Wanem ol antena teknoloji we ol i save yusim long redio frikwensi aidentifikesen (RFID)?

Wanem ol antena teknoloji we ol i save yusim long redio frikwensi aidentifikesen (RFID)?

 

Long ol yia i go pinis mipela i bin stretim planti handet keis bilong bagarap, na klostu 9-pela long olgeta 10-pela i kamap long ol hevi bilong antena na i no long ol hevi bilong 'chip'. Sori tru planti kastoma i save lusim planti wik long skelim ol 'chip datasheet' taim ol i save pinisim disain bilong antena insait long wanpela o tupela de.

RFID i karamapim foapela 'frequency band'. Fisiks bilong antena i narakain tru namel long tupela na sapos yu skelim wanpela 125 kHz koil wantaim wanpela 900 MHz dipol em i wankain olsem yu skelim wanpela transfoma wantaim wanpela TV brodkas taua.

 

 

Long liklik na bikpela frikwensi-125 kHz na 13.56 MHz-tag i sindaun klostu long rida antena. Eneji i save go long rot bilong 'magnetic flux linkage' namel long tupela 'coil', wankain olsem wok bilong wanpela 'transformer'. Olsem na mipela i no save kolim em olsem "antena" nating-"coil" o "inductor" em i stret moa. Ol LF koil i save tanim kopa waia i go klostu long ol 'ferrite rod'. Ferrite em i wanpela 'ceramic' we i gat bikpela 'magnetic permeability' we i save bungim 'flux' i go insait long liklik hap. Long 13.56 MHz, planti koil em ol 'flat spiral' we ol i bin raitim long PCB o PET film-long faktori bilong mipela standet em 0.07mm kopa foil tiknes.

Praktikel limit bilong tupela ben em ating wanpela mita bilong 'read range' aninit long gutpela kondisen. Planti taim liklik.

 

Taim yu kamap long 860-960 MHz, gem i senis olgeta. Wevlengt i go liklik inap long wanpela antena we i gat gutpela sais inap long salim ol 'electromagnetic wave' i go long longwe ples. Ol 'dipoles', 'meander-lains, ol 'patches'-ol trupela antena straksa wantaim ol 'radiation patterns' na 'impedance characteristics' we i bikpela samting.

 

Wanpela hap-wev dipole long 915 MHz i save ron inap 16 sentimita long wanpela tip i go long narapela hap. Ol 'Meander-lain disain i save foldim dispela longpela i go i kam long putim long wanpela liklik lebol. Yu senisim 'bandwidth' long 'compactness'. Bikpela het pen em i 'impedance matching'. Ol UHF RFID sip i gat kompleks impedens wantaim 'real part' klostu long 20Ω na 'capacitive reactance' i save stap namel long -150 na -220Ω bihainim 'chip model'. Antena i mas givim 'conjugate'. Simulation sofwet i save lukautim dispela nau tasol long kisim wanpela gutpela samting we i save kamap long olgeta hap bilong 'manufacturing tolerance' i nidim planti taim.

 

Taim yu putim wanpela 'tag' long wanpela metal, pefomens i go daun tru-dispela em i wanpela hevi we i save kamap planti taim long ol UHF projek. Ol 'patch antenna' wantaim ol 'ground plane' i wok long stretim dispela tasol i save putim pe na 'thickness'.

 

Ol 'microwave bands' long 2.45 GHz na antap i stap bilong RFID tasol ol i no save yusim planti ausait long ol 'toll collection' na ol 'real-time location systems.

Pasin bilong wokim ol samting i stap wankain i save separetim ol wok diploimen na ol feilia long fil. Tensen bilong 'coil winding' i save afektim 'inductance'. Kemistri bilong 'etching' i save senisim 'trace geometry'. Ol samting we i save kamap long 'screen printing' i save mekim 'sheet resistance' i no inap senis. Kwaliti bilong 'chip bonding' i save mekim wok long stap laip longpela taim. Nogat wanpela bilong ol dispela i kamap long wanpela datasit.

Taim yu makim 'frequency', makim 'physics' wantaim hevi. LF i save go insait long ol 'tissue' na wok klostu long metal-ol samting bilong luksave long ol animal i save ran long en long gutpela as. HF i save lukautim NFC na ol aplikesen bilong peim mani. UHF i save givim 'range' na 'speed' bilong 'inventory' na 'logistics' tasol i nidim luksave long ol samting bilong envairomen.

 

 

Ol spesifikasen bilong datasit i tingim ol gutpela kondisen bilong lab-tag i lukluk i go long rida, fri spes, nogat samting i bagarapim. Long plenim projek tru, stat long katim dispela namba long tupela hap, na bihain putim narapela 20% mak antap. Olgeta samting antap i kam long wanem samting mipela i bin lainim taim mipela i ranim ol 'tag' na 'reader' prodaksen bilong mipela long Jingzhou long las 18 yia-yu ken toktok wantaim mipela sapos yu laik toktok long ol spesifik samting.