Home » News & Blogs » How is Antenna Efficiency Defined and How Can One Use Measurements of the Sun to Calculate It?
Bookmark and Share
Ask an Astronomer

How is Antenna Efficiency Defined and How Can One Use Measurements of the Sun to Calculate It?

16 May 2018, 17:41 UTC
How is Antenna Efficiency Defined and How Can One Use Measurements of the Sun to Calculate It?
(200 words excerpt, click title or image to see full post)

Question: I am an undergraduate Physics student carry out a research to determine the brightness temperature of the sun at 4 GHz and 12 GHz with offset dishes and prime focus dishes and would like to find out how can one determine the efficiency of a parabolic dish like a C band dish and offset dish like a Ku band dish (dstv dish). other articles mention that the efficiency of a dish lies between 0.6-0.75. Is there a mathematical formula for calculating the efficiency accurately for the individual dishes. the second question is does the sun emit non thermal or thermal radiation at 4 GHz and 12 GHz. if so what are the corresponding brightness temperature at that frequency. is there reference information about brightness temperature of the sun at those specified frequencies that i can refer to when doing my research. Your response will be highly appreciated. — Mukadi
Answer: For information on how radio telescope antenna efficiencies are calculated, let me point you to a resource page which provides a number of Radio Astronomy Tutorials, one of which is a tutorial on Temperature Scales and Telescope Efficiencies. For information on the brightness temperature of the Sun at 4 ...

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod