RFID UHF antenna hoʻokaʻawale a koho
ʻO RFID UHF antenna kahi mea koʻikoʻi o nā lako lako i ka heluhelu RFID, ʻo ka ʻokoʻa RFID UHF antenna e pili pono i ka mamao heluhelu a me ka laulā. ʻO nā antenna RFID UHF o nā ʻano like ʻole, pehea e koho ai i ka antenna RFID UHF pono e like me nā papahana like ʻole he mea nui loa.
Wahi a nā mea like ʻole
Aia nā antenna PCB RFID, antenna ceramic RFID, alumini plate antenna a me FPC antenna, a me nā mea ʻē aʻe.. Loaʻa i kēlā me kēia mea nā pono a me nā hemahema a hoʻohana ʻia i nā ʻano ʻano like ʻole. E like me ka ceramic RFID antenna, paʻa ka hana a me ka liʻiliʻi liʻiliʻi. ʻIke mākou ʻo ka liʻiliʻi liʻiliʻi o ka antenna seramika ʻo 18X18 mm, ʻoiaʻiʻo, aia paha nā mea liʻiliʻi. Akā ʻaʻole kūpono ka antenna seramika e hana nui loa, ʻo ka mea nui loa ma ka mākeke ʻo RFID UHF antenna 5dbi, nui 100 * 100mm. Inā nui ka nui, ʻaʻole maikaʻi ka hana a me ke kumukūʻai e like me ka PCB a me ka antenna alumini. ʻO UHF PCB antenna he antenna waiwai nui a ʻo ia ke koho o ka hapa nui o ka poʻe. No ka PCB RFID antenna, hiki ke hoʻokomo i ka pūpū e hālāwai me ka hoʻohana waho. ʻO ka hiʻohiʻona nui loa o ka antenna FPC he maʻalahi, kūpono no nā huahana uila liʻiliʻi āpau.
ʻO ka ʻokoʻa ma waena o nā antenna circularly polarized a me linearly polarized
No ka linear polarization, i ka wā e kūlike ai ke kuhikuhi polarization o ka antenna e loaʻa ana me ke kuhikuhi polarization linear (ke kuhikuhi o ke kahua uila), ʻoi aku ka maikaʻi o ka hōʻailona (ʻo ka projection o ka hawewe electromagnetic i ka kuhikuhi polarization ka nui loa). Ma kahi ʻē aʻe, ʻoiai ʻoi aku ka ʻokoʻa o ke kuhikuhi polarization o ka antenna e loaʻa ana mai ka laina polarization kuhikuhi, e liʻiliʻi ka hōʻailona (e emi mau ana ka projection). I ka manawa o ka polarization kuhikuhi o ka antenna e loaʻa ana i orthogonal i ka linear polarization kuhikuhi (magnetic field direction), ka hōʻailona i hoʻokomo ʻia he zero (projection is zero). Loaʻa i ke ʻano polarization linear nā koi kiʻekiʻe ma ke kuhikuhi o ka antenna. ʻAʻole hoʻohana pinepine ʻia nā antenna linearly polarized, no ka laʻana, pono nā antennas i ka microwave anechoic chamber hoʻokolohua pono e linearly polarized antennas.
No nā antenna circularly polarized, ua like ka hōʻailona i hoʻokomo ʻia me ka nānā ʻole i ke kuhikuhi polarization o ka antenna e loaʻa ana, a ʻaʻohe ʻokoʻa (ʻo ka projection o nā hawewe electromagnetic ma kekahi ʻaoʻao like). No laila, ʻo ka hoʻohana ʻana i ka polarization circular e ʻoi aku ka liʻiliʻi o ka ʻōnaehana i ka orientation o ka antenna (eia ka orientation ka orientation o ka antenna, ʻokoʻa ia mai ka orientation o ka ʻōnaehana kuhikuhi i ʻōlelo ʻia ma mua). No laila, hoʻohana ʻia nā antenna circularly polarized i ka hapa nui o nā kūlana i nā papahana IoT.
ʻO ka ʻokoʻa ma waena o nā antenna RFID kokoke a me nā antenna RFID mamao
E like me ka manaʻo o ka inoa, nearfield RFID antenna he antenna no ka heluhelu kokoke. Hoʻopili ʻia ka radiation ikehu ma kahi kokoke loa ma luna o ka antenna, e hōʻoiaʻiʻo ana i ka hopena heluhelu kokoke me ka ʻole o ka heluhelu hewa ʻana a i ʻole ke kaula heluhelu i nā hōʻailona RFID a puni. Hoʻohana nui ʻia kāna mau noi i nā papahana e pono e heluhelu ʻia ma kahi kokoke me ka ʻole o ka heluhelu hewa ʻana i nā hōʻailona a puni ka antenna, e like me ka hoʻokele waiwai waiwai, hoʻokele lāʻau lapaʻau, hale kūʻai hale kūʻai ʻole, a me nā keʻena hāmeʻa akamai a pēlā aku.
Loaʻa i ka antenna RFID mamao loa kahi kihi radiation nui a me kahi mamao lōʻihi. Me ka hoʻonui ʻana o ka loaʻa ʻana o ka antenna a me ka nui, hoʻonui ka nui o ka radiation a me ka mamao heluhelu. Ma ka noi, pono nā antenna mamao loa no ka heluhelu mamao, a hoʻohana pū ka mea heluhelu lima i nā antenna mamao. No ka laʻana, ka hoʻokele logistic hale kūʻai, ka mālama ʻana i nā mea hana hale a me ka waihona waiwai waiwai, etc.