2008 DEC 15 - (VerticalNews.com) -- "In this paper, we use for the first time the ray-tracing method combined with the HFSS software to analyze lens antennas. HFSS is a very popular commercial tool that can provide very accurate results for the simulation of antennas," scientists in Chengdu, People's Republic of China report.

  "However, because of limitations on computational resources, it is hard to apply to solving large electromagnetic problems. In this paper, HFSS is used to simulate the fields of the feed part of a lens antenna. The ray tracing method is adopted for the lens part. This treatment makes the combined method feasible for solving large lens antennas. In using the ray-tracing method, cubic-spline interpolation is exploited to fit the face of the lens and to solve for the derivatives at each point on the curved surface. Newton's method is applied to find the intercept between the ray and the curved surface. The numerical method proposed in this paper is very suitable for the analysis of dielectric lens antennas with arbitrary feeds and lens shapes. The validity of the idea is demonstrated by comparing the simulation results of this new method with those from using CST (Computer Simulation Technology) software," wrote Y.X. Zhang and colleagues ...read more

  2008 SEP 22 - (VerticalNews.com) -- According to recent research from South Korea, "An automatic phase correction method for phased array antenna (PAA) systems is presented. It is based on finding the optimal phases that maximize the receiving power for a source in a given direction."

  "The optimal phase set is estimated by a genetic algorithm (GA). To test this method we constructed a PAA breadboard with a linear 16-element operating at the X-band, and 4-bit digital phase shifters," wrote S.H. Son and colleagues, Pohang University of Science and Technology ...read more

  2008 MAR 31 - (VerticalNews.com) -- "We assess the accuracy and relevance of the numerical algorithms based on the principles of geometrical optics. (GO) and physical optics (PO) in the analysis of reduced-size homogeneous dielectric lenses prone to behave as open resonators. As a benchmark solution, we use the Muller boundary integral equations (MBIEs) discretized with trigonometric Galerkin scheme that has guaranteed and fast convergence as well as controllable accuracy," investigators in Ukraine report ...read more