Whai muri i te matapakinga o ngā tawhā pūihi taketake i te upoko o mua, ko tētahi atu kaupapa nui hei whakaaroaro ko ngā rohe tata-papa me ngā rohe tawhiti-papa o te pūihi.
He rerekē te kaha o te hihi e inehia ana i te taha tata o te pūihi i tērā i inehia i tawhiti. Ahakoa kei tawhiti te rohe tawhiti i te pūihi, e kiia tonu ana he rohe tika nā te mea he teitei tonu te kaha o te hihi.
Rohe Tata-Papa
Ko te rohe e karapoti tonu ana i te pūihi e kiia ana ko te rohe tata-papa. Ko ngā pānga whakaaweawe te mea nui o tēnei rohe, nō reira e kiia ana hoki ko te rohe whakaaweawe, ahakoa kei roto tonu ētahi wāhanga hihi.
Rohe Papa-Tawhiti
Ko te rohe e tawhiti atu ana i te pūihi e kiia ana ko te rohe mara-tawhiti. E mōhiotia ana hoki ko te rohe mara irahiko, nā te mea ko ngā pānga irahiko te mea nui i konei. He maha ngā tawhā matua o te pūihi, pērā i te aronga me te tauira irahiko, kua tautuhia, kua inehia hoki i roto i tēnei rohe.
Tauira Mara
Ka taea te ine i te tohatoha o te mara mā te kaha o te mara, ā, ko te whakaaturanga whakairoiro ka puta ko te tauira mara. Ina koa, ina whakaatuhia te mana irahiko o te pūihi i runga i te kaha o te mara hiko E (V/m), ka kiia te kauwhata hua ko te tauira mara. Mena ka inehia i runga i te mana (W), ka kiia ko te tauira mana.
Ko te tohatoha whakairoiro o te mara irahiko, o te mana rānei, e whakawhirinaki ana ki:
•I te rohe tawhiti-papa, i ngā koki ā-wāhi anake (θ,ϕ);
•I te rohe tata-papa, i ngā koki ā-wāhi (θ,ϕ) me te tawhiti radial (r).
Ka taea te mārama ake i ngā āhuatanga o ngā rohe papa-tata me ngā papa-tawhiti mā te awhina o ngā whakaaturanga whakairoiro.
Ka taea te whakarōpū i ngā tauira mara penei:
•Rohe Papa Tata Tauhohe me te Rohe Papa Tata Hāmama — e rua e kīia ana ko te rohe papa tata.
•Rohe Papa-Tawhiti e Hikoi Ana — e kiia noa ana ko te rohe papa-tawhiti.
Ko te rohe e karapoti tonu ana i te pūihi ko te rohe tata-papa tauhohe, e mōhiotia ana ko te rohe kore-papa irahiko, kāore e tino kaha ngā pānga irahiko. Kei te taha tonu o tēnei ko te rohe tata-papa e irahiko ana, e kiia ana ko te rohe Fresnel, ka tino kaha te irahiko, ā, ka whakawhirinaki te tohatoha o te mara koki ki te tawhiti ā-tinana mai i te pūihi.
Kei tua atu i tēnei ko te rohe hihi tawhiti e whiti ana. I tēnei rohe, kāore te tohatoha o te hihi e pā ana ki te tawhiti, ā, kua whakatūria te tauira hihi whai hua.
Mō ētahi atu kōrero mō ngā antenna, tirohia:
Wā tuku: Paenga-whāwhā-01-2026
