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We propose a theoretical study on dual-frequency conformai antenna made by carbon nanotubes (CNTs) which is suitable to be printed on commercially available paper substrate. According to the simulation result, it is found that the radius of the conformal cylindrical surface and the conductivity of CNTs contribute little to the antenna performance. By further integrated onto the textile substrate,...
In this paper, one fast method for analyzing printed circuits based on matrix high-dimensional interpolation schemes has been presented. By virtual of the bi-interpolation on the plane of the frequency direction and the dielectric constant direction, the proposed method can greatly reduce the global time consuming of matrix fillings, and it can greatly improve the efficiency of multi-parameter scanning...
In this paper, the generalized single-source tangential equivalence principle algorithm (GSST-EPA) is proposed to solve the electromagnetic scattering of array structures with very small distance or even connected elements. This GSST-EPA can reduce the number of unknowns by half via the extinction theorem, and keep the good accuracy by using tangential field projection. Based on source reconstruction...
In this paper, a wideband filtering power divider is designed by employing a stub-loaded ring resonator. The first two resonant modes of the ring resonator are excited to form the filtering passband. To improve the passband skirt, two transmission zeros near the passband are then introduced by mounting an open stub along the ring resonator. After installing two coupled lines at two output ports, one...
Based on one dimensional first-order basis function, the construction process of the second and third-order scalar hierarchical basis functions in two dimensional case is given. The second and the third-order basis functions are applied to discontinuous Galerkin time domain (DGTD) algorithm. The influence of order of the basis function in accuracy of DGTD is analyzed.
In this work, a compact tag antenna based on loop structure is proposed for radio frequency identification (RFID) system. The tag has a small overall size of 55 mm × 41.5 mm × 3 mm, with a single conductor layer for lower cost and easy fabrication. Simulation results show that the antenna has a 3 dB bandwidth of 30 MHz when placed on a 200 mm×200 mm metal plate. The antenna can also be mounted on...
A bi-mode active frequency selective surface (AFSS) switching between band-pass and band-stop modes is presented in this paper. For large scale application, a novel bias network based on Wheatstone bridge is adopted in design. The good performance of AFSS proves its potentials in improving the security of indoor communication.
A substrate integrated waveguide (SIW) H-plane horn antenna loaded with dipole array is proposed. The horn antenna works with the gain from 9.0 to 11.7 dBi, high front-to-back ratio and stable radiation patterns in the entire Ka-band.
Belongs to the problem of discharge hazards together with ESD, RF discharge, whose characteristics are influenced by different experimental conditions, is studied. The conclusions of RF discharge characteristics of argon are given through theoretical analysis and multi-physics simulation.
Soft source consisting of impressing a current has been successfully added to the pseudospectral time-domain (PSTD) method in this approach. Its physical meaning well understood has been with analytical solution, and applied to numerical PSTD method. In order to increase computational efficiency, the alternating-direction-implicit (ADI) technique is used. Compared to the hard source consisting of...
In the process of location and rectification of signal source with exceeding radiation in electronic module or device, there constantly are signals mixing together in frequency domain, which could not be separated with the method of single-channel blind source separation (SC-BSS) effectively. For this issues that SC-BSS have no use in solving mixed signals, this paper proposes to separate mixed signals...
Method of Shooting Bouncing Rays (SBR) can quickly calculate radar cross section (RCS) of cavity targets and handle multiple scattering between target structures as a high-frequency algorithm. In this paper, a novel method of ray tracing has been proposed by utilizing Unigraphics (UG) 3D modeling features and secondary development tool UG open application program interface (UG/OPEN API). Compared...
Foam on the sea surface affected by wind speed is considered as one of the reasons for sea peak, which increases the risk of radar false alarm. In this paper, a foam-containing sea surface is chosen as a geometrical model solved by small slope approximation (SSA) and vector radiation transfer (VRT). The backscattering characteristics of the foam layer were calculated using VRT, and SSA was employed...
This paper designs an ultra-broadband absorber based on tightly coupled array (TCA), whose reflectance coefficient is expected to be below −10dB from 2.43GHz to 16.65GHz theoretically. It is found that the TCA absorbers are ultra-wideband, low-cost, low-profile, and conformable. The results of theory and simulation are given.
Polarization sensitive arrays can suppress the interferences by taking advantage of differences in polarization domain while the interferences and desired signals are from the same direction. In this paper, a 4-element dual-linear-polarized array is used to realize the anti-jamming function in joint spatial-time-polarization domain. A Right-Hand Circular Polarization (RHCP) constraint is added to...
This paper demonstrates the design of the THz triple-push VCOs using slow-wave effect. The VCOs are implemented by 65nm CMOS process. Slow-wave coplanar waveguides(S-CPW) are applied in the VCO as inductors. Co-simulation results are given in this letter. The VCO using S-CPW consumes 49mW of DC power while generating −9.31 dBm of output power with a phase noise of −80 dBc/Hz at 1MHz offset from a...
An iterative least-squares (RLS) anti-jamming technique is applied to a conformal antenna for improving the adaptive anti-jamming performance. This method offers a solution to synthesize predefined radiation pattern. By iterative calculation, a set of constraint weights of linearly constrained minimum variance (LCMV) can be obtained to improve the adaptive nulling depth and to expand the angle coverage...
A coupling reduction method is proposed by using stacked electromagnetic band gap (EBG) structure for a two-element antenna array. The stacked EBG is a periodic multilevel layered electromagnetic band gap structures (PML-EBG). The PML-EBG is set in the middle of two identical patch antennas with distance of 0.13λ. The proposed antenna operates at 2.55GHz. A good isolation is achieved by the use of...
In this article, the JE convolution-finite-difference time-domain (JEC-FDTD) method is applied to research the influence of the electromagnetic (EM) wave's scattering characteristics on the dusty plasma. The correlation properties of dusty plasma are analyzed by using radar cross section (RCS). This study provides some insights for the dusty plasma. Meanwhile, some valuable conclusions are achieved.
The Feature Selective Validation (FSV) Method has been developed as a standard technique to mimic an expert's opinion of concurrence between computational electromagnetics (CEM) and measurement datasets. In this paper, FSV is used to compare the design simulation and measurement of the microstrip antenna to verify the difference between the simulation data and the measured data. First, a typical patch...
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