User Manual

UHF Integrated RFID Reader Manual Guangdong Sygole Intelligent Technology Co.,Ltd
18
Model
Communication
Interface
SG-UR-I81
SG-UR-I82
SG-UR-I83
RS485
SG-UR-I81-RS485
SG-UR-I82-RS485
SG-UR-I83-RS485
POE
SG-UR-I81-POE
SG-UR-I82-POE
SG-UR-I83-POE
5. Antenna
The I81/I82/I83 series readers integrate 3dBi, 4dBi and 8dBi right-hand circularly
polarized antennas with voltage standing wave ratio less than 1.3, which is convenient
for distributed deployment. The following briefly describes the electromagnetic field
distribution of the antenna and the effect of the field on the tag.
As shown in the figure below, the radiation field of the antenna is divided into three
parts: the main lobe, the side lobe and the back lobe.
Fig 5.1 Antenna radiation field distribution Fig 5.2 3D antenna radiation field distribution
The radiant energy of the antenna is mainly concentrated in the main lobe area. In
practical applications, the tag should be read as far as possible in the main lobe field
of the antenna to achieve a better recognition effect. The upper side lobes have a
higher angle and a longer influence distance, which easily causes cross-region
interference. That is, if adjacent tags are too close, the antenna will read other tags.
Between the main lobe and the lower side lobes, there is a lower zero trap, which will
cause a signal dead zone at this position. The "lower zero depth" vacancy can be filled
by means of beam shaping.