سنتز پرتو مسطح در آنتن بازتابنده چند تغذیه ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، مرکز تحقیقات مخابرات ایران، تهران، ایران

2 استادیار، پژوهشگاه ارتباطات و فناوری اطلاعات، پژوهشکده فناوری ارتباطات، تهران، ایران

چکیده

تحقیقات بسیاری بر روی آنتن‌های بازتابنده با هدف شکل دهی پرتو با استفاده از شکل‌دهی سطح انجام گرفته است. با این وجود مطالعات اندکی بر روی رهیافت چند تغذیه‌ای انجام گرفته است. هدف این مقاله تحقق پرتو مسطح در آنتن‌های بازتابنده‌ با استفاده از رهیافت چند تغذیه‌ای است. در این راستا بر پایه الگوریتم ژنتیک و بکارگیری روش نور فیزیکی (PO)، ضرایب تحریک عناصر تغذیه آنتن بازتابنده در جهت تحقق پرتو موردنظر سنتز می‌گردند. در این مقاله همچنین، روشی جهت کاهش زمان محاسبه‌ی انتگرال‌‌های تشعشعی PO پیشنهاد شده است. در روش حاضر انتگرال‌های تشعشعیPO طی نگاشتی به فضای دو ‌بعدی تصویر می‌گردد و در نتیجه زمان محاسبات به میزان 30 درصد کاهش می‌یابد. روند ارائه شده‌ در جهت تحقق پرتو مسطح در بازه‌ی زاویه‌ای 20- تا 20+ مورد استفاده قرار گرفت و خصوصیات پرتو بدست آمده با آنچه از طریق روش شکل‌دهی به سطح بازتابنده انجام گرفته، مقایسه شده است. نتایج نشان می‌دهد که رهیافت چند تغذیه‌ای می‌تواند پرتو مورد نظر را با دقت بهتری حاصل کند.

کلیدواژه‌ها


عنوان مقاله [English]

The Flat-Topped Pattern Synthesis of the Multi-Feed Reflector Antenna

نویسندگان [English]

  • Mohammad Hossein Amini 1
  • Iman Aryanian 2
1 PhD Student, Iran Telecommunication Research Center, Tehran, Iran
2 Assistant Professor, Research Institute of Communication and Information Technology, Research Institute of Communication Technology, Tehran, Iran
چکیده [English]

Numerous researches have been performed on the reflector antenna for realizing beam-shaping
using level-shaping. However, little study has been done for realizing the shaped beam through
the multi-feed approach. The main goal of this paper is to provide a synthesis procedure for
realizing the flat-topped pattern in reflector antennas using the multi-feed approach. In this way,
based on the genetic algorithm (GA) and utilizing the physical optic (PO) method, the excitation
coefficient of the feeding array is synthesized to achieve the desired pattern. Furthermore, in this
paper, an efficient method for reducing the computational time of PO integrals is introduced. In
this way, the 3D PO integrals are mapped to 2D integrals; which results in about 30%
computational time reduction. The proposed procedure is employed to realize a flat-topped
pattern in the angular scope of -20o to +20o and the radiation characteristics are compared with
those presented through the shaped reflector method in the literature. Results show that the
multi-feed approach obtains the desired beam more accurately.

کلیدواژه‌ها [English]

  • Multi-Feed Reflector Antenna
  • Flat-Topped Pattern
  • Physical Optic
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