In this paper, a checkerboard metasurface based on novel physical mechanism, optimized multielement phase cancellation, is proposed for greatly expanding the bandwidth of radar cross section (RCS) reduction. More basic metaparticles and, in particular, variable difference between them, increase ability to control electromagnetic waves. Interactions multiple local waves produced by at frequencies sampled superwide frequency band are manipulated and simultaneously achieve cancellation. The can...

A dual-polarization frequency-selective rasorber (FSR) with two absorptive bands at both sides of a passband is presented. Based on the characteristic mode analysis, circuit analog absorber designed using lossy surface (FSS) that consists miniaturized meander lines and lumped resistors. The positions values resistors are determined according to analysis modal significances current. After that, presented by cascading FSS lossless bandpass FSS. Equivalent circuits FSR modeled, current...

The design and experiment of an electronically reconfigurable bidirectional spatially-fed array are presented, which combines the functionalities transmitarray (TA), reflectarray (RA), transmit-reflect (TRA). First, we demonstrate a novel unit cell composed tunable resonant layer between pair orthogonally oriented metal gratings. Two positive-intrinsic-negative (PIN) diodes integrated into to achieve 1-bit phase resolution in either transmission or reflection mode. Based on proposed cell, 16...

In this article, an ultrawideband radar scattering cross-sectional (RCS) reduction metasurface is proposed combining with absorption and phase cancellation mechanisms. A two-lossy-layer absorber designed first, which responsible for low-frequency RCS from 1.3 to 13 GHz (163.6%). The equivalent circuit of the extracted, proving that wideband characteristic due occurrence multiple resonant points. To further improve bandwidth, unit cells are arranged three different heights. consists 3...

Based on polarization conversion and destructive interference, a novel monolayered metasurface is proposed for ultrawideband monostatic bistatic radar cross section (RCS) reductions both copolarization polarization. Unit cells share simple asymmetric double arrow shape, but with variable geometry parameters, correspondingly different capabilities reflection coefficients. The particle swarm optimization (PSO) algorithm array theory are combined to optimize select appropriate parameters unit...

This letter presents an absorptive/transmissive frequency selective surface (ATFSS) with wide absorption bands at both sides of a passband. A double-layer structure consisting lossy FSS and lossless was employed. The FSSs were designed based on tripole loops slots, respectively. slots constructed as hexagonal periodic structure. equated to series-parallel circuit exhibited feature after they loaded lumped resistors, which used absorb the incident wave lower upper bands. Surface current...

In this article, the working mechanism of a wideband absorber designed with an adjustable and highly selective notch band is studied, in which narrow independently controlled by lower lossless layer absorber, whereas upper lossy loaded lumped resistors realizes absorption. We present two instances geometrically electrically bands, respectively. Without decreasing absorption performance, position can be flexibly adjusted throughout entire frequency simply modifying dimension...

Inspired by the recent progress of metasurfaces, a novel wideband and high-efficiency electronically reconfigurable transmitarray (TA) is presented that can enable two-dimensional (2-D) beam steering multiple mode switching in digital manner. The proposed unit cell consists anisotropic metallic resonator, which locates between pair orthogonally oriented subwavelength metal gratings. One-bit phase quantization obtained controlling ON or OFF state two positive-intrinsic-negative (p-i-n) diodes...

A quad-polarization reconfigurable reflectarray (RA) antenna, which can work in horizontal polarization (HP), vertical (VP), left-hand circular (LHCP), and right-hand (RHCP) modes with simultaneous large-angle beam-scanning capability, is designed experimentally verified. Under the traditional view at element level, least 2-bit phases are required because a 90° phase shift step needed for conversion from linear (LP) to (CP). In this work, we found that extra shifts (90°/ <inline-formula...

In this letter, a reconfigurable multifunctional polarization conversion metasurface is proposed. The state of the reflected wave controlled by changing PIN diodes, which are embedded in unit cells composed butterfly structure and biasing network. When diodes forward biased <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> -state, can regulate incident linearly polarized into its cross-polarized two bands 7.30–8.90 GHz 19.40–24.92...

This paper presents an active frequency selective surface (AFSS) with a wide reconfigurable passband. The tuning mechanism was investigated equivalent circuit which consists of parallel L-C resonant and series circuit. A cross-loop slot selected as unit cell, varactor diodes were added across the to tune effects various bias configurations on transmission coefficients studied. simulation results showed that passband ranged from 2.92 5.74 GHz obtained variable capacitance 0.8 0.1 pF....

