This letter presents a novel compact dual-band dual-polarized antenna with filtering structures for Sub-6 GHz base station applications. It is operating at the LTE (2500-2690 MHz) and of 5G (3300-3600 bands, where center frequency upper-band (UB) 1.32 times lower-band (LB). Mutual coupling between LB UB suppressed by introduction stubs near feeding lines. A sufficiently high isolation (>25 dB) also obtained. The size proposed only 0.43 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

We describe the optical transmission properties of a surface plasmon polariton waveguide structure consisting metal-insulator-metal (MIM) and semicircular resonant cavity coupled with key-shaped cavity. Finite element algorithm simulated response MIM structure. The influence coupling length, geometrical size, asymmetry radius on Fano resonance line was investigated. Results demonstrate that variation leads to appearance dual resonances. When materials different refractive index fill in...

In this letter, a low radar cross section (RCS) patch antenna based on holographic metasurface (HM) is proposed. An HM designed to form the proposed antenna. As parasitic structure of antenna, can effectively increase radiation aperture; thus, relatively high gain obtained. At same time, has ability transform propagating wave into surface wave. Therefore, backscattering greatly reduced, resulting in monostatic RCS. A as much 10 dBi and wideband reduction (RCSR) ranging from 5.5 21.5 GHz have...

This letter presents a novel approach to constructing 1-bit coding unit cells for metasurface design and utilizes genetic algorithm (GA) effectively reduce the radar cross section (RCS) of antenna over wide frequency range. Unlike previous methods, this allows manipulation state by modifying sheet impedance resistive graphene rather than altering conventional metallic structures. The units "0" "1" can be achieved utilizing Rs values 10 1000 Ω/sq, respectively, resulting in reflection...

Recently, the coding metasurface has gained significant attention due to its exceptional potential in controlling electromagnetic (EM) waves with rapid development of wireless communication systems. Meanwhile, graphene shows tremendous promise for implementation reconfigurable antennas high tunable conductivity and unique property that makes it a very suitable material realizing steerable coded states. In this paper, we first propose simple structured beam millimeter wave (MMW) antenna using...

In this study, the authors consider adaptive detection with multiple‐input multiple‐output radar in compound‐Gaussian clutter. The covariance matrices of primary and secondary data share a common structure, but different power levels (textures). A Bayesian framework is exploited where both textures structure are assumed to be random. Precisely, follow Gamma distribution or inverse drawn from an complex Wishart distribution. framework, two generalised likelihood ratio tests derived. Finally,...

This study deals with the problem of moving target detection (MTD) for polarimetric multiple-input multiple-output (MIMO) radar in presence Gaussian clutter. The authors extend framework MTD MIMO to a generic number polarisation channels case. Within framework, new generalised likelihood ratio test is first proposed. Then, velocity estimation investigated. maximum-likelihood (ML) estimator developed, and corresponding Cramer–Rao bound derived which serves as benchmark performance. Next,...

Abstract Reducing the number of anchor points and moorings for floating platforms is one ways to reduce integration maintenance costs offshore wind solar farms. This paper focuses on technical feasibility economic viability reducing PV by using a monopile stationary turbine as mooring point introducing shared line system. In this paper, three different layouts their corresponding systems are numerically evaluated optimized under environmental loading conditions commercial software OrcaFlex....

A simple broadband circularly polarised (CP) crossed‐dipole antenna is proposed. The composed of two crossed‐strip dipoles with stepped sections, which are connected by vacant‐quarter rings to realise CP radiation, and a parasitic cross‐slotted square patch (CSSP) consisting modified square‐ring cross‐slot, surrounds the crossed dipoles. By controlling width ratio strip dipole can provide proper amplitude between orthogonal modes achieve wide axial (AR) bandwidth. CSSP generate minimum AR...

For the purpose of optimal design and efficient utilization kind stepped plate radiator in air, this contribution, an approach for calculation directivity pattern sound radiated from a flexural vibration with free edge is developed based on Kirchhoff-Love hypothesis Rayleigh integral principle. Experimental tests fabricated flat two plates one step radiators were carried out. It shows that configuration measured patterns by proposed analytic similar to those calculated approach. Comparison...

Influence of the random error due to distortion antenna reflector was discussed by using two-dimensional fractal model. Firstly, a mathematical model presented investigate its impact on radiation characteristic antenna, which filtered from wavelet analysis method. Based model, density formulation far field with deduced. Finally, 3.7 m and 3 antennas were used validate proposed models, novel simulation method put forward remedy deficiencies existing software tools for error. Results methods...

As we all know, many more dynamic objects appear almost continuously in real world, which are immensely able to impair the performance of majority vision-based SLAM systems that based on static-world assumption. In order improve robustness and accuracy visual high environment, a real-time robust stereo system for scenes was proposed. To weaken influences content, moving object detection method put forward our odometry, then semantic segmentation network combined into extract pixel-level...

A new high-gain cylindrical Dielectric resonator antenna (DRA) with a large bandwidth is proposed. (DR), double-annular patch and metallic cylinder are used to obtain high gain. The mode TM12 excited in the enhance gain of DRA, cavity formed by provides further higher larger bandwidth. measured results demonstrate that proposed DRA achieves 23% from 5.3 6.8GHz VSWR less than two around 11 dBi.

The development of antenna miniaturization technology is limited by the principle electromagnetic radiation. In this paper, structure size reduced nearly two orders magnitude using Acoustic excitation instead For magnetoelectric (ME) antenna, design, simulation and experiment were introduced. Firstly, basic design theory antennas has been refined on a Maxwell’s equations basis, ME designed Mason equivalent circuit model. influence mechanism performance studied model simulation. order to...

The sound velocity in a medium is closely related to its material properties, including composition, structure, density, pressure, and temperature. Various methods have been developed determine the through materials. Among them, strategy based on ultrasound resonance frequency has most widely used due simplicity. However, it requires transducer with wide bandwidth cover enough frequencies perform consequent calculations. In this paper, we develop method for measuring velocity, using...

Solar energy is widely considered a “green energy” source, and to maximize its utilization, efficient solar absorbers that can absorb at various optical frequencies are necessary. We report high-performance, broadband absorber made of just two materials –W Al 2 O 3 . The composed three layers, arranged from top bottom: an dielectric layer, W hole-mesh substrate layer. Finite difference time domain method analysis simulations demonstrated ultra-high absorption rate 97.64% across wide spectrum...

Computing the positions of road signs from in‐vehicle video log images is one most fundamental tasks for intelligent sign inventory. This study analysed vision‐based positioning methods and proposed an analytic model (AM‐RSP) based on error propagation first‐order approximation. Both image noises camera calibration errors were modelled as two sources. The AM‐RSP can evaluate quantify uncertainties both single view stereo methods. Moreover, it quantitatively establish relationship between...

Structural radar absorber has important application in stealth field for its ability to effectively absorb incoming wave and bear the load at same time. Metasurface absorbers can achieve nearly-perfect absorption of wave, have characteristics light weight thin structure, but their bandwidth are usually narrow. To solve this problem, a new method broadening metasurface is proposed work. With varactor PIN diode integrated hybrid manner, continuous tunning discrete switching combined together...

In this paper, a sparse planar array optimization method based on genetic algorithm is proposed for 77 GHz high-resolution imaging. The large scale half-wavelength uniform divided into multiple symmetric subarrays, and the 2-D sidelobe of subarray suppressed by approach, which reduces number elements while remains desired azimuth resolution elevation resolution. performance verified several simulation experiments. results show that optimized arrays can achieve an 0.7° 2.3° in field view...