The polarization conversion of electromagnetic (EM) waves, especially linear-to-circular (LTC) conversion, is great significance in practical applications. In this study, we propose an ultra-wideband high-efficiency reflective LTC converter based on a metasurface the terahertz regime. It consists periodic unit cells, each cell which formed by double split resonant square ring, dielectric layer, and fully gold mirror. frequency range 0.60 - 1.41 THz, magnitudes reflection coefficients reach...

The synchronization problem over the special orthogonal group SO(d) consists of estimating a set unknown rotations from noisy measurements subset their pairwise ratios ⁠. has found applications in computer vision, graphics and sensor network localization, among others. Its least squares solution can be approximated by either spectral relaxation or semidefinite programming followed rounding procedure, analogous to approximation algorithms Max-Cut. contribution this paper is three-fold: first,...

A 4 × L-probe patch antenna array using multilayer low temperature co-fired ceramic (LTCC) technology is presented for 60-GHz band applications. The proposed designed with a high gain in the impedance bandwidth by introducing novel soft-surface structure. structure comprised of metal strips and via fences reduces losses caused severe surface waves mutual coupling between adjacent elements to improve radiation performance. convenient integrated fabricated excluding measurement transition has...

A novel phase corrected substrate integrated waveguide (SIW) H-plane horn antenna with embedded metal-via arrays is presented. The SIW divided into four subhorns by three inside the horn. uniform distribution of EM field across aperture achieved adjusting lengths and positions arrays. proposed has a compact profile, its simulated gain 7.50 dBi at 35.5 GHz, whereas traditional without 6.38 dBi. When measured, 7.87 5.58 Good agreement between measured results obtained.

A millimeter-wave shaped-beam substrate integrated conformal array antenna is demonstrated in this paper. After discussing the influence of shape on characteristics a waveguide (SIW) and radiating slot, an mounted cylindrical surface with radius 20 mm, i.e., 2.3 λ, synthesized at center frequency 35 GHz. All components, including 1-to-8 divider, phase compensated network 8 × slot are fabricated single dielectric together. In measurement, it has - 27.4 dB sidelobe level (SLL) beam H-plane...

This communication proposes a dual-polarized end-fire phased array for 5G handset devices at 28 GHz. The proposed four-element has low profile of 1.1 mm, small clearance 2.7 and symmetric patterns in the vertical plane. element is fed by substrate-integrated waveguide (SIW), which works as (WG) antenna with vertically polarized radiation pattern. Two transition plates are introduced to improve impedance matching WG antenna. horizontal polarization generated exciting one an other plate...

In this paper, the use of a dispersive prism with triangular shape is proposed to reduce radiation nature leaky-wave antenna (LWA) in groove-gap waveguide technology. The operation gap technology based on metallic pins that act as an artificial magnetic conductor, so electromagnetic fields are confined and guided desired directions. To control these possible by tailoring height pins, its periodicity, width. This radiation, any conventional LWA, dispersive, leading beam squint frequency...

Hormone-activated proteolysis is a recurring theme of plant hormone signaling mechanisms. In strigolactone signaling, the enzyme receptor DWARF14 (D14) and an F-box protein, MORE AXILLARY GROWTH2 (MAX2), mark SUPPRESSOR OF MAX2 1-LIKE (SMXL) family proteins SMXL6, SMXL7, SMXL8 for rapid degradation. Removal these transcriptional corepressors initiates downstream growth responses. The homologous SMXL3, SMXL4, SMXL5, however, are resistant to MAX2-mediated We discovered that smxl4 smxl5 mutant...

This paper presents a terahertz (THz) transmitter (Tx) and receiver (Rx) chipset operating around 400 GHz in 0.13- μm SiGe BiCMOS technology. The Tx chip consists of voltage-controlled oscillator, buffer, modulator, power amplifier, frequency tripler, substrate integrated waveguide (SIW) antenna. antenna has an additional high-pass filtering characteristic to suppress the unwanted fundamental ( <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f</i>...

This communication introduces a modified substrate integrated waveguide (SIW), the gap SIW, and deduces an approximate closed-form expression for calculating its effective width, taking into account fringing coupling fields around gap. As immediate application, this new structure is used to correct phase distribution of H-plane SIW horn antenna. The achieved quasi-uniform results in greatly enhanced antenna gain without deteriorating bandwidth. To further improve both radiation impedance...

