The sixth-generation (6G) communication technology is being developed in full swing and expected to be faster better than the fifth generation. precise information transfer directivity concentration of signal strength are key topics 6G technology. We report synthetic phase design rotary doublet Airy beam triplet Gaussian varifocal meta-devices fully control terahertz beam's propagation direction coverage area. focusing spot can delivered arbitrary positions a two-dimensional plane or...

Metasurfaces have promising potential to revolutionize a variety of photonic and electronic device technologies. However, metasurfaces that can simultaneously independently control all electromagnetics (EM) waves' properties, including amplitude, phase, frequency, polarization, momentum, with high integrability programmability, are challenging not been successfully attempted. Here, we propose demonstrate microwave universal metasurface antenna (UMA) capable dynamically, simultaneously,...

In this paper, a novel 3-D printed circularly polarized (CP) modified Fresnel lens antenna operating at 300 GHz is introduced. By virtue of the superior geometric flexibility printing technique, consisting subwavelength discrete dielectric posts in odd-numbered zones proposed. It further demonstrated that by integrating anisotropic metamaterial, can realize CP radiation fed simple linearly (LP) open-ended waveguide (OEWG). The approach also investigated to push performance envelops printer...

A high-gain circularly polarized (CP) lens antenna fed by a standard linearly (LP) pyramidal horn operating at 300 GHz is proposed in this letter. The CP consists of discrete variable-height dielectric posts and grating. height each post tuned to realize the required transmission phase, forming planar wavefront above aperture. By integrating bottom grating with anisotropic characteristic, can transform incident LP waves from feed source into radiation waves. Three-dimensional (3-D) printing...

Terahertz (THz) lens constitutes a vital component in the THz system. Metasurfaces-based metalenses and classical bulky lenses are severely constrained by chromatic/ spherical aberration diffraction limit. Consequently, achromatic super-resolution urgently needed. In this study, through translating required phase distribution into refractive index (RI) profile with specific thickness, an innovative approach to designing is proposed achieved dielectric gradient metamaterials. The samples...

High-gain millimeter-wave antennas based on spoof surface plasmon polaritons (SPPs) are proposed in this article. Since the dispersion of SPP modes supported by metallic grooves is insensitive to their lateral width, we propose two with wide grooves, namely an tapering rod antenna and leaky-wave antenna. The widened enlarge aperture size antennas, enhancing gains. Both fed a standard waveguide fabricated 3-D printing metallization. Based similar principle conventional dielectric achieves...

This article presents a novel design of filtering reflectarray antenna, an integrated module for the combination and high-gain radiation performance. The consists two-section metal pixel waveguide elements, which can realize optimized aperture reflection phase distributions in operating band f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> ≤ xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> to yield radiation. Below lower cutoff...

Conventional vortex beams carrying orbital angular momentum (OAM) suffer from the limitation of beam divergence in wireless communications applications. This article proposes novel 3-dimensional (3-D) printed discrete dielectric lenses (DDLs) for generation nondiffractive OAM operating at 300 GHz. By virtue its arbitrary aperture phase control capability, a terahertz (THz) DDL combining functionalities three conventional bulky refractive hyperbolic, spiral plane, and aixcon is proposed to...

In this article, a holograph-inspired flat lens antenna capable of simultaneously transmitting two independent coaxially propagating orbital angular momentum (OAM) beams operating at 60 GHz is proposed. the design, holographic theory including processes recording and reconstruction are developed to obtain desired compensation phase distribution lens. Novel wideband <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

This study formulates a volumetric inverse-design methodology to generate pair of complementary focusing metalenses for terahertz imaging: the two lenses exhibit equal and opposite shifts in focal length with frequency. An asymmetry arises, where we find that decreases frequency be more challenging achieve (without material dispersion) given fabrication constraints, but it is still possible. We employ topology optimization, coupled manufacturing explore fully freeform designs compatible 3D...

Abstract A novel method is proposed to achieve a multifunctional full‐space metalens supporting high power efficiency, broadband operation and large design flexibility for four spin‐controlled output channels. meta‐atom comprising an ultra‐thin printed circuit board layer low‐cost 3D‐printed dielectric block are introduced. This combines the geometric propagation phase phenomena divide incident circularly‐polarized wave into equi‐powered channels (left‐ right‐polarized reflected waves left‐...

A novel three-dimensional printed discrete dielectric lens (DDL) antenna with orbital angular momentum (OAM) mode reconfigurability operating at 300 GHz is proposed in this article. The consists of a stationary lower DDL and an upper in-plane rotatable DDL, fed by pyramidal horn. pair can transform the quasi-Gaussian beam from feed source into vortex waves, its OAM number, l, be dynamically reconfigured among 0, ±1, ±2 simple mechanical rotation panel specific angles relative to one. For...

