Ka tapahia, ka pikohia te pūihi rua-waea hei whakatutuki i te irahiko whai hua. Ko te roa katoa o te waea e whakamahia ana hei rua-waea he rite ki te haurua o te roanga ngaru (arā, l=λ/2). Ka kiia tēnei momo pūihi he pūihi rua-waea haurua-ngaru. Nā ōna painga, koinei te pūihi e whakamahia whānuitia ana, ā, e mōhiotia ana hoki ko te pūihi Hertz.
Awhe Auautanga
Ka mahi te pūihi haurua-ngaru rua i runga i te awhe auau o te 3 kHz ki te 300 GHz, ā, e whakamahia nuitia ana i roto i ngā kaiwhiwhi reo irirangi.
Hanganga me te Mātāpono Whakahaere o te Dipole Haurua-Ngaru
He pūihi dipole taketake tēnei, ko tōna auau mahi e rite ana ki te haurua o te roanga ngaru; nō reira, e kiia ana ko te pūihi dipole haurua-ngaru.
Ko ngā pito o te dipole he iahiko mōrahi, he iahiko tauutuutu (AC) te āhua. I te tihi pai o te ngaohiko, ka neke ngā irahiko ki te taha kotahi, i te tihi kino ia, ka neke ki te taha kē. Ka taea tēnei te whakamārama mā te āwhina o te ahua i raro nei.
E whakaatu ana te pikitia i runga ake nei i te mātāpono whakahaere o te dipole haurua-ngaru.
E whakaatu ana te Pikitia 1 i te dipole ina kei roto i te haurua-huringa pai o te ngaohiko whakaoho. I tēnei wā, ka neke ngā irahiko ki te utu pai.
E whakaatu ana te Pikitia 2 i te pūrua i roto i te haurua-huringa kino o te ngaohiko whakaoho. I konei, ka neke atu ngā irahiko i te pūrua.
E whakaatu ana te Pikitia 3 i te dipole i te haurua-huringa pai e whai ake nei. I tēnei wā, ka neke anō ngā irahiko ki te utu.
Ka puta he āpure hiko rerekē i tēnei pānga whakakotahi, e whiti ana ki waho i te tauira kotahi i puta i runga i te pūrua. Nō reira, ko te putanga o te pūihi he hihi whai hua e whai ana i te tauira ā-wā o te ngaohiko putanga. Mā tēnei, ka tutuki i te pūrua haurua-ngaru te hihi whai hua.
E whakaatu ana te ahua i runga ake nei i te tohatoha o te iahiko i roto i te haurua-ngaru. Ko te pikinga o te haurua-ngaru he 2.15 dBi, he tino pai. I konei, ko te reta "i" e pā ana ki te radiator isotropic.
Aratau irahiko
He whānui te ahunga o te tauira irahiko o tēnei pūihi haurua-ngaru rua i roto i te papa-H, ā, he pai mō te whānuitanga o ngā tono pēnei i te whakawhitiwhiti kōrero pūkoro me te whiwhinga reo irirangi.
E whakaatu ana te pikitia i runga ake nei i ngā tauira irahiko o te rua-ngaru-haurua i te papa-H me te papa-V.
Mō te dipole he roa te haurua o te roangaru (arā, te roa tuatahi o te orooro), kāore tōna radius e pā ki te aukati whakauru. Ka mahi te pūihi i te tino whai hua i tōna auau orooro, e puta ana i tōna roa orooro.
Mō ētahi atu kōrero mō ngā antenna, tirohia:
Wā tuku: Pipiri-05-2026
