ʻElua Polarized Horn Antenna 20dBi Typ.Loaʻa, 10.5-14.5GHz Laulā alapinepine

ʻO ka laina hoʻolaha o ka nalu ultrashort a me ka microwave

ʻO nā hawewe ultrashort, ʻoi aku ka nui o nā microwaves, he mau alapine kiʻekiʻe a me nā lōʻihi hawewe pōkole, a hoʻemi koke ko lākou mau nalu ʻili honua, no laila ʻaʻole hiki iā lākou ke hilinaʻi i nā nalu ʻili honua no ka hoʻolaha lōʻihi.

ʻO nā nalu ultrashort, ʻoi aku ka nui o nā microwaves, hoʻolaha nui ʻia e nā nalu ākea.ʻO ka ʻōlelo maʻalahi, ʻo ka nalu ākea ka nalu e hoʻolaha ana ma kahi laina pololei i loko o ke ākea.ʻIke loa, ma muli o ka curvature o ka honua, aia kahi palena laina-o-sight mamao Rmax no ka hoʻolaha ʻana o ka nalu.ʻO ka wahi i loko o ka mamao ʻike pololei loa i kapa ʻia ʻo ka wahi kukui;kapa ʻia ka ʻāpana ma waho o ka palena ʻike maka pololei ʻo Rmax ka ʻāpana aka.Ke hele nei me ka ʻōlelo ʻole ʻana i ka wā e hoʻohana ai i ka nalu ultrashort a me ka microwave no ke kamaʻilio ʻana, e hāʻule ka wahi e loaʻa ai i loko o ka palena laina-o-ʻike mamao Rmax o ka antenna hoʻouna.

Hoʻopili ʻia e ka radius o ka curvature o ka honua, ʻo ka pilina ma waena o ka palena laina-o-sight mamao Rmax a me ke kiʻekiʻe HT a me HR o ka antenna hoʻouna a me ka loaʻa ʻana o ka antenna: Rmax＝3.57{ √HT (m) +√HR ( m) } (km)

Ma ka noʻonoʻo ʻana i ka hopena refraction o ka lewa ma nā hawewe lekiō, pono e hoʻoponopono ʻia ka palena palena o ka mamao o ka ʻike maka i Rmax = 4.12{√HT (m) +√HR (m)}(km) No ka mea he nui ka alapine o nā hawewe electromagnetic. haʻahaʻa ma mua o nā nalu māmā, ka hoʻolaha pono ʻana o nā hawewe lekiō ʻO ka mamao nānā pololei ʻo Re ma kahi o 70% o ka palena mamao nānā pololei ʻo Rmax, ʻo ia hoʻi, Re = 0.7 Rmax.

No ka laʻana, ʻo HT a me HR he 49 m a me 1.7 m pākahi, a laila ʻo ka mamao o ka laina ʻike pono ʻo Re = 24 km.