Ntọala Antenna & Nkwalite

Ntọala antenna bụ ihe #1 na arụmọrụ sistemụ RFID. dị mkpa karịa mmetụta akara ma ọ bụ ike onye na-agụ akwụkwọ. Onye na-agụ akwụkwọ $5,000 nwere antennas etinyere nke ọma ga-arụ ọrụ n'okpuru onye na-agụ akwụkwọ $500 nwere ndị e tinyere nke ọma. Ebumnuche ya bụ ịmepụta ebe ịgụ ihe akọwapụtara nke ọma (ebe 3D ebe a na-agụ akara ntụkwasị obi) mgbe ị na-ebelata ịgụ ihe na-ezighi ezi site na mpụga ebe a na-elekwasị anya.

Ihe atụ ụwa: ịkwaga antenna ọnụ ụzọ ọdụ ụgbọ mmiri site na ịdị elu 2.5m ruo 2.0m na itụ ya 15° ala mere ka ọnụego ịgụ ihe si 87% ruo 99.2% na nnukwu mbupu ngwa agha. Obere mgbanwe ọnọdụ na-emepụta nnukwu ọdịiche arụmọrụ n'ihi na ike mgbaàmà RF na-eso iwu inverse-square. okpukpu abụọ nke anya pụtara ¼ ike mgbaàmà.

Ntụgharị antenna na-ekpebi ntụzịaka nke ebili mmiri eletrik. Nke a bụ otu n'ime mkpebi kachasị mkpa na imewe sistemụ n'ihi na ọ na-achịkwa ozugbo ma ọ ga-ekwe omume ịgụ akara na ntụzịaka dị iche iche.

Ebe ịgụ bụ olu 3D ebe enwere ike ịgụ akara ntụkwasị obi. Ọ dị ka kọn ma ọ bụ lobe na-esi na ihu antenna, nwere akụkụ nke antenna uru, onye na-agụ TX ike, na mmetụta akara. Antenna 9 dBic na ike 30 dBm nwere akara NXP UCODE 9 (-22.1 dBm mmetụta) na-emepụta ebe ịgụ ihe dị ihe dịka mita 8–10 miri emi na mita 3–4 n'obosara na njedebe.

Near-field vs Far-field: UHF RFID antennas na-arụ ọrụ na mpaghara abụọ. Near-field (n'ime ~35cm na 920 MHz) na-eji njikọ magnetik maka obere, akụkụ akara akara. zuru oke maka ọdụ POS ebe ịchọrọ ịgụ naanị ihe dị na counter. Far-field (karịa 35cm) na-eji mgbasa eletrik maka ọtụtụ ngwa RFID. A na-emepụta antennas dị nso n'ọhịa nwere ebe ịgụ ihe ebe a na-agụ maka koodu ọkwa ihe na ebe ire ere.

Ntuziaka ike: 33 dBm maka oke oke (~10m, ọnụ ụzọ ọdụ ụgbọ mmiri). 30 dBm maka oke ọkọlọtọ (~6–8m, iji izugbe). 25 dBm maka oke etiti (~3–5m, eriri conveyor). 20 dBm maka obere oke (~1–2m, ebe ire ere). 15 dBm maka nso n'ọhịa (~0.5m, ndị na-agụ shelf). Na-amalite mgbe niile na ike dị ala wee bulie ruo mgbe ị ruru ọnụego ịgụ ihe gị. ike gabigara ókè na-akpata ịgụ ihe na-ezighi ezi.

33 dBm → ~10m   dock doors, max range
30 dBm → ~6-8m  general warehouse
25 dBm → ~3-5m  conveyor belts
20 dBm → ~1-2m  point-of-sale
15 dBm → ~0.5m  shelf / near-field

VSWR (Voltage Standing Wave Ratio) na-atụ otú ike si arụ ọrụ nke ọma site na onye na-agụ akwụkwọ gaa na antenna. Egwuregwu zuru oke bụ 1:1 (ike niile na-agbasa). Ihe ọ bụla dị n'elu 2:1 pụtara na a na-egosipụta ike dị ukwuu na onye na-agụ akwụkwọ, na-ebelata arụmọrụ ma nwee ike imebi PA amplifier ka oge na-aga. Ọtụtụ antennas RFID azụmahịa na-enweta 1.2–1.5:1 VSWR n'ofe band.

Nsogbu VSWR nkịtị: Eriri RF mebiri emebi ma ọ bụ kinked (dochie ma ọ bụrụ na VSWR gafere 2:1). Ụdị njikọ na-ezighi ezi (jiri RP-TNC ma ọ bụ SMA dị ka akọwapụtara). Antenna arụnyere ozugbo na elu ígwè na-enweghị oghere (jiri 15mm+ standoffs). Ntinye mmiri na njikọ mpụga (jiri RP-TNC na-eguzogide ihu igwe nwere akpụkpọ ụkwụ). Ogologo eriri gafere 10m na-enweghị eriri mfu dị ala (jiri LMR-400 ma ọ bụ ihe yiri ya maka ọsọ karịa 5m).

