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Ways of Benchmarking the UHF RFID Systems

Ways of Benchmarking the UHF RFID Systems. Damon Tsang. 第一屆中國無線射頻識別基準測試發展論壇 暨 備忘協議簽訂儀式 March 1, 2008. Antenna. Tag Antenna. Tag. IC. Computer Software. External Interface. Reader. A Typical UHF RFID System. Main components contain: Reader Antennas Tags

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Ways of Benchmarking the UHF RFID Systems

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  1. Ways of Benchmarking the UHF RFID Systems Damon Tsang 第一屆中國無線射頻識別基準測試發展論壇 暨 備忘協議簽訂儀式 March 1, 2008

  2. Antenna Tag Antenna Tag IC Computer Software External Interface Reader A Typical UHF RFID System • Main components contain: • Reader • Antennas • Tags • Computer software for controlling the reader to read from and write to tags CSL--A Chung Nam Company

  3. Common Problems found in UHF RFID Systems • Missing Tags - Out of read coverage - Insufficient output power • Cross Reads - Reflection - Over power CSL--A Chung Nam Company

  4. Scenario 1 – Read/Write Tags in An Assembly Line Antenna Read coverage 50 trials – Fail to read all tags Tags 3 tags gone missing • Outcomes: • Shorter the antenna, narrower the reading range • Only 17 tags are read due to out of range • Conditions: • Be able to read all 20 tags at the height of 0.75m • Read with 1 antenna • Output power at 28dBm Cont… CSL--A Chung Nam Company

  5. Antenna Read coverage Wider read range Scenario 2 – Read/Write Tags in An Assembly Line 50 trials – Fail to read all tags Tags • Conditions: • Increase the height to 1m to cover wide read range • Be able to read all 20 tags • Read with 1 antenna • Output power at 28dBm • Outcomes: • Higher the antenna, wider the reading coverage • Be able to read more tags • Only 19 tags are read due to the insufficient power Cont… CSL--A Chung Nam Company

  6. Output Power 28dBm -> 30dBm Scenario 3 – Read/Write Tags in An Assembly Line 50 trials – Cross read occurs • Conditions: • Increase the height to 1m to cover wider read range • Increase the output power to 30dBm • Be able to read all 20 tags • Read with 1 antenna • Avoid cross reading of tags • Outcomes: • Higher the antenna, wider the reading coverage • More output power to radiate the tags • Be able to read all tags • 2 more unwanted tags are read due to an increase of output power (cross read occurs) Cont… CSL--A Chung Nam Company

  7. Scenario 4 – Read/Write Tags in An Assembly Line Set RSSI to -60 dBm 50 trials – Perfect result! Solutions: • Power increases from 28dBm to 30dBm • Change the value of the RSSI • Filter the unwanted tags < -60dBm CSL--A Chung Nam Company

  8. Forklift trucks are in queue waiting Scenario 5 – Double Gate Door Benchmarking Database Checklist Association Out • Conditions: • Be able to read all 40 tags • 4 antennas with output power at 32.5dBm each • Outcomes: • 40 tags are successful read against the backend database Cont… CSL--A Chung Nam Company

  9. Forklift trucks are in queue waiting Scenario 6 – Double Gate Door Benchmarking Database Checklist Association Go back & proceed again due to missing tags • Outcomes: • 1 tag is missing after checking against the backend database • Conditions: • Be able to read all 40 tags • 4 antennas with output power at 32.5dBm each • Solutions: • Go back and pass the gate door again until all tags are read Cont… CSL--A Chung Nam Company

  10. Forklift trucks are in queue waiting Scenario 7 – Double Gate Door Benchmarking Database Checklist Association Database Checklist Association • Conditions: • Be able to read all 40 tags when passing thru 2 doors • 8 antennas with output power at 32.5dBm each • Outcomes: • 1 tag is missing at the Door 1 • 100% read is at the Door 2 • Improve the chance of success of the reading rate • Shorten the queuing time Cont… CSL--A Chung Nam Company

  11. Forklift trucks are in a queue waiting Scenario 8 – Double Gate Door Benchmarking Database Checklist Cross referencing Database Checklist • Outcomes: • No identical missing tags read in 2 doors assuming that 100% read rate is achieved – no missing tags occur • Improve the chance of success of the reading rate • Shorten the queuing time • Conditions: • Be able to read all 40 tags when passing thru 2 doors • 8 antennas with output power at 32.5dBm each Cont… CSL--A Chung Nam Company

  12. Summary • Benchmarking a RFID system in an assembly line is based on the read coverage, output power, and RSSI to minimize missing tags and cross reads • Benchmarking a RFID system using the doublegate door system avoids missing tags, increases productivity, and reduces queuing time CSL--A Chung Nam Company

  13. Thank You!! Contact: damontsang@convergence.com.hk CSL--A Chung Nam Company

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