20] Parsha et al . [21] show high-gain artificial magnetic conductor- and electromagnetic band-gap-based antennas for onbody communication purposes.…”