1,721,143 research outputs found
A finite element approach to the electromagnetic interaction with rotating penetrable cylinders of arbitrary cross section
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Conductor losses effect on RLSA antennas
No full textIn this paper, we consider the effect of the finite conductivity on the design of a radial line slot array (RLSA). Such an effect can be not negligible at high frequencies, especially when low cost metallization techniques are adopted. We show how this effect can be easily introduced in the numerical modeling of the antenna. As a matter of the fact, we extend the analytical evaluation of the dyadic admittance Green's function to the case of a low, arbitrary impedance surface, and we use it within a Method of Moment (MoM) for RLSA. The results of the MoM numerical simulations have been tested against those by commercial codes for different conductivity values
Asymptotic approximation of mutual admittance involved in MoM analysis of RLSA antennas
No full textIn this paper, a computationally efficient method of moments (MoM) formulation is presented that makes use of an approximate asymptotic formula for the slot mutual admittance. The formula accuracy to the asymptotic order O(r-3/2) gives sufficient precision for moderate slot distance (1.5-2 wavelengths). In a typical radial line slot array analysis, this permits avoiding the numerical integration in more than 90% of the slot pairs with a savings of CPU time of the same order. © 2009 IEEE
Influence of the Finite Slot Thickness on RLSA Antenna Design
No full textIn this communication, we consider the effect of the thickness of the plate where slots are cut into, with reference to the design of a radial line slot array antenna. We show that the zero-thickness approximation results in a significant lack of accuracy even though the slot thickness is of the order of one-thirtieth of the wavelength. Then, we investigate and compare the accuracy and the efficiency of various approximate numerical techniques that can be conveniently employed in the full-wave analysis and optimization process of the antenna
Comments on “A novel technique in simplifying the fabrication process and improving the reflection coefficient of the linear polarized radial line slot array (LP-RLSA) antennas”
No full textInfluence of the finite conductivity on RLSA antenna design
No full textIn this paper, we consider the effect of the finite conductivity on the design of a radial line slot array (RLSA). Such an effect can be not negligible at high frequencies, especially when low cost metallization techniques are adopted. We show how this effect can be easily introduced in the numerical modeling of the antenna. As a matter of the fact, we extend the analytical evaluation of the dyadic admittance Green's function to the case of a low, arbitrary impedance surface, and we use it within a Method of Moment (MoM) for RLSA. The results of the MoM numerical simulations have been tested against those by commercial codes for different conductivity values
Circular polarized RLSA optimization: A physics based approach
No full textThis paper shows a new approach to optimize a circular polarized radial line slot array based on the physical picture behind the working mechanism of the antenna. The optimization procedure converges to the optimum solution in a very limited number of steps allowing us to use a full-wave analysis of the entire antenna. © 2013 EurAAP
Efficient Method of Moments Analysis of Radial Line Slot Antennas
No full textIn this paper a computationally efficient method of moments (MoM) formulation is presented for the full-wave analysis and design of radial line slot antennas (RLSAs). The method efficiency is based on an ad-hoc representation of the internal problem (electrically large circular cavity) Green's function, which is split into the sum of a parallel plate waveguide contribution and a rim effect contribution, expanded on radial modes. Comparisons with a commercial general purpose MoM software were performed on a complete RLSA to demonstrate the accuracy and the efficiency of the approac
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