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In this paper, a hybrid volume-surface electric field integral equation approach is developed to calculate the electromagnetic scattering from planar thin dielectric structures (dielectric materials or composite conductor-dielectric objects). The volume integral equation (VIE) is used for thin dielectric layers. To reduce the number of unknowns and accelerate the solution, the prism elements are employed...
A conformal elliptical tapered slot antenna has been designed and developed for urtrawideband (UWB) wireless communications. It is studied mounted on a cylindrical surface and is proven to operate equally well compared to its planar rival. Return loss, gain and E and H plane radiation pattern simulations are presented covering the whole ultrawideband. The antenna has demonstrated good performance...
Sub-wavelength imaging, which can transform evanescent wave into travelling wave and utilize wave component with small wave-vector, is receiving much study interest. Both negative refraction and beam forming can realize sub-wavelength imaging, and their mechanism are analyzed and compared. The refraction behavior under different incident angle is measured experimentally, and it is found that larger...
This paper investigates the application of bandpass FSS radome with an enclosed antenna to reduce its backward RCS outside of its operating band. A planar array antenna covered with FSS radome is designed and constructed. In order to study the effects of a dielectric embedded FSS on an enclosed antenna pattern, we adopt the ray tracing technique to compute the near field pattern of the antenna-FSS...
A novel bandpass miniaturized-element frequency selective surface with tunable frequency characteristic is presented in this paper. The structure is composed of two Meander-line arrays printed on opposite sides of a dielectric substrate and varactor diodes are positioned between the neighboring Meander-line. By biasing the varactors with the Meander-line themselves, the ability to electronically tune...
A novel design for a multiple frequency selective surface (FSS) screens with dissimilar periodicities for directivity enhancement of a conventional dual-band patch antenna is presented. In the proposed new design, two square-loop arrays with different periodicity are placed above and below a thin dielectric layer. Using an efficient cascading procedure, several important parameters that characterize...
A simulation of a small sized antipodal Vivaldi antenna for ultra-wideband (UWB) applications is presented in this paper. By using commercial electromagnetic simulation software-Ansoft HFSS, both the simulated and optimized results have been shown for the Vivaldi antenna printed on the substrate of FR4. The results regarding standing wave ratio (VSWR), far field pattern, group delay and antenna gain...
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