Ma ka mokuna ma mua, ua kūkākūkā mākou i nā ʻano hoʻoheheʻe. No ka nānā pono ʻana i ka hoʻoheheʻe antenna, pono kahi kiko kuhikuhi. Hoʻokō ka hoʻoheheʻe o kahi antenna isotropic i kēia kuleana.
Wehewehena
ʻO ka radiation isotropic e pili ana i ka radiation mai kahi kumu kiko e pālahalaha like ana ma nā ʻaoʻao āpau, me ka ikaika like me ka nānā ʻole i ke kuhikuhi ana. Hoʻoholo mau ʻia ka hoʻomaikaʻi ʻana o ke ʻano radiation o kahi antenna me ka hoʻohana ʻana i ka radiation isotropic ma ke ʻano he kuhikuhi. Inā like ka radiation ma nā ʻaoʻao āpau, ua kapa ʻia ia he radiation isotropic.
•ʻO kahi kumu kiko kahi laʻana o kahi radiator isotropic. Eia nō naʻe, ʻaneʻane hiki ʻole ke hoʻokō ʻia kēlā ʻano radiation isotropic, no ka mea, hoʻopuka kekahi antenna i kona ikehu me kekahi kuhikuhi.
•Ua like loa ke ʻano o ka radiation isotropic me ka radiation omnidirectional.
•Ke nānā ʻia ma ke ʻano 3D, he ʻano donut kona; ke nānā ʻia ma ke ʻano 2D, he ʻano kiʻi ʻewalu kona.
Hōʻike ke kiʻi ma luna i ke ʻano hoʻolaha o kahi radiator isotropic (a i ʻole omnidirectional). Hōʻike ke Kiʻi 1 i ke ʻano donut ma 3D, ʻoiai ʻo ke Kiʻi 2 e hōʻike ana i ke ʻano kiʻi ʻewalu ma 2D.
Loaʻa
Loaʻa i kahi radiator isotropic ka loaʻa ʻana o ka hui, ʻo ia hoʻi ka mea loaʻa he 1 ma nā ʻaoʻao āpau. Ke hōʻike ʻia ma nā decibels (dB), ua kapa ʻia kēia he 0 dB loaʻa (ʻole pohō).
Mana Hoʻohāliʻi Isotropikalike like (EIRP)
Wahi a ka wehewehe maʻamau, ʻo ka nui o ka mana i hoʻopuka ʻia e kahi antenna isotropic e hana i ka nui o ka mana kiʻekiʻe i ʻike ʻia ma ke kuhikuhi o ka loaʻa ʻana o ka antenna kiʻekiʻe loa ua kapa ʻia ʻo Equivalent Isotropically Radiated Power.
Ke kau ʻia ka ikehu i hoʻoheheʻe ʻia o kahi antenna ma kekahi ʻaoʻao a i ʻole ma kahi kuhikuhi kikoʻī, a ua like ka radiation ma ia kuhikuhi me ka mana i hoʻoheheʻe ʻia o ka antenna, ua kapa ʻia kēia radiation ʻo EIRP.
Loaʻa
ʻOiai he idealization wale nō ka radiation isotropic, hōʻike ia i ka radiation maikaʻi loa e hiki i kahi antenna ke hoʻokō. Loaʻa i kēlā antenna kahi loaʻa o 3 dBi, kahi e kūlike ai ʻo 3 dB i kahi kumu o 2, a ʻo "i" ke hōʻike nei i ka multiple e pili ana i ke kūlana isotropic.
Inā hoʻopili ʻia ka radiation i loko o kekahi kihi, piʻi ka EIRP me ka loaʻa ʻana o ka antenna. ʻOi aku ka maikaʻi o ka loaʻa ʻana o kahi antenna ma ka hoʻopili ʻana i kāna radiation i hoʻokahi ʻaoʻao.
Mana Hoʻolaha Kūpono (ERP)
Inā helu ʻia ka mana i hoʻoheheʻe ʻia me ka ʻōlelo ʻana i kahi antenna dipole hapalua nalu ma kahi o kahi antenna isotropic, ua kapa ʻia ʻo ia ʻo Effective Radiated Power (ERP).
ERP(dBW)=EIRP(dBW)−2.15 dBi
Inā ʻike ʻia ka EIRP, hiki ke helu ʻia ʻo ERP me ka hoʻohana ʻana i ke ʻano i hāʻawi ʻia ma luna.
No ka ʻike hou aku e pili ana i nā antennas, e kipa i ka pūnaewele:
Ka manawa hoʻouna: ʻApelila-17-2026
