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A novel tunable frequency selective surface is presented in this paper. The FSS is composed of two stacked metallic layers. By loading different capacitance or inductance, resonant frequency can be easily changed. The simulation results show that when the capacitance is loaded, the resonant frequency can be decreased from 5.8 GHz to 4.7 GHz when the capacitance is increased from 0.1pf to 0.3pf. When...
Two types of cross polarization converters (CPCs) that can simultaneously work at several wavelengths in the reflection mode in near infrared spectrum range are proposed. The first type (type I) is constructed of an L-shaped perforated silver layer (top layer) printed on a dielectric material backed by a gold ground plane, which can work at three frequencies due to the excitation of three different...
A thin SiO2 underlayer has been found to be effective to enhance the microwave properties of FeCoN films on mica substrates. In this study, the effect of SiO2 thickness on static and dynamic magnetic properties was studied. A 160 nm FeCoN film directly deposited on a mica substrate exhibited in-plane isotropy, accompanied by a large coercivity of 70 Oe. By inserting a thin SiO2 as the underlayer,...
A simple planar helical antenna with multi frequency is proposed. The planar helical antenna is made by printed circuit board (PCB) with suitable size and bending helix disposed and integrated on the upper and bottom surface of the printed circuit board connected by the via-holes in the board. The antenna has compact size and superior performance compared with normal-mode helical antenna. In this...
In this paper, novel single-layer left-handed material, consisting of split-square LC resonator (SSLC) coupling with modified H-shaped structure, is proposed. The related electromagnetic characteristics are studied by retrieving constitutive parameters from the simulated scattering parameters. Numerical results show that the negative permeability band of SSLC is relatively broad. The negative refraction...
The coupling properties of an enclosure with apertures illuminated by a high power microwave (HPM) are simulated and analyzed with the finite-difference time-domain (FDTD) method. The variations of coupling electronic field (EC) with positions are investigated, and comparisons among different arrangements and spacing of apertures are made. The resonance effect is also studied. Results from the modeling...
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