طراحی و شبیه‌سازی آنتن شیپوری ESIW صفحه H با بهره بالا و پهنای باند بهبودیافته
محورهای موضوعی : مهندسی برق و کامپیوتر
سید حسین حقیرالسادات
1
,
محمدحسن نشاطي
2
1 - دانشگاه فردوسی،گروه مهندسی برق
2 - دانشگاه فردوسی مشهد،گروه مهندسی برق
کلید واژه: آنتن شیپوری, موجبر مجتمع‌شده در زیرلایه, شكاف تشعشعی, شکاف غیر تشعشعی, صفحه بازتابنده,
چکیده مقاله :
در این مقاله با استفاده از شکاف تشعشعی، الگوی تابشی آنتن شیپوری SIW صفحه H با کاهش پهنای پرتو نیم‌توان در صفحه E بهبود یافته است. این شکاف‌ها می‌توانند علاوه بر حفظ ابعاد ساختار، تأثیر بسزایی بر روی مشخصات آنتن داشته باشند. قرارگرفتن صفحه بازتابنده در فواصل مناسبی از دهانه و شکاف‌ها نیز منجر به بهبود سطح پرتوهای فرعی و تشعشع آنتن در جهت معکوس می‌شود. سپس برای بهبود تطبیق امپدانس و افزایش پهنای باند امپدانسی آنتن، دی‌الکتریک ساختار به طور کامل حذف گردیده و شکاف‌های غیر تشعشعی در صفحه‌های بالا و پایین به آنتن اضافه می‌شوند. حذف عایق باعث افزایش پهنای باند آنتن نسبت به پهنای باند آنتن معمولی شیپوری SIW شده و اضافه‌کردن شکاف‌های تشعشعی، بهره آنتن را نیز بهبود قابل ملاحظه‌ای می‌دهد. نتایج حاصل از شبیه‌سازی نشان می‌دهند که آنتن پیشنهادی این مقاله، محدوده فرکانسی GHz 2/27 تا GHz 3/28 را پوشش داده و بهره آن نیز در این بازه بین dBi 1/10 تا dBi 3/15 با بازده تشعشعی 98% تغییر می‌کند. در انتها به منظور افزایش بهره آنتن، یک آرایه دوبعدی از آنتن پیشنهادی در صفحه H با ساختار تغذیه مناسب طراحی شده است.
In this paper by using the radiation slots, the half power beam width (HPBW) of the SIW horn antenna is reduced in E-plane and the radiation pattern is improved. In addition to keeping the dimensions of the structure constant, these slots can have a significant effect on the characteristics of the antenna. Also placing the reflector plate at a suitable distance from aperture and slots leads to improve side lobe levels (SLLs) and front to back ration (FTBR). Then, to improve the impedance matching and increase the bandwidth of the antenna, the dielectric of the structure is completely removed and non-radiation slots added to the upper and lower plate of the antenna. Removing the insulation, increasing the bandwidth of the antenna compared to a conventional SIW horn and adding radiation slots significantly improves the gain of the antenna. The simulation results shows that the proposed antenna in this paper covers the frequency range of 27.2 GHz to 28.3 GHz and its gain changes between 10.1 dBi to 15.3 dBi with 98% radiation efficiency in this range. Finally, in order to increase the gain of the antenna, a two-dimensional array of the proposed antenna with suitable feeding structure is designed in the H-plane.
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