MPR-2010AR
Page 7
Doc# 041308
AWID PROPRIETARY
well-designed dual-antenna reader can usually provide 25 to 30 dB of isolation between
the two signal paths, reducing the unwanted signal in the receive chain to –20 dBm.
However, when the RFID reader antenna is facing a tag placed on a large metallic
object at a distance of 12 inches, the reflected transmitter signal at the receiver input
can be as high as 13dBm, thereby eliminating any advantage of the dual-antenna
design.
In actual circuit implementation, AWID developed a proprietary circuit to duplicate the
functions of the circulator, with improved directivity and isolation.
Figure 2 Block Diagram, Dual-Antenna RFID Reader
1.2 SPECIAL
FEATURES:
•
Multi-Protocol: ISO-18000-6 Type B, EPC Class 1
2
Gen 1 & 2, EM Micro, EPC
Class 0
3
, EPC V1.19 Rev.2
•
Thin passive tags with long-range performance
•
High performance circular polarized antenna
•
RS-232
input/output
•
Splash proof design for indoor or outdoor applications
•
UV
stabilized
housing
•
2
Both 64- and 96-bit
3
Both 64- and 96-bit
RCVE
XMIT
RF
Q
RCVR
FREQUENCY
SYNTHESIZER
Driver
AMP
Power
AMP
COUPLER
BPF
BPF
A/D
CPU
I/O
I
I/Q DEMOD
IQ
I
Q
FREQ AMPL
XMTR