In this letter, a single-layer bandpass frequency selective surface (FSS) working at 2.6 GHz is proposed to decrease the interference communication systems and cost of processing based on multimode resonator. A metasurface unit cell adopted suppress grating lobe achieve miniaturization. Therefore, performance FSS can remain stable under large oblique incidence. The current distribution equivalent circuit model each design step are extracted explain its principle. Good agreement between...

A coding diffusion metasurface is designed and fabricated for ultra‐wideband radar cross‐section (RCS) reduction. Two kinds of unit cells based on square ring patch are employed to generate the ‘0’ ‘1’ elements metasurface. By precise design cells, a 180° ± 37° reflection phase difference between these achieved over 8.01–22.76 GHz, leading dramatically reduce scattering field level by more than 10 dB. To obtain far‐field pattern metasurface, optimisation algorithm utilised calculate optimal...

An absorptive/transmissive frequency selective surface (ATFSS) with absorption bands at both sides of a passband is presented. Equivalent circuits the ATFSS that consists lossy (FSS) and lossless FSS were modeled. To improve rejection an undesired band, transmission zero was introduced controlled by loading four-legged loaded slots. The parasitic suppressed when cross structure in resistance. In order to expand dipoles utilized for design. wide realized after three ATFSSs different...

In this article, a rasorber with energy-selective passband and ultrawideband absorptive out-of-band is proposed, which combines the advantages of conventional frequency-selective absorber (FSA) surface (ESS). The proposed design consists an upper lossy layer lower active layer. By analyzing equivalent circuit model (ECM), could generate three transmission zeros, thereby achieving absorption independent incident power. embedded p-i-n diodes exhibits nonlinear response to intensity spatial...

Abstract In this paper, an ultra-wideband, wide angle and polarization-insensitive metasurface is designed, fabricated, characterized for suppressing the specular electromagnetic wave reflection or backward radar cross section (RCS). Square ring structure chosen as basic meta-atoms. A new physical mechanism based on size adjustment of meta-atoms proposed ultra-wideband manipulation (EM) waves. Based hybrid array pattern synthesis (APS) particle swarm optimization (PSO) algorithm, selection...

In this paper, a novel uneven-layered coding metamaterial tile is proposed for ultra-wideband radar cross section (RCS) reduction and diffuse scattering. The composed of two kinds square ring unit cells with different layer thickness. reflection phase difference 180° (±37°) between covers an ultra-wide frequency range. Due to the cancellation cells, has scattering pattern four strong lobes deviating from normal direction. its 90-degree rotation can be encoded as '0' '1' elements cover...

A prismatic conformal metasurface, based on optimized multielement phase cancellation, is proposed for wideband radar cross-sectional (RCS) reduction. The metasurface composed of 35 lattices located in seven zones a structure. different are simulated under corresponding incident angles and taken into account the difference wave path caused by bending interactions between multiple backscattered waves produced manipulated simultaneously hybrid array pattern synthesis particle swarm...

A dual-polarization frequency-selective structure with a tunable passband and two absorptive bands is presented. Based on an equivalent circuit model (ECM), the working principle investigated first. The values of components in ECM are derived from required performances mapped to initial design, which designed by cascading surface (FSS) realized dipole-like elements lossless bandpass FSS achieved square ring slot. For tuning passband, varactors biasing networks added into design. adding...

This article presents a low radar cross section (RCS) single-layer multifunctional shared aperture (MSA) with tunable manipulation of radiation and bistatic scattering patterns over the same wide frequency band. A low-cost positive-intrinsic-negative (p-i-n) diode is used in unit cell to evoke <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$180^{\circ } \pm 20^{\circ }$ </tex-math></inline-formula>...

Metasurfaces have received extensive attention for their unique electromagnetic properties. However, traditional metasurface design is hugely labor-intensive and computationally resource-intensive, especially when using complex structures to obtain suitable targets. In this article, a method based on deep learning (DL) proposed, which can efficiently reduce time resource consumption. The DL model composed of two parts, an autoencoder (AE) network (DLN). It quickly fit the relationship...

In this communication, a multi-functional phased array with polarization reconfiguration, beam scanning and monopulse functions is presented for advanced satellite applications based on 2-bit phase-shifting network planar comparator. The diodes embedded in the upper patch independently control modes of proposed array, including linear (LP), left-handed circular (LHCP) right-handed (RHCP). comparator located middle layer can switch flexibly sum difference patterns both azimuth elevation...