In this article, a wideband, ultralow-profile circularly polarized (CP) folded transmitarray antenna (FTA) is proposed for millimeter wave (MMW) applications. The comprises receiver and transmitter (R/T) metasurface above waveguide-integrated metal plate reflector. By controlling the orientations of R/T elements, can simultaneously independently manipulate its reflection transmission electromagnetic (EM) wavefronts under opposite-handed CP incidences. mode metasurface, together with bottom...

Holography has garnered an explosion of interest in tremendous applications, owing to its capability storing amplitude and phase light reconstructing the full-wave information targets. Spatial modulators, metalenses, metasurfaces, other devices have been explored achieve holographic images. However, required distributions for conventional holograms are generally calculated using Gerchberg-Saxton algorithm, iteration is time-consuming without Fourier transform or acceleration techniques. Few...

This article proposes a novel nondiffractive Bessel beam launcher based on discrete dielectric lens (DDL) antenna with 2-D beam-scanning capability operating at 300 GHz. The terahertz (THz) consists of two identical in-plane rotatable DDLs fed by commercially available pyramid horn. First, the thin and lightweight can transform quasi-Gaussian spherical phase front from feed horn into well-collimated confined pseudo-Bessel beam. Second, we demonstrate that simultaneous rotation DLLs in same...

The incoming 5G and beyond wireless communications provide unprecedented ultra-high-speed transmission data rates. This is enabled by driving the carrier frequency up to millimeter-wave (mmWave) terahertz (THz) bands developing advanced multiplexing technology increase spectrum bandwidth spectral efficiency. In this article, we present novel discrete lens antenna designs solve two leading open challenges of orbital angular momentum (OAM) applications in mmWave THz bands: OAM diffractive...

Three-dimensional (3-D) printing, also known as additive manufacturing, provides a novel and cost-effective approach for implementing microwave devices. With the rapid advancement improved manufacturing resolution of 3-D printing technology, has enabled design fabrication electronic devices in higher terahertz (THz) frequency bands, contributing to bridging gap between microwaves photonics. Simultaneously, metalenses have garnered significant attention due their ability shape electromagnetic...

Borrowing the idea of amplitude modulation from classical communications theory, this article proposes and demonstrates a new concept amplitude-modulated (AM) leaky-wave antennas. In proposed concept, traveling wave in wave-guiding structure serves as carrier whose is spatially modulated by predefined modulating waveform to generate desired waves. Two analysis methods are subsequently developed analyze effects. It demonstrated that spatial corresponds shifting spectrum up frequency....

This work introduces a new design of Fabry–Perot cavity (FPC) antenna with great filtering response based on novel feeding scheme. Unlike the traditional method adopting frequency selective surfaces to achieve characteristic, proposed strategy focuses source. We can obtain an excellent by utilizing performance-improved act as source FPC antenna. To validate concept, we first propose substrate-integrated-waveguide-fed (SIW-fed) element working in 60-GHz band. By using slotted radiating...

Bessel beam steering operating at the terahertz (THz) band holds great potential in improving depth-of-field (DOF) for imaging systems and quality of short-range high-speed communications. This article reports a THz reflective metasurface frequency-controlled beams steering. A multiresonance structure with large reflection phase range is designed as fundamental element by varying its dimensions. At designated frequency, desired distribution to generate an off-axis determined four terms,...

Inspired by the well-known power/energy leakage phenomenon between an unshielded grounded coplanar waveguide (GCPW) and its neighboring parallel-plate (PPW), a class of simple, low-cost, planar leaky-wave antennas (LWAs) exhibiting wideband fixed-beam radiation tailorable directional angle are systematically investigated developed for millimeter-wave applications. The capability providing (desired) inflexibility altering beam's (undesired) first studied revealed concerning uniform GCPW LWA....

A wideband circularly polarized patch antenna is proposed.The wide impedance and axial ratio bandwidths are achieved by the proposed feeding mechanism, which entails use of a circular microstrip line coupling through four Γ-shaped slots to generate sequentially phased sources excite single layer antenna.The can provide an SWR bandwidth over 16.5% (for < 1.5) axial-ratio 13.3% AR 3 dB).The performance has been confirmed both measurement simulation.The gain enhanced backlobe radiation reduced...

A novel wideband millimeter-wave antenna with low cross polarization based on spoof surface plasmon polaritons (SPPs) is proposed in this letter. Periodic metallic grooves operate as an SPP transmission line high electromagnetic field confinement. The concept of dielectric tapered rod employed to design linear-tapered groove depth, converting the confined energy radiation mode. Meanwhile, structure only affects E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A deep-learning enabled discrete dielectric lens (DDL) antenna with terahertz hologram reconfigurability is proposed. The constructed by two cascaded lenses, which are designed based on a diffractive deep neural network (D <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> NN) an improved loss function, fed static horn. DDL can achieve dynamic holographic imaging simple mechanical translation of the perfect electric conductor (PEC) mask...