ʻO ka antenna log-periodic he antenna ākea 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, ka loina hana a me nā pono o nā antenna log-periodic.

ʻO ka mōʻaukala o nā antenna log-periodic

ʻO ka antenna log-periodic he antenna ākea ākea nona ka hoʻolālā e pili ana i ka hanana log-periodic. ʻO ka mōʻaukala o nā antenna log-periodic mai ka 1950s.

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

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

Hoʻokumu ʻia ka loina hana o ka log-periodic antenna ma kāna ʻano hana kūikawā. Loaʻa iā ia kahi pūʻulu o nā papa metala ʻē aʻe, e hoʻonui ana kēlā me kēia i ka lōʻihi a me ka spacing e like me ka manawa logarithmic. Hoʻokumu kēia ʻano hana i ka antenna e hana i nā ʻokoʻa ʻokoʻa i nā alapine like ʻole, a laila e loaʻa ai ka radiation ākea ākea.

Ke holomua nei ka ʻenehana, ua hoʻomaikaʻi ka hoʻolālā a me nā ʻano hana 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 kāna kumu hana penei

1. ʻO ke kumu o ka Resonance: ʻO ka hoʻolālā ʻana o ka antenna log-periodic e pili ana i ka loina 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 hoʻomālamalama i nā nalu electromagnetic. Ma ka hoʻolālā pololei ʻana i ka lōʻihi a me ka spacing o nā ʻāpana metala, hiki i nā antenna log-periodic ke hana i nā pae alapine resonant.

2. Māhele ʻokoʻa: ʻO ka lākiō log-periodic o ka ʻāpana metala ka lōʻihi a me ke kaawale o ka antenna log-periodic e hana ai kēlā me kēia ʻāpana metala i kahi ʻokoʻa ma nā alapine like ʻole. Ke alakaʻi nei kēia ʻokoʻa ʻāpana i ke ʻano resonant o ka antenna ma nā alapine like ʻole, e hiki ai i ka hana ākea ākea. Hana nā ʻāpana metala pōkole i nā alapine kiʻekiʻe, aʻo nā ʻāpana metala lōʻihi e hana i nā alapine haʻahaʻa.

3. ʻO ka nānā ʻana i ke kukui: ʻO ke ʻano o ka antenna log-periodic e loaʻa iā ia nā hiʻohiʻona radiation like ʻole ma nā alapine like ʻole. Ke hoʻololi nei ke alapine, hoʻololi ʻia ke kuhikuhi radiation a me ka laulā o ka antenna. ʻO ia ke ʻano hiki i nā antenna log-periodic ke nānā a hoʻoponopono i nā kaola ma luna o kahi pūʻulu alapine ākea.

ʻO nā pono o nā antenna log-periodic

1. Nā hiʻohiʻona broadband: ʻO ka antenna log-periodic he antenna ākea ākea e hiki ke uhi i nā kaula alapine he nui. ʻO kāna ʻano log-periodic e hiki ai i ka antenna ke loaʻa nā ʻano radiation like ʻole ma ka laulā holoʻokoʻa holoʻokoʻa, e hoʻopau ana i ka pono no ka hoʻololi pinepine ʻana a i ʻole ka hoʻololi ʻana i nā antenna, e hoʻomaikaʻi ana i ka ʻōnaehana a me ka pono.

2. Loaʻa ka waiwai kiʻekiʻe a me ka pono o ka radiation: Loaʻa pinepine nā antenna log-periodic i ka loaʻa kiʻekiʻe a me ka pono radiation. Hāʻawi kona ʻano i ka resonance i nā pae alapine he nui, e hāʻawi ana i ka radiation ikaika a me ka hiki ke hoʻokipa.

3. Mana kuhikuhi: ʻO nā antenna log-periodic he kuhikuhi maʻamau, ʻo ia hoʻi, ʻoi aku ka ikaika o ka radiation a i ʻole ka hiki ke hoʻokipa ma kekahi mau kuhikuhi. Hana kēia i nā antenna log-periodic kūpono no nā noi e koi ana i ka kuhikuhi ʻana o ka radiation, e like me ke kamaʻilio, radar, etc.

4. E hoʻomāmā i ka hoʻolālā ʻōnaehana: No ka mea hiki i nā antenna log-periodic ke uhi i kahi ākea ākea, hiki ke maʻalahi ka hoʻolālā ʻōnaehana a hiki ke hoʻemi ʻia ka nui 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 kū'ē: Loaʻa i ka antenna log-periodic maikaʻi ka hana anti-interference ma kahi alapine ākea. Hiki i kona hoʻolālā ke hiki i ka antenna ke kānana maikaʻi i nā hōʻailona alapine makemake ʻole a hoʻomaikaʻi i ke kūpaʻa ʻana o ka ʻōnaehana i ka hoʻopilikia.

I ka pōkole, ma ka hoʻolālā pololei ʻana i ka lōʻihi a me ka spacing o nā ʻāpana metala, hiki i ka log-periodic antenna ke hana i nā pae alapine resonant he nui, me nā hiʻohiʻona ākea, loaʻa kiʻekiʻe a me ka pono o ka radiation, ka mana kuhikuhi, ka hoʻolālā ʻōnaehana maʻalahi a me ka anti-interference. . pono hana. Hana kēia i nā antenna periodic logarithmic i hoʻohana nui ʻia i nā kamaʻilio uea, radar, noiʻi ʻepekema a me nā kula ʻē aʻe.