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As you learned in 3, tags come in three basic types: active, passive, and semi-passive These tag types differ mainly by their read range and cost Active tags have long read ranges and high prices compared to passive tags Semi-passive tags fall somewhere in between, depending on their design and capabilities Therefore, if you were trying to read over a great distance beyond a passive tag s capabilities and you could not justify the cost of an active tag that would offer even greater distance, you should select the semi-passive technology Active tags are typically used in real-time locating system and can read from hundreds of feet away Active tags are expensive relative to passive tags Passive tags are used when a low-cost, high-volume solution is needed to track items at relatively short distances Semi-passive tags are used when you need a slightly longer read range and perhaps sensors that will record temperature, vibration, shock, humidity, and other environmental parameters Significant read range differences exist among the different frequencies used for active tags Generally, an active tag s read range increases with decreasing frequency used (if the interrogator- and tag-transmitted power stays the same) The longer the wavelength, the farther the wave will propagate depending on available power For instance, a tag operating at 433 MHz will achieve a farther read than a microwave tag using the same power output The data transfer speed capabilities of various frequencies apply to active tags as they do to passive tags
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CHAPTER 6 Design Selection
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Recent advancements include UHF near-field technologies, which are changing much of the accepted UHF tag capabilities UHF near-field tags provide read ranges from 1 to 3 feet and good performance around metals and water with high data transfer rates This text was written in support of the RFID+ Certification Exam, which does not include data pertaining to this technology since it was not available at the time the exam was written At this point in the process, a frequency should have already been selected for the particular application you are designing Given the varying read ranges of tags with different technologies and different frequency ranges, you ll find a large variety of tags on the market Your choice will dramatically narrow once the frequency selection process has occurred
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Knowing the conditions to which the tagged products or objects will be exposed as they are being interrogated can dramatically assist you in making decisions regarding the tags as well If you are choosing tags for use in outdoor applications, for example, a rugged tag that can be exposed to temperature extremes, direct sunlight, and rain should be chosen If your operation moves goods in and out of a freezer during the handling process, then the tags must be able to withstand wide temperature variation and possibly humidity Tag manufacturers will provide datasheets for their tags, which will specify all of the environmental conditions in which the tag can operate In specific applications, the only way you ll be able to find the right tag will be to test it in the appropriate scenario Consider sterilization, for example a process used in both produce and pharmaceutical markets Some types of sterilization will destroy standard tags, and tag manufacturers may not know whether your process (such as irradiation, high-pressure washing, or high-temperature steam cleaning) will affect a product or not In such a scenario, you should ask the tag manufacturer for sample tags that you can run through the process in question to validate the tags endurance and survivability
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The tag s data transfer rate requirement is driven by how much time the tag can spend in a particular read zone or how much data will need to be read from or written to the tag The data transfer rate increases as the frequency of the system increases Low frequency has the slowest data transfer rate; microwave has the highest data transfer rate
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