Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of...
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![Page 1: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/1.jpg)
Dual-frequency Antenna Design for RFID Application
Kin Seong LeongAuto-ID Laboratory, School of Electrical and
Electronic Engineering, The University of Adelaide
![Page 2: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/2.jpg)
Introduction
• Radio Frequency Identification (RFID)– Enable supply chain automation.
• Item level tagging– Each and every item has it own tag with
unique ID.– Tag is usually passive.
![Page 3: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/3.jpg)
Frequency Bands in RFID
• LF (<135 kHz)
• HF (13.56 MHz)
• UHF (860 – 960 MHz)
• Microwave (2.45 GHz)
![Page 4: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/4.jpg)
Frequency Band in RFID
• LF (<135 kHz)
• HF (13.56 MHz)
• UHF (860 – 960 MHz)
• Microwave (2.45 GHz)
![Page 5: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/5.jpg)
HF vs UHF
![Page 6: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/6.jpg)
Proposal Formulation
Merge HF and UHF
Dual Frequency Antenna
(With frequency ratio ≈ 70)
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Current Technology
• Microstrip patch antenna– Too low frequency ratio (< 5).
• Common aperture antenna– Dual feed point
![Page 8: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/8.jpg)
Brain Storming
• Merging a HF antenna and an UHF antenna.
• Idea:– A HF multi-turn coil antenna.– A UHF planar dipole.– A transmission line to separate both
the above antennas.
![Page 9: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/9.jpg)
Design Aim (1)
• Antenna impedance equals to the complement of the input impedance of the RFID chip at UHF operation– Design frequency: 960 MHz– Chip impedance: 17 - j150Ω – Design aim: 17 + j150Ω
• A resonance point at HF.– Parallel resonance.– Zero reactance and infinite resistance.
![Page 10: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/10.jpg)
Design Aim (2)
• A single feed antenna.– Avoid modification on existing chip
• Reasonable antenna size and cost.– Not the focus of this paper.– The final design must not be larger than
14400 mm square.
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A Simple HF RFID Antenna
• A multi-turn planar spiral antenna.
![Page 12: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/12.jpg)
A Simple UHF RFID Antenna
• A dipole with matching network.– RFID chip is usually capacitive. The matching
network is to transform the antenna into inductive to enable conjugate matching.
![Page 13: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/13.jpg)
An Initial Picture
• Feed point chosen to be at B.
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Final Design
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Chip
Final Design (1)
• Transmission line to transfer the HF coil antenna impedance to very high value (ideally open circuit).
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Final Design (2)
• Overlapping loops to provide high capacitance.
Chip
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Final Design (3)
• A gap to prevent the UHF antenna shorting the HF antenna. A patch on the bottom provides path for UHF operation.
Chip
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Final Design (4)
• DC path for rectifier circuit (some type).
Chip
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Simulation
• Using Ansoft HFSS
• Simulated impedance (at 960 MHz):– 24 + j143Ω– Very near to the target of 17 + j150Ω
• Resonance near 13.56 Mz
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Fabrication
• On double-sided FR4
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Measurement Setup
SMA Connector(At the chip location)
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HF Testing
• Transmission measurement: Resonance at HF.
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UHF Testing (1)
• Impedance measurement: Matching impedance with respect to RFID chip.
![Page 24: Dual-frequency Antenna Design for RFID Application Kin Seong Leong Auto-ID Laboratory, School of Electrical and Electronic Engineering, The University.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649daa5503460f94a98647/html5/thumbnails/24.jpg)
UHF Testing (2)
• At 960 MHz:– 50 + j135Ω
• Balance to unbalance problem– BALUN needed.
• Pattern in good agreement
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Future Work
• Miniaturization.– To fit in small objects.
• Actual testing with RFID chips.– To obtain performance (read range)
measurement.
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Conclusion
• a detailed design for a high frequency ratio dual-frequency antenna.