Ko tētahi tawhā whai hua hei tatau i te mana whiwhi o te pūihi ko terohe whai huarāneipūaha whai hua. Me kī he ngaru papatahi me te porowhitatanga rite ki te pūihi whiwhi e pā ana ki te pūihi. Me kī anō hoki kei te haere te ngaru ki te pūihi i te ahunga o te hihi mōrahi o te pūihi (te ahunga e whiwhi ai te mana nui rawa atu).

Kātahi kapūaha whai huae whakaahua ana te tawhā i te nui o te mana ka hopukina mai i tētahi ngaru papatahi kua hoatu. Me waiho mā tepko te mātotoru mana o te ngaru papa (i roto i te W/m^2). MenaP_te tohu ana i te mana (i roto i ngā Watts) i ngā pito pūihi e wātea ana ki te kaiwhiwhi o te pūihi, kātahi:

Nō reira, ko te horahanga whai hua e tohu ana i te nui o te mana e hopukina ana mai i te ngaru rererangi ka tukuna e te pūihi. Ka whai wāhi tēnei horahanga ki ngā mate o roto o te pūihi (ngā mate ohmic, ngā mate dielectric, me ētahi atu).

Ko te whanaungatanga whānui mō te kōhao whai hua e pā ana ki te pikinga pūihi tihi (G) o tētahi pūihi ka hoatuhia e:

Ka taea te ine i te pūaha whai hua, te horahanga whai hua rānei i runga i ngā pūihi tūturu mā te whakataurite ki tētahi pūihi e mōhiotia ana me tētahi pūaha whai hua kua hoatu, mā te tatau rānei mā te whakamahi i te whakanui i inehia me te whārite i runga ake nei.

He ariā whai hua te whakatuwheratanga whai hua mō te tatau i te mana i whiwhi mai i te ngaru papatahi. Hei tiro i tēnei mahi, haere ki te wāhanga e whai ake nei mō te tātai tuku Friis.

Te Whārite Whakawhiti Friis

I tēnei whārangi, ka whakaatuhia e mātou tētahi o ngā whārite tino taketake o te ariā pūihi, arā, teWhārite Tuku Friis. Ka whakamahia te Whārite Tuku Friis hei tatau i te mana i whiwhi mai i te pūihi kotahi (me te whakanuiG1), ina tukuna mai i tētahi atu pūihi (me te whakanuiG2), wehea ana e te tawhitiR, me te mahi i te auaufte roangaru lambda rānei. He mea tika kia pānuihia tēnei whārangi kia rua, ā, me mārama katoa.

Te Putanga o te Friis Transmission Formula

Hei tīmatanga i te whakaputa i te Whārite Friis, whakaarohia kia rua ngā pūihi i te wāhi wātea (kāore he arai e tata ana) e wehea ana e te tawhiti.R:

Me kī ko （）Ngā Watts o te mana katoa ka tukuna ki te pūihi tuku. Mō nāianei, me kī ko te pūihi tuku he ahunga katoa, kāore he ngaronga, ā, kei roto te pūihi whiwhi i te mara tawhiti o te pūihi tuku. Kātahi kap(i roto i ngā Watts ia mita pūrua) o te ngaru rererangi e pā ana ki te pūihi whiwhi i te tawhitiRmai i te pūihi tuku ka homai e:

Pikitia 1. Ngā Antenna Tuku (Tx) me Whiwhi (Rx) i wehea eR.

Mena he pikinga pūihi kei te ahunga o te pūihi tuku i homai e （） , ka noho te whārite kiato mana i runga ake nei:

Ko te kupu whakanui ka pā ki te ahunga me ngā ngaronga o te pūihi tūturu. Me kī inaianei he kōhao whai hua tō te pūihi whiwhi e homai ana e(). Kātahi ka hoatu te mana e whiwhihia ana e tēnei pūihi ( ) e:

I te mea ka taea hoki te whakaatu i te pūaha whai hua mō tētahi pūihi penei:

Ka taea te tuhi i te mana i whiwhihia penei:

Whārite1

E mōhiotia ana tēnei ko te Friis Transmission Formula. E hono ana i te ngaronga ara mokowā kore utu, ngā pikinga pūihi me te roanga ngaru ki ngā mana whiwhi me te tuku. Ko tētahi tēnei o ngā whārite taketake i roto i te ariā pūihi, ā, me maumahara (me te pūtake i runga ake nei).

