I te upoko o mua, i kōrerohia e tātou ngā tauira irahiko. Hei tātari pai ake i te irahiko pūihi, me whai i tētahi pūwāhi tohutoro. Mā te irahiko o tētahi pūihi isotropic tēnei mahi e whakatutuki.
Whakamāramatanga
Ko te hihi isotropic e pā ana ki te hihi mai i tētahi pūtake pūwāhi e horapa ōrite ana ki ngā ahunga katoa, me te kaha ōrite ahakoa te ahunga ine. Ka arotakehia tonutia te whakapainga o te tauira hihi o te pūihi mā te whakamahi i te hihi isotropic hei tohutoro. Mena he ōrite te hihi i ngā ahunga katoa, ka kiia he hihi isotropic.
•He tauira o te pūwhakaata isotropic te pūtake pūwāhi. Heoi, he mea tino uaua te whakatutuki i taua momo irahiko isotropic, nā te mea ka tukuna e tetahi pūihi tōna pūngao me te ahunga tika.
•He rite tonu te irahiko isotropic ki te irahiko omnidirectional.
•Ina tirohia i te 3D, he rite tōna tauira ki te āhua o te tōnati; ina tirohia i te 2D, he rite tōna tauira ki te āhua o te waru.
E whakaatu ana te ahua i runga ake nei i te tauira irahiko o tētahi pūwhakamahana isotropic (omnidirectional rānei). E whakaatu ana te ahua 1 i te tauira āhua-tōnati i te 3D, ko te ahua 2 ia e whakaatu ana i te tauira ahua-waru i te 2D.
Whiwhi
He kotahi te whakanui o te pūwhakamahana isotropic, arā, ko te tauwehe whakanui he 1 i ngā taha katoa. Ina whakaaturia i roto i ngā desipere (dB), ka kiia tēnei he whakanui 0 dB (kore ngaronga).
Mana Whakapāho Isotropika Rite (EIRP)
E ai ki te whakamāramatanga paerewa, ko te nui o te mana e tukuna ana e te pūihi isotropic hei whakaputa i te kiato mana tihi e kitea ana i te ahunga o te whakanui pūihi mōrahi ka kiia ko te Mana Irahiko Isotropically Equivalent.
Ina kukū te kaha irahiko o te pūihi ki tētahi taha, ki tētahi ahunga rānei, ā, he ōrite te irahiko i taua ahunga ki te mana irahiko isotropic o te pūihi, ka kiia tēnei irahiko ko te EIRP.
Whiwhi
Ahakoa he whakaaro noa iho te irahiko isotropic, koinei te irahiko pai rawa atu ka taea e te pūihi te whakatutuki. Ko te whakanui o taua pūihi he 3 dBi, ko te 3 dB e rite ana ki te tauwehenga o te 2, ā, ko te "i" e tohu ana i te tauwehenga e pā ana ki te āhua isotropic.
Mena ka arotahihia te hihi ki roto i tētahi koki, ka piki ake te EIRP me te whakanui i te pūihi. Ko te huarahi pai ki te whakatutuki i te whakanui i te pūihi ko te whakaemi i tōna hihi ki te taha kotahi.
Mana Whakapāho Whai Hua (ERP)
Mena ka tatauhia te mana i whakapūtāhia mā te whakamahi i tētahi pūihi haurua-ngaru rua, kaua ki tētahi pūihi isotropic, ka kiia ko te Mana Whakapūtāhia Whai Hua (ERP).
ERP(dBW)=EIRP(dBW)−2.15 dBi
Mena e mōhiotia ana te EIRP, ka taea te tatau i te ERP mā te whakamahi i te tātai i hoatu i runga ake nei.
Mō ētahi atu kōrero mō ngā antenna, tirohia:
Wā tuku: 17 Paenga-whāwhā 2026
