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We describe in this paper the synthesis of directive axis-symmetrical compact shaped horn antennas. The proposed CAD tool is based on the combination between a FDTD solver in cylindrical coordinates and a genetic algorithm. A low-cost fabrication technique using a metallized foam 3-D technology is employed for experimental validations in Ka-band. The measurement results are in excellent agreement...
An accurate optimization tool has been developed to design arbitrarily-shaped axis-symmetrical devices. It is based on the combination between a genetic algorithm (GA) and a finite-difference time-domain (FDTD) solver formulated in a cylindrical coordinate system. For validation purposes, this tool is applied to design several smooth-walled compact conical horns with a large flare angle (90°) in the...
This paper presents an electromagnetic synthesis tool for the design of axis-symmetrical radiating structures has been described. It is based on the combination of a fast BoR-FDTD solver coupled to a real-coded GA. To reduce the computation time, grid-computing techniques have been applied. The implementation has been validated through the synthesis of conical horn antennas loaded with shaped lenses...
We investigate here the potentialities of shaped dielectric dome antennas for shaped beam applications at millimetre waves. To this end, we firstly describe the synthesis methodology that has been implemented for the design of any kind of multi-shell / multi-material dome antennas of arbitrary shapes. The design procedure consists in a Genetic Algorithm (GA) combined with an asymptotic method of analysis...
This paper describes a body-of-revolution (BOR) FDTD solver implemented for the analysis and synthesis of axis- symmetrical radiating structures. It is first applied to analyze an extended hemispherical integrated lens antenna (ILA) at 62.5 GHz. Comparison with a full 3-D FDTD solver and commercial software shows an excellent agreement between the three approaches, and confirms the important computational...
This paper describes a lens shaping optimization tool combining a genetic algorithm (GA) and a 2-D FDTD solver. This CAD tool has been implemented to synthesize two kinds of integrated lens antennas (ILAs), namely: 1) reduced-size ILAs with flat-top radiation patterns (in TM mode), and 2) compact ILAs with high aperture efficiency (in TE mode). In the first case, several optimization strategies are...
Dielectric lens antennas are quasi-optical devices well suited for shaped-beam applications at millimetre waves. In this paper, we present a powerful computer-aided design (CAD) tool for the analysis and optimization of multi-shell integrated lens antennas (ILAs) of arbitrary 3-D shape. The optimization technique is based on a binary genetic algorithm (GA) coupled to the hybrid geometrical optics...
The possibility of a beam-switching lens antenna off-axes performance improvement via the lens profile optimization is investigated. The problem is formulated in 2D and solved by using the Muller boundary integral equations discretized with the trigonometric Galerkin scheme that has guaranteed and fast convergence as well as controllable accuracy. Optimization routine is based on the genetic algorithm...
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