نوع مقاله : مقالة تحقیقی (پژوهشی)
نویسندگان
1 دانشجوی دکتری، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
2 دانشیار، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
3 استادیار، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
4 استاد، عضو هیئت علمی دانشگاه رنِس فرانسه
چکیده
در مقاله حاضر، مبتنی بر استفاده از دی‌الکتریک‌های پلاسمایی در امتداد روزنه آنتن شیپوری هرمی، آنتن جدیدی معرفی می‌شود که دارای قابلیت بازپیکربندی و کنترل پذیری در مقدار بهره و جهت پرتو تشعشعی است. در این آنتن، چهار تیغه‌ی پلاسمایی عمود بر دهانه روزنه و در امتداد محور آنتن و چهار تیغه-ی پلاسمایی دیگر به‌صورت مورب با تیغه‌های قبل قرار دارند. برخورداری از قابلیت روشن و خاموش شدن مستقل هر تیغه و یا کنترل مقدار فرکانس پلاسما در تیغه‌ها سبب می‌شود در هر حالت امکان هدایت پرتو تشعشعی و نیز کنترل مقدار بهره برای آنتن وجود داشته باشد. تحلیل‌های پارامتری در خصوص گسترش طول و زاویه‌ی این تیغه‌ها نشان می‌دهد که انتخاب مقادیر اولیه مناسب برای ابعاد و زاویه تیغه‌ها نقش مهمی در بازه زاویه‌ای هدایت پرتو و مقدار بهره آنتن دارد. این ساختار برای آنتن شیپوری در فرکانس مرکزی GHz 10 طراحی‌شده است و امکان طراحی آن برای سایر بازه‌های فرکانسی نیز وجود دارد. در نمونه طراحی‌شده، مقدار کنترل‌پذیری بهره تشعشعی با استفاده از تیغه‌های پلاسمایی dB 5/6 و حداکثر میزان هدایت پرتو تشعشعی تا 12± درجه مشاهده‌شده است. کنترل دینامیکی مقدار بهره و هدایت جهت پرتو، کاربردهای زیادی در سیستم‌های ارتباط فضایی دارد.
کلیدواژه‌ها
- آنتن شیپوری هرمی
- تیغه های دی الکتریک پلاسمایی
- هدایت پرتو تشعشعی
- کنترل بهره
- آنتن دارای قابلیت بازپیکربندی
- آنتن دارای قابلیت هدایت پرتو
- مخابرات فضایی
موضوعات
عنوان مقاله [English]
A Reconfigurable and Steerable Horn Antenna Using Plasma Dielectric Slabs for Controllable Gain and Beam Steering
نویسندگان [English]
- Jaafar Bazrafshan 1
- Fatemeh Sadeghikia 2
- Ali Karami Horestani 3
- Mohamed Himdi 4
1 PhD Student, Associate Professor, Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, Iran
2 Associate Professor, Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, Iran
3 Associate Professor, Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, Iran
4 Professor, University of Rennes 1
چکیده [English]
This paper presents a novel approach for designing a reconfigurable and steerable antenna utilizing plasma dielectric slabs along the aperture of a pyramidal horn antenna. The antenna offers electronic control over both the radiation gain and the direction of the main beam. The proposed configuration consists of four plasma slabs aligned perpendicular to the horn aperture along the horn axis, complemented by four diagonally connected plasma slabs. Each plasma slab can be independently switched ON or OFF, enabling dynamic adjustment of the radiation gain and steering of the main beam. Numerical investigations demonstrate that toggling the plasma slabs or controlling the plasma frequency of these slabs allows for fine-grained control over the radiation gain and beam steering of the pyramidal horn antenna. The selection of appropriate dimensions and angles for the plasma slabs plays a crucial role in achieving the desired beam steering angle and radiation gain control. To validate the concept, the proposed antenna configuration is designed and numerically simulated at a frequency of 10 GHz. The results indicate that the radiation gain of the antenna can be significantly enhanced, reaching up to 6.5 dBi. Additionally, the main beam direction can be steered within a range of ±12 degrees.
کلیدواژه‌ها [English]
- Horn antenna
- Dielectric plasma slabs
- Beam direction
- Gain control
- Reconfigurable antenna
- Beam steering antenna
- space communication
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