Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TA4
Session:
Number:3TA4-3
Optimization of Radiation Pattern for Narrow-wall Slotted Waveguide Arrays Using HOBBIES
Weixin Zhao, Daniel Garcia-Donoro, Yu Zhang, Xunwang Zhao, Tapan K. Sarkar,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Narrow-wall inclined slots (Fig. 1) are commonly used in practical radar applications. There have been a lot of publications in the past on the analysis and design of these types of slotted waveguide antennas [1]?[3]. These works have focused on analyzing the structure using different numerical methods, but there is no publication discussing the optimization of the slotted waveguide, as the structural meshing of the slotted waveguide will generate a large number of unknowns and it is very time consuming to analyze this structure. This is still an issue with the Method of Moments technique to analyze this structure on a PC due to the limitation of the computing power. Even with the help of high performance clusters, it is not an easy task, not to mention optimizing the entire array, since it contains so many variables. This necessitated the need for a reliable optimization tool to handle a problem with a large number of variables to optimize. And this paper is motivated by this need, and focuses on the optimization of radiation patterns of narrow-wall slotted waveguide arrays. In this paper, the commercial software HOBBIES (Higher-Order Basis Based Integral Equation Solver) [4]-[5] will be used to analyze the structure. HOBBIES is an out-of-core parallel solver that can be executed across multiple platforms to solve complicated EM problems and it provides solutions based on the Method of Moments. By using HOBBIES, several PCs can be combined to form a parallel computing platform, thus being able to generate solutions for very complex problems. Several optimization algorithms are available within HOBBIES, such as BOBYQA, particle swarm optimization, Simplex algorithm. In this paper, the BOBYQA has been used to optimize the radiation pattern of the slotted waveguide structure. BOBYQA is one of the best state-of-the-art derivative free optimization methods dealing with hundreds of variables proposed by M. J. D. Powell in 2009. Details of this algorithm are in [6].