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ag performance is measured using many different parameters, including read rate, read distance, yield, and consistency All these parameters are affected by tag design, tag manufacturing processes used and quality control during manufacturing, tag orientation, tag placement, material tagged, tag motion
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in the IZ, and environmental characteristics of the IZ With so many variables affecting tag performance, it is difficult to evaluate tag performance It requires expertise in electromagnetic wave communication and a proper test design and setup The following sections discuss the effects of various parameters on tag performance With the current manufacturing processes, tag quality can vary from one batch to the next or even from one tag to the next This makes it difficult to extrapolate results of tag tests to a larger population of identical tag types The best way to deal with this situation is to test several tags and average of their performance This, of course, makes tag testing a tedious and resource-intensive activity
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RFID tags may be powered by an on-board battery or by an external power source The external power is usually delivered via magnetic flux or radio waves The magnetic flux creates a uniform density zone, allowing tags to be powered consistently within the zone Radio waves, used by UHF and microwave tag, create a zone of radio signals that is affected by reflected waves from surrounding objects The field density varies unpredictably within the zone Therefore, depending on the tag location within the zone, the tag may or may not receive strong enough radio waves to power itself The active tag with an on-board battery transmits radio waves with a consistent strength, except when the battery strength decreases The battery power may decrease because of normal power drain or due to low temperatures In subfreezing temperatures, battery efficiency greatly decreases, which may cause the active tags to transmit signals with such a low strength that the interrogator may not receive a strong enough signal to extract data, making the tag unreadable
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Tag performance is affected by the orientation of the tag relative to the interrogator antenna The best tag orientation occurs when the tag plane and the antenna plane are parallel to each other At this orientation, the tags receive the maximum power As the tag is rotated, it presents a smaller effective area to the incoming radio waves and thus collects less power The tag read range decreases as the collected power decreases Most passive UHF tags have a single dipole antenna that has nulls along its north and south poles This type of tag cannot be read when the axis passing through the poles of the antenna is perpendicular to the plane of the interrogator
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antenna Two options are available to remedy this situation: install two interrogator antennas one perpendicular to the other so the tag antenna axis is not perpendicular to the plane of at least one of the interrogator antennas Or, use tags with two dipole antennas (a dual dipole tag), with one antenna perpendicular to the other The axis of at least one of the two antennas on this tag will never be perpendicular to the interrogator antenna plane The location of the tag within the IZ also affects the tag s performance As the tag moves away from the interrogator antenna, it receives less and less power The reflected signals mixing with the original signal further reduces the power available to the tag At the outer edges of the IZ, signal strength may decrease in pockets to such a low degree that the tag may not be powered and the consistency of the tag read decreases
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