New communications systems require high-speed data transfer and need high frequency, wideband, directive antennas. Leaky-wave antennas are a desirable type of for millimeter submillimeter waves, since they can produce radiation with single feeding. The latter is an enormous advantage to reducing the cost losses at frequency. Despite these advantages, their dispersive nature inherently produces beam squint effect in patterns. Here, we propose use lens that compensates dispersion leaky wave,...

A novel substrate-integrated waveguide (SIW) horn antenna with partially detached broad walls is designed and analyzed. The conventional SIW suffers from narrow-operating bandwidth, which mainly results the mismatch at aperture between substrate free space. However, detachment of makes left not only act as wave-guiding structure but also impedance transformer, brings much size reduction in comparison antenna. Moreover, graded dielectric constants distributed propagating direction realized...

This paper presents the seismic upgrade of existing frame structures by using self-centering (SC) concrete wall with friction dampers. Working principle, numerical simulation, and design procedure system are introduced, application was made in resilience a five-story reinforced (RC) building located high-seismicity area China. The original building, as corridor, connects two adjacent buildings evaluated seismically deficient. Three posttensioned walls devices were therefore used to provide...

Since optical links are easily blocked by obstacles in the environment, they have been considered difficult to directly perform wireless communications. However, reconfigurable intelligent surfaces (RISs), as a new type of digital coding meta-materials, can significantly improve coverage communication establishing links. We propose controllable multi-branch system based on RISs. By setting up multiple RISs artificial channels built performance and reduce outage probability. In this paper, we...

In this article, a seven-band omnidirectional rectenna is proposed for the first time to harvest RF energy. The designed operates in following practical and up-to-date frequency bands: GSM1800 (1.8 GHz), LTE (2.1 WLAN/Wi-Fi (2.4 5.8 5G bands (2.6, 3.5, 4.9 GHz). To obtain multiband rectenna, novel rectifier introduced composed of three optimized single shunt diode rectifiers parallel. Overall RF-to- dc conversion efficiencies as high 44.4% @ 1.84 GHz, 43.9% 2.04 45.4% 2.36 43.4% 2.54 36.1%...

A dual-slot feeding structure is used in the design of a two-layer E-band substrate integrated array antenna to realize wideband or dual-band characteristic. Several metallic vias, which are equivalent open-ended air-filled circular waveguides, fabricated through printed circuit board process form radiating elements. They fed by parallel waveguide (SIW) network underneath these elements obtain compact configuration. First all, single element modeled and investigated recognize characteristics...

In this article, we present two efficient leaky-wave antennas (LWAs) with stable radiation pattern, operating at 60 GHz. Both exhibit attractive properties such as significantly reduced beam-squint, low loss, sidelobes, high directivity, and simple manufacturing. The beam-squint of conventional LWAs is by refracting the leaked waves in a dispersive lens sidelobe levels are achieved tapering leakage rate along aperture. Since implemented groove gap waveguide technology, losses low. different...

The utilization of beam-carrying orbital angular momentum (OAM) for free-space optical (FSO) communication can increase channel capacity. However, the misalignment beam is an effect that must be mitigated in FSO systems. Due to robustness deep learning technology pattern recognition, a neural network structure proposed and improved mitigate error. First, compared with simple convolutional proposed, data augmentation adopted training. Then, view-pooling layer added after layer. This...

Abstract Tying isolated vortex knots in complex optical fields has been recently realized using spatial light modulators (SLMs). These traditional devices suffer from low efficiency, narrow bandwidth, and they cannot be integrated to nanophotonic systems. Here, the design realization of metasurface holograms (MHs) is reported efficiently generate a broad spectral region. In comparison with conventional devices, thicknesses pixels MHs are both subwavelength scale, size created knot can six...

In this work, a novel planar leaky-wave antenna (LWA) and its array are proposed presented for CubeSat communication applications. Using the substrate-integrated waveguide (SIW) technology, LWA is implemented by etching periodic fan-shaped slots on top of an SIW. These exhibit extraordinary circular polarization (CP) radiation in high efficiency over wide frequency band. Moreover, switching excitation ports, both left-handed (LH) right-handed (RH) CPs achieved beam steering range backward or...

Abstract Currently, with the continuous advancement of underwater robotic systems and technologies, associated acoustic payloads are required to develop towards miniaturization multifunctional integration. In design application systems, effects scattering resulting performance degradation cannot be ignored. To address this issue, paper constructs a finite element model densely packed array elements’ in dual circular ring using software. Based on simulations sound waves at different...