อ้างอิง
Antenna Theory - Loop (tutorialspoint.com)
Antenna Fundamentals | McGraw-Hill Education - Access Engineering (accessengineeringlibrary.com)
https://www.youtube.com/watch?v=ZaXm6wau-jc
https://www.youtube.com/watch?v=Fu-aYnRkUgg
https://www.youtube.com/watch?v=Q0qrU4nprB0
https://www.youtube.com/watch?v=dU0q_nYd-CM
https://www.youtube.com/channel/UCuh_ss4w2OAMz5i9UM5zucQ/videos
https://www.youtube.com/channel/UCVLbzhxVTiTLiVKeGV7WEBg/videos