ʻO ka antenna log-periodic he antenna ākea nona ke kumu hana e pili ana i ka resonance a me ka log-periodic structure. E hoʻolauna pū kēia ʻatikala iā ʻoe i nā antenna log-periodic mai ʻekolu mau ʻano: ka mōʻaukala, ke kumu hana a me nā pono o nā antenna log-periodic.

ʻO ka mōʻaukala o nā antennas log-periodic

ʻO ka antenna log-periodic kahi antenna ākea nona ka hoʻolālā e pili ana i ka hoʻonohonoho log-periodic. Ua hoʻi ka mōʻaukala o nā antenna log-periodic i ka makahiki 1950.

Ua hana mua ʻia ke antenna log-periodic i ka makahiki 1957 e nā ʻenekinia ʻAmelika ʻo Dwight Isbell lāua ʻo Raymond DuHamel. I ka wā e hana ana i ka noiʻi ma Bell Labs, ua hoʻolālā lākou i kahi antenna broadband i hiki ke uhi i nā alapine he nui. Hoʻohana kēia ʻano antenna i kahi geometry log-periodic, e hāʻawi ana iā ia i nā ʻano radiation like ma luna o ka laulā alapine holoʻokoʻa.

I nā makahiki i hala iho nei, ua hoʻohana nui ʻia a ua aʻo ʻia nā antenna log-periodic. Hoʻohana ʻia lākou ma nā wahi e like me ke kamaʻilio uea ʻole, ka hoʻokipa kīwī a me ka lekiō, nā ʻōnaehana radar, nā ana lekiō, a me ka noiʻi ʻepekema. ʻO nā ʻano ākea o nā antenna log-periodic e hiki ai iā lākou ke uhi i nā hui alapine he nui, e hōʻemi ana i ka pono no ka hoʻololi alapine a me ka hoʻololi antenna, a me ka hoʻomaikaʻi ʻana i ka maʻalahi a me ka pono o ka ʻōnaehana.

Hoʻokumu ʻia ke kumumanaʻo hana o ka antenna log-periodic ma kona ʻano kūikawā. Loaʻa iā ia kahi moʻo o nā papa metala e hoʻololi ana, e hoʻonui ana kēlā me kēia i ka lōʻihi a me ka mamao e like me kahi wā logarithmic. ʻO kēia ʻano hana ke kumu o ka antenna e hana i nā ʻokoʻa pae ma nā alapine like ʻole, no laila e hoʻokō ai i ka radiation wide-band.

I ka holomua ʻana o ka ʻenehana, ua holomua nā ʻano hoʻolālā a me ka hana ʻana o nā antenna log-periodic. Hoʻohana nā antenna log-periodic hou i nā mea holomua a me nā kaʻina hana e hoʻomaikaʻi i ka hana antenna a me ka hilinaʻi.

Hiki ke wehewehe pōkole ʻia kona ʻano hana penei

1. Kumumanaʻo Resonance: Hoʻokumu ʻia ka hoʻolālā ʻana o ka antenna log-periodic ma ke kumumanaʻo resonance. Ma kahi alapine kikoʻī, e hana ke ʻano o ka antenna i kahi loop resonant, e ʻae ana i ka antenna e loaʻa a hoʻokuʻu i nā nalu electromagnetic. Ma ka hoʻolālā pololei ʻana i ka lōʻihi a me ka mamao o nā pepa metala, hiki i nā antenna log-periodic ke hana ma nā ʻano alapine resonant he nui.

2. ʻOkoʻa pae: ʻO ka lakio log-periodic o ka lōʻihi o ka ʻāpana metala a me ka mamao o ka antenna log-periodic ke kumu o kēlā me kēia ʻāpana metala e hana i kahi ʻokoʻa pae ma nā alapine like ʻole. ʻO kēia ʻokoʻa pae e alakaʻi ai i ke ʻano resonant o ka antenna ma nā alapine like ʻole, no laila e hiki ai ke hana ākea. Hana nā ʻāpana metala pōkole ma nā alapine kiʻekiʻe, ʻoiai hana nā ʻāpana metala lōʻihi ma nā alapine haʻahaʻa.

