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A novel double layer Dual Band Frequency Selective Surface (FSS)with miniaturized element is presented, in which each periodic cell consists of parallel metallic patch of two different sizes. The FSS with such structure is designed, The simulated results show that the FSS dimension is miniaturized to 0.06 λ (λ refers to the resonant wavelength of 2GHz). In addition, it also has good stability to oblique...
Aiming at the problem of the difficulty in the range alignment of HRRP because of more than one target in the window of radar image, this paper propose a alignment method for multiple targets in the target group by using an image segmentation method. First, we accumulate the HRRP of the target, and get the HRRP process diagram. By calculating the correlation coefficient between each frame of HRRP...
It is a trend to replace the traditional discrete antenna with the array plane antenna, and the new electromagnetic interference problem produced by the array plane antenna is also the focus of the current research. This paper uses both simulation and experiments to research the issue about suppression of electromagnetic interference under the condition of two array plane antenna be laid in same plane...
In this paper, we propose a high order novel wide band pass frequency selective surface (FSS). which consist of patch array, lattice array and transmission line (medium layer), the simulation result shows that the 1dB fractional bandwidth of the new FSS is about 50%, the 1dB pass band of three order FSS is from 7.79GHz to 12.49GHz, the insert loss is flat enough in the whole pass band, the suppression...
High density small cells with large number of simultaneously connected devices will be controlled by the macro cell in the future 5G wireless standards. In this context, interference management becomes critical in achieving high spectral efficiency. An approach called interference alignment (IA) technique has shown great promise in many theoretical studies. However, the performance improvement brought...
This paper presents a 3D frequency selective rasorber consisting of 2D periodic array of open-circuited and short-circuited parallel-plate waveguides. The passband is obtained by the lossless open-circuited parallel-plate waveguide, while two absorption bands located at both sides of the passband are produced by the lossy short-circuited parallel-plate waveguide loaded with a chip resistor. A capacitor...
The optical and electrical properties of organic solar cells (OSCs) with short-pitch metallic gratings introduced in conventional OSCs are investigated in the case of oblique incidence. Finite-difference frequency-domain (FDFD) method is applied to solve the Maxwell's equations and semiconductor equations for obtaining the optical and electrical properties of OSCs. It is found the light absorption...
Based on the Planck's law and integrality the directional hemisphere reflectivity (DHR) and the Kirchhoffs law. And referred to the Torrance-Sparrow model and the five-parameter semi-empirical model, a new Bidirectional reflection distribution function model (BRDF) is developed in different temperature of material surface, this model will be applicable for various materials.
Recently graphene has attracted tremendous attention for its excellent properties Numerous novel graphene-based devices have come out, showing great potential of graphene for tunable applications at THz band In this paper, by stacking a monolayer of graphene on the top of the polymer substrate, a graphene-based tunable absorber is obtained owning to the voltage-controllable conductivity of graphene...
The use of sparse reconstruction for DOA estimation has the advantages of low requirement for the number of snapshots and applicative for coherent signal etc. The solution of sparse signals is generally translated into the L0 norm minimization problem. This paper proposes a new threshold function to approximate L0 norm optimization combined with Newton method, besides, it further puts forward the...
A dual-band Reconfigurable frequency selective surface composite structure based on MEMS Switch is proposed, which includes eight MEMS switches in one period. The use of the FSS element with the rectangular loop shape is benefit for the realization of dual-band reconfiguration. The FSS composite structure consists of the multilayer substrates and foams, which results in the good electrical performance...
In this paper, the coefficients of reflection and transmission of high-speed dielectric target is discussed by Lorentz-FDTD method. In this method, two coordinate systems are defined, one is the laboratory coordinate system, marked by K; another is the moving coordinate system, marked by K'. The Lorentz transformation and interpolation are used to connect the laboratory coordinate system and the moving...
Since some Gaussian noises may attach to the Electromagnetic Environment (EME) measurement spectrum, it's difficult to analyze test data or extract feature. There are some denoising methods, but we do not have any evaluation indexes to judge the effect of denoising methods. In view of this situation, a set of denoising effect evaluation indexes based on spectrum features is proposed in this paper...
A novel split ring slot antenna with multiband characteristics is proposed in this paper. The antenna consists of a split ring slot and a ring slot on top surface as the radiator. A novel split ring slot antenna is proposed to realize polarized radiation based on the SIW cavity. Three patch-like radiation patterns and one monopolar radiation pattern at four different frequencies are excited by the...
A miniature and wideband helix antenna with gradient radius is proposed in this paper. The contour of the antenna is as a cone with small bottom and large top radius. An extra microstrip line is connected to the bottom end of the helix for impedance matching. The antenna is modeled and simulated. The simulated results show that the antenna can cover the bandwidth of 40% in X-band. It's expected this...
Two antennas with bidirectional same-sense circularly polarization are presented in this paper. The first antenna consists two back-to-back patches with a common ground and a stepped microstrip feeding line. The two patches are behaving as a cavity by coupling through a slot on the common ground, providing bidirectional patterns with the same-sense circular polarization. Based on the dual-patch cavity...
This study presents a newly modified unidirectional bowtie antenna with dual-band operation. The proposed antenna consists of two bowtie dipole elements, a square loop, a parallel-strip line (changed from a microstrip line), and a ground plane. The dual-wideband operating characteristics of this antenna are achieved by means of the square loop. Experimental results show that the proposed antenna has...
To investigate the problem of errors for radar tracking low angle target, based on the method of angle tracking and the parabolic equation, a suite of simulated results of elevation errors is presented. The errors of elevation angle have been calculated in conditions including evaporation duct, surface duct, and duct profiles changed with range, which demonstrate that the variation of atmospheric...
A novel design approach to the absorber screen based on the receiving antenna technique is presented in this letter. According to the similar performance principle of absorber and receiving antenna, the dual-polarized magneto-electric dipole antenna is improved and optimized by the software HFSS to obtain a thin and broadband absorber screen. And the simulation result shows that a 78% wide band for...
Based on the peculiar refractive index feature of complementary split-ring resonator (CSRR), a low-RCS (LR) microstrip antenna is proposed. By loading CSRRs on the ground plane along two adjacent edges of the radiation patch, the scattering field is deflected and a spatial reduction of out-band radar cross section (RCS) is achieved. Due to the polarization selective characteristics of CSRR, each CSRR...
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