RFID technology for vehicle and container...
Transcript of RFID technology for vehicle and container...
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RFID technology for vehicle and container
tracking
Challenges:
• Extremely lossy environment due to the presence of numerous metals that cause degradation in wireless signals
• Operating bandwidth of RFID nodes can vary from one country to another
• Multipath effect of wireless signals
• Power Constraints
• Materials (substrate for electronics) and packaging
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RFID in Automotive Applications:
Example: Radiation for a Single Car
RFID Tag placed vertically on the license plate
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• Shows the importance of placing the RFID
tag correctly.
RFID in Automotive Applications:
In the Parking Lot
Model of car body in 3D EM Simulator FEKO
Radiation Pattern of RFID Antenna placed on back car’s license plate
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The existence of the front car heavily suppresses the signal of
the RFID placed on the back car’s license plate. Energy goes
from the back instead of front. It shows the importance of
looking for the correct place for RFID tag.
RFID in Automotive Applications:
In the Parking Lot
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The performance of a windshield tag in a parallel parking situation.
Looking for the Correct Positioning …
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• May build a thin/thick layer of ice/snow/water on windows
• Simulate the environment with the humid conditions (changes in
dielectric constant and loss tangent of air)
Environmental Factors:
Snow, Ice, Rain, Humidity
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In Tire Analysis
• Tilt the antenna 45° • Radiation normal to the tire is better
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Encapsulation Mat’l
Chip Pad
Antenna
Primer
Encapsulation Mat’l
Chip Pad
Silicon
Wire Bonding Chip
Chip
Primer
RFID Antenna Module for Tire
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RFID Tire Application
RFID in Tire
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Radar Applications - Motivation
Current Radars
• Reduce area
Array and T/R
module
Ground plane
Packaged flip-chip SiGe T/R
moduleBeam Steering 77 GHz Array
Next Generation Radars
Road traffic accidents rise from 9th
leading cause of death in 2004 to 5th
in 2030.
• Reduce area
(8x11cm→6x6 cm)
due to more efficient
antenna
•Replace waveguide with
3D RF Transition
• Use low cost substrates
• Achieve wider scan
angle by replacing
switched beam
antenna with
phased array
Packaged flip-chip
mounted T/R module
Thermal vias
Heat Rejection 77 GHz array
DSP
PCB
Digital/ IF signals
3D Via transition
200-400 µm PCB
Cross-Section
100 µm LCP layer
100 um thick LCP
200-400 um PCB
Heat Rejection
Ground plane
3D Via transition
PCB
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3D Transitions
50 ohm line CPW
50 ohm line CPW
LCP: 4 mils
50 ohm line M-Strip
Plane of Symmetry
-65
-55
-45
-35
-25
-15
-5
10 20 30 40 50 60 70 80 90 100Frequency (GHz)
90 degree with no center VIAS
90 degree Center VIAS only
90 degree Center and corner vias
Tapered 2 VIAS
Tapered 4 VIAS
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Antenna Design/Integration