Ko te whai huatanga o tētahipūihie pā ana ki te kaha o te pūihi ki te huri i te pūngao hiko whakauru ki te pūngao irahiko. I roto i ngā whakawhitiwhiti kōrero ahokore, he pānga nui te whai huatanga o te pūihi ki te kounga tuku tohu me te whakapaunga hiko.
Ka taea te whakaatu i te whai huatanga o te pūihi mā te tātai e whai ake nei:
Whai hua = (Mana iraira / Mana tāuru) * 100%
I roto i ēnei, ko te mana irahiko ko te pūngao hikohiko e tukuna ana e te pūihi, ā, ko te mana tāuru ko te pūngao hiko e tāuru ana ki te pūihi.
He maha ngā āhuatanga e pāngia ana te whai huatanga o te pūihi, tae atu ki te hoahoa o te pūihi, te rauemi, te rahi, te auau whakahaere, me ētahi atu. I te nuinga o te wā, ko te teitei ake o te whai huatanga o te pūihi, ko te nui ake o te whai huatanga o tana huri i te pūngao hiko whakauru ki te pūngao irahiko, ā, ka whakapai ake i te kounga o te tuku tohu me te whakaiti i te whakapaunga hiko.
Nō reira, he mea nui te whai huatanga hei whakaaroaro i te wā e hoahoa ana, e tīpako ana rānei i ngā pūihi, inā koa i ngā tono e hiahia ana ki te tuku tawhiti, he tino whakaritenga rānei mō te whakapaunga hiko.
1. Te whai huatanga o te pūihi
Pikitia 1
Ka taea te tautuhi i te ariā o te whai huatanga o te pūihi mā te whakamahi i te Pikitia 1.
Ka whakamahia te tapeke o te whai huatanga o te pūihi e0 hei tatau i ngā ngaronga pūihi i te whakaurunga me roto i te hanganga pūihi. E pā ana ki te Pikitia 1(b), ko ēnei ngaronga pea nā:
1. Ngā whakaata nā te kore ōrite o te raina tuku me te pūihi;
2. Ngā mate o te arataki me te mate hiko.
Ka taea te whiwhi i te whai huatanga katoa o te pūihi mai i te tātai e whai ake nei:
Arā, ko te pai o te katoa = te hua o te pai o te kore taurite, te pai o te ara iahiko me te pai o te uruhanga hiko.
He tino uaua te tatau i te pai o te ara iahiko me te pai o te uruhanga hiko, engari ka taea te whakatau mā roto i ngā whakamātautau. Heoi, kāore e taea e ngā whakamātautau te wehewehe i ngā ngaronga e rua, nō reira ka taea te tuhi anō i te tātai i runga ake nei:
Ko te ecd te whai huatanga o te irahiko o te pūihi, ā, ko te Γ te tauwehenga whakaata.
2. Te Hua me te Hua i Whakatutukihia
Ko tētahi atu inenga whai hua mō te whakaahua i te mahi a te pūihi ko te whakanui. Ahakoa he hononga tata te whakanui o te pūihi ki te ahunga, he tawhā e whai whakaaro ana ki te whai huatanga me te ahunga o te pūihi. Ko te ahunga he tawhā e whakaahua ana i ngā āhuatanga ahunga o te pūihi anake, nō reira ka whakatauhia e te tauira irahiko anake.
Ko te whakanui o te pūihi i tētahi ahunga kua tohua ka tautuhia ko "4π te whakarea o te ōwehenga o te kaha o te hihi i taua ahunga ki te mana whakauru katoa." Mēnā kāore he ahunga kua tohua, ko te whakanui i te ahunga o te hihi mōrahi ka tangohia i te nuinga o te wā. Nō reira, ko te tikanga:
I te nuinga o te wā, e pā ana ki te whakanui whanaunga, e whakamāramahia ana ko "te ōwehenga o te whakanui mana i roto i tētahi ahunga kua tohua ki te mana o tētahi pūihi tohutoro i roto i tētahi ahunga tohutoro". Me ōrite te mana whakauru ki tēnei pūihi. Ka taea te whakamahi i tētahi wiri, i tētahi haona, i tētahi atu pūihi rānei hei pūihi tohutoro. I te nuinga o te wā, ka whakamahia he pūtake pūwāhi kore-aronga hei pūihi tohutoro. Nō reira:
Ko te whanaungatanga i waenga i te mana katoa i whakapūatatia me te mana katoa i whakaurua koia tēnei:
E ai ki te paerewa IEEE, "Kāore te whiwhinga e uru ki ngā ngaronga nā te kore ōrite o te aukati (ngaronga whakaata) me te kore ōrite o te polarization (ngaronga)." E rua ngā ariā whiwhinga, ko tētahi e kiia ana ko te whiwhinga (G) me tētahi e kiia ana ko te whiwhinga ka taea te whakatutuki (Gre), e whai whakaaro ana ki ngā ngaronga whakaata/kore ōrite.
Ko te whanaungatanga i waenga i te whiwhinga me te aronga:
Mena he tino ōrite te pūihi ki te raina tuku, arā, he ōrite te aukati tāuru pūihi Zin ki te aukati āhuatanga Zc o te raina (|Γ| = 0), kāti he ōrite te whakanui me te whakanui ka taea (Gre = G).
Mō ētahi atu kōrero mō ngā antenna, tirohia:
Wā tuku: Pipiri-14-2024
