مقایسه عملکرد دو آنتن تراهرتز بر پایه ی ساختارهای نوری جهت تشخیص بافت سرطانی
محمد طولابی
1
(
دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران
)
مهدی خطیر
2
(
دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران
)
محمد ناصر مقدسی
3
(
دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران
)
نسرین امیری
4
(
مدیر گروه مخابرات- واحد تهران جنوب
)
الکلمات المفتاحية: آنتن, بلورهای نوری, بازتابنده دندانه ای, تراهرتز, طیف سنجی سرطان, فراسطح,
ملخص المقالة :
این مقاله مقایسه عملکرد بین دو آنتن ویوالدی با پهنای باند وسیع (بیش از 120درصد پهنای باند) در فرکانس 0/5 تا 2 تراهرتز و آنتن متناوب لگاریتمی با یک مشخصه دو باندی در فرکانسهای 1/2 و 1/5 تراهرتز را برای تشخیص سرطان با آرایش جدید ویژه بلورهای نوری ، فراسطح و بازتابنده دندانه ای پیشنهاد میکند. در ساختار ویوالدی دیواره های بلورهای نوری در دو طرف آنتن اجرا می شوند تا یک سپر الکتریکی برای تمرکز انرژی برای افزایش بهره و جهت دهی آنتن و کاهش لوب جانبی ایجاد کنند. نسبت جلو به عقب (F/B) مشکل دیگری برای این آنتن است که در آن از عناصر دندانه ای به عنوان بازتابنده برای کاهش لوب پشتی آنتن استفاده می شود. این آنتن بازه فرکانسی 0/5 تا 2 تراهرتز را با حداکثر بهره 8/8 دسی بل پوشش می دهد. آنتن پیشنهادی برای تشخیص سرطان سینه و پوست که توسط مدل دیبای مرتبه دوم مدلسازی شدهاند، استفاده میشود. در ساختار دوم از یک آنتن دندانه ای متناوب لگاریتمی به عنوان تشعشع کننده و از بلورهای نوری و فراسطح برای افزایش جهت دهی آنتن و کاهش نسبت جلو به عقب استفاده میشود. در این ساختار، فراسطح به شکل دیسک فرکتال طراحی شده است تا ویژگی دو باندی را نیز نشان دهد. حداکثر بهره آنتن به 11/5 دسی بل افزایش یافته و راندمان نزدیک به 90 درصد است. از مقادیر بازتاب و انتقال، پاسخ پالس، و تغییر فاز بافت های سالم و سرطانی برای تشخیص سرطان استفاده می شود.
Utilizing photonic crystals and combining them with a metasurface structure to transform a log-periodic antenna into a strong resonator and employing the structure as a probe.
Introducing a novel configuration of Vivaldi antennas using photonic crystals and a toothed reflector, aiming to provide shielding, reduce sidelobes, and enhance directivity.
Presenting a pattern recognition algorithm to distinguish cancerous tissue from healthy tissue, using the output of antennas to design a data processing system.
Employing directive antennas, metasurfaces, and shielding to generate a directional antenna pattern and detect cancerous tissue.
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