Design Selection

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These questions are derived from the Self Test Software Practice Test for CompTIA’s RFID+ exam.

 

Objective: Design Selection
SubObjective: Summarize how hardware selection affects performance

 

Single Answer, Multiple Choice

 

You are an RFID specialist in a DVD library. The owner of the DVD library wants to deploy an RFID solution to prevent the theft of DVDs from the library. You plan to put tags on the DVDs to detect theft. The tag on a DVD will be turned off only when the DVD is purchased by a customer.

 

Which type of RFID tags should you use in this scenario?

 

 

  1. SAW tags
  2. active tags
  3. EAS tags
  4. passive tags

 

Answer:

 

C. EAS tags

 

Tutorial:

 

You should use electronic article surveillance (EAS) tags in this scenario. The tag on a DVD should be turned off when the DVD is purchased by a customer. The tag will remain turned on until it is purchased. EAS tags are simple electronic tags that can be turned on or off. EAS tags have a storage capacity of 1 bit and can be used to store two values: 0 and 1. When a customer purchases a DVD, the tag is turned off at the payment counter. When a person steals a DVD and tries to pass through the exit area carrying a DVD with a tag that is not turned off, an alarm is triggered. This prevents theft of DVDs from the library.

 

You should not use surface acoustic wave (SAW) tags in this scenario. In this scenario, you need a type of tag that will enable you to detect the theft of a DVD. You need to use a tag that can be turned on or off depending upon whether an item has been purchased or not. EAS tags, not SAW tags, will serve the purpose. SAW tags use low-power RF waves in the 2.45 GHz frequency range. SAW devices are widely used in cell phones, color televisions, and so on.

 

You should not use active tags in this scenario. Active tags have a large storage capacity and enhanced information processing power. Therefore, active tags can be used to track high-value goods that need to be monitored over long ranges. Active tags are also used in RFID solutions that require large storage and advanced functionalities, such as installing temperature sensors on aircraft parts to monitor the carriage of perishable goods. In this scenario, you need a tag type that can be turned on or off depending on whether an item has been purchased.

 

You should not use passive tags in this scenario because you need a tag type that can be turned on or off depending on whether an item has been purchased. EAS tags will serve the purpose.

 

Reference:

 

RFID Essentials, Chapter 3: Tags, Information Storage and Processing Capacity p. 67-71.

 

RFID Journal, Boeing, FedEx Test Active UHF Tags, http://www.rfidjournal.com/article/articleview/2351/1/1/

RFID Journal, Frequently Asked Qusetions, RFID Tags, http://www.rfidjournal.com/faq/18/68

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