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A microwave gradient meta-surface is designed and fabricated. The structure is consist of a stack of two-dimensional (x-axis and y-axis) arrays of gradually-varied sub-wavelength elliptical rings, a dielectric substrate and a metallic ground plane. Both theoretical and experimental studies are conducted to demonstrate that the carefully designed y-axis phase gradient meta-surface supports high-efficiency...
This letter introduces a wideband conformal log-periodic dipole array (LPDA) antenna array mounted on a foam cone for direction finding application. To miniaturize this conformal LPDA antenna array, the LPDA antenna with curvilinear dipoles is used. Simulated and measured results show the LPDA antenna with curvilinear dipoles has good radiation performances. Mounting on a ROHACELL foam cone, the LPDA...
Based on the new time-domain finite integration theorem (TDFIT), a fast and accurate method is proposed to analyze broadband antenna-radome interactions in time domain. Due to the time-domain feature, broadband characteristic is obtained in a single simulation. In numerical simulations, the antenna array is placed inside an enclosed or semi-closed radome by using a presented local waveguide port....
In this paper, two metamaterial antennas have been presented: three-dimensional (3D) flat lens antenna and 3D flattened Luneburg lens antenna, which show great advantages to the traditional antennas. This is an important application of metamaterials in the microwave engineering.
It is known to us, double-ridged horn antenna is one of common and important antenna types, it has been widely used in the EMC, measurement, radar and communication system. A 118GHz double-ridged horn antenna that possesses high performance is designed with the HFSS. VSWR, Gain and radiation pattern of the antenna can fulfill engineering demands based on the simulation of HFSS. Further, this paper...
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