3. Ke nānā ʻana i ke kukuna: ʻO ke ʻano o ka antenna log-periodic e loaʻa iā ia nā ʻano radiation like ʻole ma nā alapine like ʻole. Ke loli ke alapine, loli pū ke kuhikuhi radiation a me ka laulā o ke kukuna o ka antenna. ʻO ia hoʻi, hiki i nā antenna log-periodic ke scan a hoʻoponopono i nā kukuna ma luna o kahi alapine ākea.

Nā pono o nā antennas log-periodic

1. Nā ʻano Broadband: ʻO ka antenna log-periodic kahi antenna wide-band hiki ke uhi i nā hui alapine he nui. ʻO kona ʻano log-periodic e hiki ai i ka antenna ke loaʻa nā ʻano radiation like ma ka laulā alapine holoʻokoʻa, e hoʻopau ana i ka pono no ka hoʻololi alapine a i ʻole ka hoʻololi antenna, e hoʻomaikaʻi ana i ka maʻalahi o ka ʻōnaehana a me ka pono.

2. Loaʻa kiʻekiʻe a me ka pono o ka radiation: ʻO ka maʻamau, loaʻa i nā antennas log-periodic ka loaʻa kiʻekiʻe a me ka pono o ka radiation. ʻO kona ʻano e ʻae i ka resonance i nā pae alapine he nui, e hāʻawi ana i nā hiki ke hoʻomālamalama a me ka loaʻa ʻana o ka radiation ikaika.

3. Kaohi ʻana i ke kuhikuhi ʻana: ʻO nā antennas log-periodic he kuhikuhi maʻamau, ʻo ia hoʻi, he ikaika ko lākou i ka radiation a i ʻole ka hiki ke hoʻokipa i kekahi mau kuhikuhi. ʻO kēia ka mea e kūpono ai nā antennas log-periodic no nā noi e pono ai ke kuhikuhi ʻana i ka radiation kikoʻī, e like me ke kamaʻilio ʻana, ka radar, a pēlā aku.

4. Hoʻomaʻalahi i ka hoʻolālā ʻōnaehana: ʻOiai hiki i nā antennas log-periodic ke uhi i kahi ākea ākea o ke alapine (frequency), hiki ke hoʻomaʻalahi ʻia ka hoʻolālā ʻōnaehana a hiki ke hoʻemi ʻia ka helu o nā antennas. Kōkua kēia i ka hōʻemi ʻana i ke kumukūʻai ʻōnaehana, hoʻemi i ka paʻakikī a hoʻomaikaʻi i ka hilinaʻi.

5. Hana kū'ē i ke komo ʻana: Loaʻa i ka antenna log-periodic ka hana kū'ē maikaʻi i ke komo ʻana i kahi alapine ākea. ʻO kona ʻano e hiki ai i ka antenna ke kānana maikaʻi i nā hōʻailona alapine i makemake ʻole ʻia a hoʻomaikaʻi i ke kū'ē ʻana o ka ʻōnaehana i ke komo ʻana.

I ka pōkole, ma ka hoʻolālā pololei ʻana i ka lōʻihi a me ka mamao o nā pepa metala, hiki i ka antenna log-periodic ke hana i nā ʻano alapine resonant he nui, me nā ʻano ākea ākea, ka loaʻa kiʻekiʻe a me ka pono o ka radiation, ka mana directivity, ka hoʻolālā ʻōnaehana maʻalahi a me ka anti-interference. nā pono hana. ʻO kēia ka mea e hoʻohana nui ʻia ai nā antennas periodic logarithmic i nā kamaʻilio uea ʻole, radar, noiʻi ʻepekema a me nā ʻoihana ʻē aʻe.