ارائه مدل ریاضی بر اساس حساسیت¬های الکتریکی و مغناطیسی برای یک فراسطح منعکس‌کننده ایده‌آل-بدون امواج ناخواسته-
محورهای موضوعی : مهندسی برق و کامپیوتر
الهام مرادی
1
,
مسعود موحدی
2
*
1 - دانشکده مهندسی برق، دانشگاه یزد، یزد، ایران.
2 - دانشکده مهندسی برق، دانشگاه یزد، یزد، ایران.
کلید واژه: انعکاس ایده آل, فراسطوح, ساختارهای متناوب, قانون اسنل تعمیم‌یافته, سطوح هوشمند قابل تنظیم (RIS), شرایط انتقال صفحه ای تعمیم‌یافته (GSTCs),
چکیده مقاله :
یکی از مهم‌ترین ویژگی‌های فراسطوح، توانایی آنها در کنترل امواج منعکس شده از آنها می‌باشد. اما فراسطوح منعکس‌کننده بر پایه روش ساده گرادیان فاز با بازده کمی همراه هستند، به طوری که بازتاب‌های ناخواسته‌ای در جهات غیرمطلوب به وجود می‌آید. یک تحقیق نظری نشان می‌دهد که یک فراسطح با قابلیت قطبندگی می‌تواند موج را بدون حضور امواج ناخواسته منعکس نماید. برای تبدیل این نظریه به مدل حقیقی، نیاز به تبدیل فراسطح به مدل ریاضی است. در اینجا، این نظریه برای اولین بار با استفاده از یک روش سنتز که اساساً بر مبنای محیط است، به یک مدل ریاضی تبدیل می‌شود. ما تانسورهای حساسیت الکتریکی و مغناطیسی فراسطح را به صورت معادلات ریاضی فرم بسته بدست می‌آوریم و در نتیجه خواهیم دید که این تانسورها نماینده‌ی مدل ریاضی سطحی با ویژگی‌های بدون تلف، غیرفعال، هم‌پاسخ و تک‌ناهمسانگرد هستند. از آنجایی که این مدل اطلاعات کامل‌تری نسبت به سایر روش‌ها ارائه می‌دهد، تبدیل این مدل ریاضی به یک مدل واقعی به شکلی دقیق‌تر انجام خواهد شد. به منظور اثبات صحت فرمول‌های به دست آمده برای این مدل فراسطح، شبیه‌سازی تمام موج آن با استفاده از نرم‌افزار کامسول انجام شده است.
One of the most useful features of metasurfaces is controlling a plane-wave reflection. However, recent research has shown that realizations of anomalously reflecting surfaces based on simple phase-gradient metasurface designs suffer from limited efficiency, where there are always parasitic reflections to undesired directions. Using a circuit-based approach, it has been shown that a polarizer metasurface can achieve reflection without spurious diffraction. Here, such condition is derived using a medium-based—and hence, more insightful—an approach based on generalized sheet transition conditions and surface susceptibility tensors. Thus, we derive the susceptibility tensors of the metasurface in closed-form equations. Moreover, to determine the performance improvement of this metasurface compared to its common examples, the susceptibility parameters of the metasurface based on the Generalized Snell's law are also obtained. Then, full-wave simulations of two surfaces illuminated by perpendicular Gaussian waves are compared. The obtained susceptibility parameters are considered the macroscopic design of the metasurface.
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