Ko te pūihi poto-rua-waea tētahi o ngā tauira taketake e whakamahia ana i roto i te ariā pūihi. He pūihi waea raina māmā noa iho, he iti ake te roa katoa i te roangaru o te tohu whakahaere. Ahakoa te āhua māmā noa iho o te hanganga, he tauira tohutoro nui te pūihi poto-rua-waea hei mārama ki te tohatoha o te iahiko, te whanonga irahiko, te aukati pūihi, me te whanaungatanga i waenga i te rahi o te pūihi me te roangaru.
I roto i te hangarau pūihi, ka kiia he "poto" te dipole ina iti iho i te kotahi-tekau o te roangaru te roa katoa:
L < \frac{\lambda}{10}
I konei, ko (L) te roa o te arataki dipole, ā, ko (\lambda) te roangaru i te auau whakahaere. E hangai ana tēnei whakamāramatanga ki te roa hiko, kaua ki te awhe auau pumau. Arā, ka taea e te dipole poto te puta i roto i ngā roopu auau rerekē, mena he iti ake tōna roa ā-tinana i te roangaru.
Nā te mea he poto te hiko o te pūihi, he rerekē te tohatoha o te iahiko i te taha o te kaiārahi i tērā o te haurua-ngaru. I roto i te haurua-ngaru mahi, ko te iahiko te nuinga o te wā e tata ana ki te pūwāhi whāngai, ā, ka heke ki ngā pito o te kaiārahi. Nā te mea he poto ake te roa o te kaiārahi i te roangaru, kāore te pūihi e whakamahi pai i tōna rahi ā-tinana mō te irahiko. Nō reira, he iti te ātete irahiko o ngā haurua-ngaru poto, ā, he iti te pai o te irahiko, inā koa ka whakaarohia te ngaronga o te kaiārahi me te ngaronga ōrite.
Ko tētahi tauira ariā e pā ana ko te dipole iti rawa. Ko te dipole iti rawa he pūihi kua whakaritea, he iti ake te roa i te roangaru. He maha ngā wā ka whakaatuhia penei:
[\Delta l \ll \lambda]
I roto i ētahi tauira pūihi kua whakangawaritia, ka taea te whakaaro he tata ōrite te tohatoha iahiko o te pūihi iti rawa. Nā tēnei ka whai hua mō te tātari ariā, ahakoa ehara i te hanganga pūihi mahi tonu. He maha ngā wā ka whakamahia e ngā miihini te pūihi iti rawa hei poraka hanga mō te mārama ki ngā raruraru irahiko pūihi uaua ake.
I roto i ngā hanganga pūihi tūturu, ka taea te whakamahi i ngā pereti utaina kaha, i ngā huānga utaina-runga rānei hei whakapai ake i te tohatoha iahiko, hei whakaiti rānei i te rahi ā-tinana o tētahi pūnaha pūihi. Ka taea e ēnei hanganga utaina te āwhina kia pai ake te whakamahi i tētahi pūihi poto hiko, engari kāore e whakarerekē i te meka taketake he iti ake te whai hua o tētahi pūihi poto i tētahi pūihi orooro pērā i te pūihi haurua-ngaru.
He rite te āhua o te tauira irahiko o tētahi pūrua poto ki te āhua o tētahi pūrua haurua-ngaru. Mēnā ka whakatakotoria te pūrua ki runga, ka tata te ahunga katoa o tōna tauira irahiko i roto i te papa whakapae. I roto i te tirohanga rua-ahu, ka whakaahuahia te tauira hei āhua ahua-waru, me te irahiko mōrahi e poutū ana ki te tuaka o te pūihi, me te irahiko iti rawa i te tuaka o te pūihi.
He mea kōrero whānuitia ngā pūihi poto-rua i roto i ngā pūnaha whiwhi auau-iti me te auau-waenga, ina roa rawa te roanga ngaru, ā, tera pea he nui rawa te hanga o tētahi pūihi e orooro ana. I ēnei wā, ka whakaratohia e te poto-rua he hanganga whiwhi kiato, ahakoa me āta whakaaro ki te taurite aukati me te whai huatanga.
Mai i te tirohanga hangarau, ehara te pūihi poto i te āhua pūihi noa iho. Ka āwhina i te whakamārama he aha te hiranga o te roa o te pūihi, te pānga o te tohatoha iahiko ki te irahiko, me te take e hiahiatia ai he whatunga taurite, he tikanga uta rānei mō ngā pūihi iti hiko. Mō ngā kaihangarau RF me te ngaruiti, ko te mārama ki te pūihi poto he tūāpapa whai hua mō te ako i ngā pūihi mahi, ngā pūihi iti hiko, ngā pūihi ine, me ngā pūnaha pūihi matatau ake.
Mō ētahi atu kōrero mō ngā antenna, tirohia:
Wā tuku: Pipiri-26-2026