Na-egosipụta mgbe niile VSWR n'ofe band ị na-arụ ọrụ (920–925 MHz maka Vietnam). Antenna nwere ike igosi ezigbo 1.2:1 VSWR na 920 MHz mana na-ebelata ruo 2.5:1 na 925 MHz. nke pụtara arụmọrụ na-adịghị mma na ọkara ọwa FHSS gị.

Ọtụtụ ntinye ọrụ na-eji ọtụtụ antennas kwa onye na-agụ akwụkwọ. Ndị na-agụ akwụkwọ Nextwaves na-akwado ruo ọdụ ụgbọ antenna 32. Ihe ndị dị mkpa: Oghere. na-emekarị 1–2 mita iche maka ọnụ ụzọ ọdụ ụgbọ mmiri, nwere mkpuchi gburugburu 15–20% maka mkpuchi zuru oke. Ịrịgo akụkụ. 15–45° ntụgharị n'ime maka ngwa portal iji lekwasị anya na mpaghara ịgụ na ọnụ ụzọ. Usoro antenna. onye na-agụ akwụkwọ na-agbanwe n'etiti antennas na-akpaghị aka iji gbochie nnyefe n'otu oge site na mpaghara na-agbakọta.

Ihe atụ nhazi portal (ọnụ ụzọ ọdụ ụgbọ mmiri): Tinye antennas 4. 2 n'akụkụ ọ bụla nke ọnụ ụzọ na 1.5m na 2.5m ịdị elu, tụgharịa 30° n'ime. Jiri polarization linear na-ezube ihu pallet. Tọọ onye na-agụ akwụkwọ na Session S2 nwere Q=6 maka forklift na-agagharị ngwa ngwa. Nke a na-enye 99%+ ọnụego ịgụ na ụkpụrụ pallet ibu nke ikpe akara 48–100.

Ihe atụ ọwara conveyor: Tinye antennas polarized gburugburu 4 n'ime nhazi square gburugburu belt. elu, ala, ekpe, nri. Tọọ Session S1 maka ịgụ otu pasent. Ike na 25 dBm iji gbochie mpaghara ịgụ na ọwara ahụ. Nke a na-egbochi ịgụ akara na conveyors dị n'akụkụ.

CONFIGURE_ANTENNA_ENABLE payload (4 bytes):

Ports 1-4:    0x0F 0x00 0x00 0x00  (0b00001111)
Ports 1,3:    0x05 0x00 0x00 0x00  (0b00000101)
Port 1 only:  0x01 0x00 0x00 0x00  (0b00000001)

Bit 0=ANT1  Bit 1=ANT2  ...  Bit 31=ANT32

Ihe ndị dị n'elu ígwè bụ isi iyi nnyonye anya #1 na ụlọ nkwakọba ihe. Ha na-egosipụta mgbaàmà RF, na-emepụta ebe nwụrụ anwụ na nnyonye anya multipath. Ngwọta: tinye antennas na elu na-abụghị ígwè ma ọ bụ jiri 50mm+ standoffs site na ihe owuwu ígwè. Tụgharịa antennas ka isi lobe ahụ ghara ịkụ mgbidi ígwè ma ọ bụ racking ozugbo.

Mmiri na mmiri na-amịkọrọ ebili mmiri redio UHF nke ukwuu. Ihe nwere karama mmiri n'etiti antenna na pallet akara nwere ike igbochi ịgụ ihe kpamkpam. Ngwọta: tinye antennas ka ụzọ RF zere akpa mmiri, ma ọ bụ mụbaa ike site na 3–6 dB iji kwụọ ụgwọ maka mfu absorption.

Ndị na-agụ akwụkwọ ndị ọzọ na-arụ ọrụ n'akụkụ nwere ike ịkpata nnyonye anya. Dense Reader Mode (DRM) na FHSS na-enyere aka, mana usoro ndị ọzọ gụnyere: ịhazi ihe mkpuchi ọwa na-adịghị agbakọta n'etiti ndị na-agụ akwụkwọ dị n'akụkụ, iji antennas ntụziaka iji gbochie mgbasa, na itinye usoro TDMA ma ọ bụrụ na middleware gị na-akwado ya.

Debe antennas ≥1m site na ọkụ fluorescent (isi iyi mkpọtụ RF) na ≥2m site na ebe nnweta Wi-Fi. Ọ bụ ezie na Wi-Fi na-arụ ọrụ na 2.4/5 GHz (iche na UHF 920 MHz), akụrụngwa na-adịghị mma nwere ike ịmepụta harmonics broadband.