Kei te Whārite [2] tētahi atu momo whai hua o te Whārite Tuku Friis. Nā te mea e pā ana te roangaru me te auau f ki te tere o te mārama c (tirohia te kupu whakataki ki te whārangi auau), kei a tātou te Tātai Tuku Friis e pā ana ki te auau:

Whārite2

E whakaatu ana te Whārite [2] he nui ake te mana e ngaro ana i ngā auau teitei ake. He hua matua tēnei o te Whārite Tuku Friis. Ko te tikanga, mō ngā pūihi me ngā whiwhinga kua tohua, ka teitei rawa te whakawhiti pūngao i ngā auau iti ake. Ko te rerekētanga i waenga i te mana i whiwhi me te mana i tukuna ka mōhiotia ko te ngaronga ara. I tētahi atu huarahi, e kī ana te Whārite Tuku Friis he teitei ake te ngaronga ara mō ngā auau teitei ake. Kāore e taea te whakanui rawa i te hiranga o tēnei hua mai i te Tātai Tuku Friis. Koinei te take e mahi ai ngā waea pūkoro i raro iho i te 2 GHz. Tērā pea he nui ake ngā whānuitanga auau e wātea ana i ngā auau teitei ake, engari kāore te ngaronga ara e pā ana e āhei ai te whiwhi kounga. Hei hua anō o te Whārite Tuku Friss, me kī ka pātaihia koe mō ngā pūihi 60 GHz. Me te mōhio he tino teitei tēnei auau, ka taea e koe te kī he tino teitei rawa te ngaronga ara mō te whakawhitiwhiti tawhiti - ā, he tino tika koe. I ngā auau tino teitei (e kiia ana te 60 GHz ko te rohe mm (ngaru mirimita) i ētahi wā), he tino teitei te ngaronga ara, nō reira ko te whakawhitiwhiti tohu-ki-tohu anake ka taea. Ka puta tēnei ina noho te kaiwhiwhi me te tuku i roto i te rūma kotahi, ā, e anga atu ana tetahi ki tetahi. Hei tāpiritanga atu ki te Friis Transmission Formula, ki tō whakaaro kei te harikoa ngā kaiwhakahaere waea pūkoro mō te roopu LTE hou (4G), e mahi ana i te 700MHz? Ko te whakautu he āe: he iti ake te auau o tēnei i ngā pūihi e mahi ana i ngā wā o mua, engari mai i te Whārite [2], ka kite mātou ka iti ake te ngaronga o te ara. Nō reira, ka taea e rātou te "kapi atu i te whenua" me tēnei whānuitanga auau, ā, i karangatia tata nei tēnei e tētahi kaiwhakahaere Verizon Wireless he "whānui kounga teitei", mō tēnei take tonu. Tuhipoka taha: I tētahi atu taha, me whakauru e ngā kaihanga waea pūkoro he pūihi he roangaru nui ake ki roto i tētahi taputapu kiato (auau iti = roangaru nui ake), nō reira kua uaua ake te mahi a te kaihoahoa pūihi!

Hei whakamutunga, ki te kore ngā pūihi e ōrite te pōraritanga, ka taea te whakarea i te mana i whiwhihia i runga ake nei e te Pōraritanga Ngaronga (PLF) hei whakamārama tika i tēnei taupatupatu. Ka taea te whakarerekē i te whārite [2] i runga ake nei hei whakaputa i tētahi Tātai Tuku Friis whānui, e whakauru ana i te taupatupatu pōraritanga: