隔板極化器最佳化設計暨利用短樁改善號角天線之輻射特性

Optimization of Septum Polarizer Design and Polarizer with Stubs to Improve the Circular-Polarized Radiation of the Horn Antenna

李雯雯(Wen-Wen Lee)

指導教授 ： 周錫增

元智大學/電機通訊學院/通訊工程學系/碩士(2008年)

https://doi.org/10.6838/YZU.2008.00110

摘要

本論文利用程式語言撰寫ㄧ介面程式可控制商業軟體模擬
架構極化器幾何結構變化，透過基因演算法計算，調整最佳化尺
寸，以達理想目標；另外探討在極化器中置入短樁，包括金屬材
質與介電材質，以及對稱性架構與非對稱性架構探討其對圓極化
參數之影響並模擬與實際設計ㄧ短樁隔板極化器可改善被擠壓
的號角天線極之輻射特性。

關鍵字

極化器 ； 隔板極化器 ； 基因演算法 ； 短樁

並列摘要

A genetic software program is developed to provide seamless integration among commercial codes for analysis and simulation of electromagnetic problems. Combined with the genetic algorithm, the developed program is able to perform automatic tuning of the structures
for optimized design of the polarizers in horn antennas.
Numerical results show that proper stub insertions may provide additional freedoms to optimally design the polarizer with a better return loss and a flexible phase tuning, which is particularly useful to compensate the deficiency of a horn antenna to radiate better circularly polarized fields. Improvement of the circularly-polarized(CP) radiation of horn antennas is achieved through the insection of either dielectric or metallic about stubs
inside the waveguides.

並列關鍵字

polarizer ； septum polarizer ； genetic algorithm, stubs

參考文獻

[1]D. Davis, O. J. Digiondomenico, J.A. Kempic, “A new type of circularly polarized antenna element”, IEEE Trans. Microwave Theory Tech., Vol. 9, pp. 26-33, 1961

[2]K. K. Chan, “Dual band/wide Band waveguide polarizer” 2000 Asia-Pacific Microwave Conference, pp. 66-69, Dec. 2000

[3]N. Yoneda, M. Miyazaki, “A design of novel grooved circular waveguide polarizers”, IEEE Trans. Microwave Theory Tech. Vol. 48, pp. 2446-2452, Dec. 2000.

[4]Y. R-SAMII, M. ERIC, “Electromagnetic Optimization By Genetic Algorithms”, John Wiley & Sons, New York, 1999.

[6]R. Behe, P. Brachat, “Compact duplexer-polarizer with semicircular waveguide”, IEEE Transaction on Antennas and Propagation, Vol. 39, No. 8, August 1991, pp. 1222-1224