Dɛn Ne Antenna Mfiridwuma a Wɔde Di Dwuma Wɔ Radio Frequency Identification (RFID) Mu?

Dɛn Ne Antenna Mfiridwuma a Wɔde Di Dwuma Wɔ Radio Frequency Identification (RFID) mu?

 

Mfeɛ pii mu no yɛadi huammɔdi ho nsɛm ɔhaha pii ho dwuma, na bɛyɛ du biara mu akron fi antenna haw ahorow mu mmom sen chip sintɔ ahorow. Awerɛhosɛm ne sɛ adetɔfo dodow no ara de adapɛn pii toto chip datasheets ho bere a antenna nhyehyɛe no wie wɔ da koro anaa nnanu mu.

RFID no trɛw frequency band ahorow anan mu. Antenna physics no yɛ soronko koraa wɔ wɔn ntam araa ma sɛ wode 125 kHz coil toto 900 MHz dipole ho a, ɛte sɛ nea wode transformer toto TV broadcast tower ho.

 

 

Wɔ frequency a ɛba fam ne frequency a ɛkorɔn-125 kHz ne 13.56 MHz-tag no te akenkanfo antenna no afã a ɛbɛn no mu. Ahoɔden nam magnetic flux linkage a ɛda coil abien ntam so na ɛkɔ, te sɛ sɛnea transformer yɛ adwuma no. Enti yɛtaa mfrɛ no "antenna" koraa-"coil" anaa "inductor" yɛ pɛpɛɛpɛ kɛse. LF coils mframa kɔbere waya twa ferrite abaa ho hyia. Ferrite yɛ dɔte a ɛwɔ magnetic permeability kɛse a ɛma flux no yɛ kɛse ma ɛyɛ ketewaa bi. 13.56 MHz, dodow no ara coils yɛ flat spirals etched wɔ PCB anaa PET film-wɔ yɛn adwumayɛbea no gyinapɛn ne 0.07mm kɔbere foil thickness.

Anohyeto a mfaso wɔ so ma band abien no nyinaa ne ebia mita biako akenkan kwan wɔ tebea horow a eye mu. Mpɛn pii no, ɛba fam.

 

Sɛ woduru 860-960 MHz pɛ a, agodie no sesa koraa. Asorɔkye no tenten so tew araa ma antena a ne kɛse fata betumi ama anyinam ahoɔden asorɔkye akɔ akyirikyiri ankasa. Dipoles, meander-lines, patches-antenna nhyehyɛe ankasa a ɛwɔ radiation nhyehyɛe ne impedance su a ɛho hia.

 

Asorɔkye dipole fã-a ɛwɔ 915 MHz no tu mmirika bɛyɛ sɛntimita 16 fi ano kosi ano. Meander-line designs bobɔ saa tenten no kɔ anim ne akyi ma ɛfata wɔ label ketewa bi so. Wode bandwidth sesa de gye compactness. Tiyɛ kɛse no ne impedance matching. UHF RFID chips kyerɛ impedance a ɛyɛ den a ɔfã ankasa bɛyɛ 20Ω ne capacitive reactance mpɛn pii no ntam -150 kosi -220Ω gyina chip model. Ɛsɛ sɛ antena no ma conjugate no. Simulation software di eyi ho dwuma mprempren nanso sɛ wobenya match a wotumi de ho to so wɔ manufacturing tolerance nyinaa mu no gye iteration.

 

Sɛ wode tag bi bata dadeɛ so ara pɛ a, adwumayɛ so tew kɛseɛ-ebia eyi ne asɛm baako a ɛtaa ba wɔ UHF nnwuma mu. Patch antennas a ɛwɔ fam wimhyɛn yɛ adwuma twa eyi ho hyia nanso ɛde ɛka ne ne kɛse ka ho.

 

Microwave bands a ɛwɔ 2.45 GHz ne nea ɛboro saa wɔ hɔ ma RFID nanso wohu sɛ wɔgye tom kakraa bi wɔ towtua akyi ne bere ankasa -bere beae nhyehyɛe.

Manufacturing consistency tetew adwumayɛ deployments fi afuw mu huammɔdi ahorow. Coil winding nhyɛso nya inductance so nkɛntɛnso. Etching chemistry nya trace geometry so nkɛntɛnso. Screen printing variables nya krataa a ɛko tia no so nkɛntɛnso. Chip bonding quality ka nkwa tenten-bere. Eyi mu biara nkyerɛ wɔ datasheet so.

Sɛ worepaw frequency a, fa physics no toto ɔhaw no ho. LF hyɛn ntini mu na ɛyɛ adwuma bɛn dade-mmoa a wohu no tu mmirika wɔ so esiane ntease pa nti. HF di NFC ne sikatua akwammisa ho dwuma. UHF de range ne ahoɔhare ma inventory ne logistics nanso ɛhwehwɛ sɛ wɔde adwene si nneɛma a atwa yɛn ho ahyia so.

 

 

Datasheet range specifications fa no sɛ lab tebea a eye-tag facing reader, free space, biribiara ntwitware. Sɛ wopɛ adwuma nhyehyɛe ankasa a, fi ase denam saa dodow no a wobɛtwitwa mu abien so, afei fa 20% foforo a ɛsom bo no to soro. Biribiara a ɛwɔ atifi hɔ no firi deɛ yɛasua wɔ yɛn tag ne akenkanfoɔ dwumadie a yɛde retu mmirika wɔ Jingzhou wɔ mfeɛ dunwɔtwe a atwam no mu-te nka sɛ wowɔ ahofadie sɛ wobɛka ho sɛ wopɛ sɛ wobɔ nsɛm pɔtee bi ho nkɔmmɔ a.