نوع مقاله : مقالة‌ تحقیقی‌ (پژوهشی‌)

نویسندگان

1 پژوهشکده سامانه های فضانوردی، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران

2 پژوهشکده حقوق، مدیریت و استانداردهای هوافضایی، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران

چکیده

در محیط فضا، نوسانات حرارتی از مهم ترین تهدیدات برای اجزای خارجی سامانه های فضایی، مانند آنتن، محسوب میشود. میزان نوسانات حرارتی تابع مدار فضاپیما و جنس اجزای سامانه است و سبب انبساط و انقباض و اعوجاج سطوح آنتن شده و در عملکرد آن اختلال ایجاد میکنند. در این مقاله، اثرات انبساط و انقباض حرارتی در یک مأموریت مداری LEO بر مشخصات تشعشعی دو آنتن انعکاسی باند X ، که یکی از آنتنها پهن باند و دیگری باند باریک هستند، بررسی شده و مشخصات تشعشعی آنها با استفاده از نرم‌افزار شبیه ساز تمام‌موج استخراج میشود. مقایسه مشخصات تشعشعی این دو آنتن، با مشخصات تشعشعی آنتنهای نمونه معادل در دمای محیط، نشان میدهد که آنتنهای باند باریک آسیب‌پذیری بسیار بالایی نسبت به نوسانات حرارتی دارند و بنابراین، لازم است جنس آنتنها از موادی انتخاب شوند که ضریب انبساط حرارتی آن‌ها بسیار کوچک است. به‌علاوه، انتخاب روش حفاظتی مناسب، برای حفظ عملکرد مطلوب آنتن، از ضروری‌ترین فعالیت‌ها در ساخت آنتنهای فضایی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Thermal Effects of the Space Environment on the Radiation Characteristics of a Reflector Antenna in LEO Spacecrafts

نویسندگان [English]

  • Fatemeh Asdaghpour 1
  • Fatemeh Sadeghikia 1
  • Mohammad Ali Farsi 2

1 Astronautical Systems Research Institute, Aerosapce Sceince and Technology, Ministry of Science, Research and Technology, Tehrant Iran

2 Aerospace Law, Management and Standards Research Institute, Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, Iran

چکیده [English]

Antennas, which are usually installed on the outer shell of these systems, are therefore always exposed to the thermal fluctuations of the space environment. Thermal fluctuations cause the antenna surfaces to expand, contract and distort and can cause the antenna to malfunction. In this paper, the effects of thermal expansion and contraction due to an LEO orbital mission on the radial characteristics of two X-band reflective antennas, one broadband antenna and the other narrowband, And the resulting radiation characteristics are compared with the characteristics of equivalent sample antennas at ambient temperature. Analyses show that narrowband antennas are very vulnerable to thermal fluctuations and, therefore, it is necessary to choose the material of the antennas from materials whose thermal expansion coefficient is very small. In addition, choosing the appropriate protection method to maintain the optimal performance of the antenna is one of the most essential activities in the construction of space antennas.

کلیدواژه‌ها [English]

  • low earth orbit
  • thermal cycling
  • reflector antenna
  • X-band frequency
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