کاهش ابعاد آنتن هلیکال برای مأموریت های فضایی

نوع مقاله: مقالة‌ تحقیقی‌ (پژوهشی‌)

نویسندگان

پژوهشگاه هوافضا

چکیده

هدف از این پژوهش، بررسی اثرات قطر صفحه زمین آنتن هلیکال مود محوری بر مشخصات تشعشعی آنتن است. بررسی­ها نشان می­دهند که انتخاب مناسب نسبت قطر صفحه زمین نسبت به قطر هلیکس می­تواند مصالحه­ای منطقی میان عملکرد مطلوب آنتن و جرم آن برقرار نماید. تحلیل­های عددی نشان می­دهند که این نسبت برابر با 5/1 است. نتایج این پژوهش نشان می­دهند که با افزایش این نسبت، جرم آنتن افزایش چشمگیری خواهد داشت؛ حال­آنکه در عملکرد آن بهبود قابل ملاحظه­ای ایجاد نمی­شود. براساس نتایج حاصل از شبیه­سازی، نسبت معرفی شده در این پژوهش، مستقل از تعداد دورهای هلیکس است. پس از استخراج نتایج اندازه­گیری شده از نمونه­های ساخته شده در اتاق آنتن، مشاهده شد که انطباق قابل توجهی میان این نتایج با نتایج حاصل از شبیه­ سازی وجود دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Low-Profile Helical Antenna for Space Application

نویسندگان [English]

  • Fatemeh Sadeghikia
  • Ali Karami Horestani
ARI
چکیده [English]

The aim of this study is to examine the effects of diameter of ground conductor in an axial mode helical antenna on some of the characteristics of the antenna. It is shown that a proper ratio of diameter of ground plane to diameter of helix can be chosen to make a trade-off between the performance of helical antenna and its mass budget. It is shown through computational analysis that this optimum ratio is about 1.5. The results show that an increase in this ratio increases the mass budget, but it does not improve the antenna performance significantly. The simulation results also indicatethat this ratio is independent of the number of helix turns. After measurement, it was found that the simulation results of the antenna well agreed with its measured results acquired at the anechoic chamber.

کلیدواژه‌ها [English]

  • Axial mode helical antenna؛ Gain؛ Ground plane dimension
  • Space application

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