What are the different types of UHF RFID antennas?
Many different devices use radio frequency identification (RFID) to communicate at short distances. RFID units are able to transmit on various radio frequencies; However, many countries, including the United States mandate, can only be used by the range of ultra -high frequency (UHF). There are four common types of UHF antenna design. All of them can be used to transmit UHF data, but each antenna design has a specific advantage.
RFID systems consist of a tag or label and data reading antennas. The labels are able to transmit the inserted information when they are close enough to the antenna. To ensure efficient data transfer, antennas and brands are specially designed to work on one specific radio frequency.
browsing the rectangle UHF RFID is designed to cover a relatively large area. In this design, the antenna wires form a wide circuit with square corners. In order to detect RFID marks, the rectangle opening must go through. These types of antennasY UHF RFID can be used in the door where people naturally move through the center of the opening. The sensor for the detection of stolen goods when a person leaves the building is one of the common applications of this antenna design.
The antenna RFID can also be arranged in a circular loop structure. This type of setting uses two circular loops of antenna wire that are located by a slight distance from each other. When the mark is around both antennas, the time difference between two wires can be recorded. Comparison of the order and delay of data from twins antennas allows the RFID reader to calculate the direction and speed that the object travels. This information can be useful in factor or other installation with different moving parts.
PASS OVER LOOP is the type of UHF RFID antenna, which is optimized for scanning marks located on a flat horizontal surface. As a passage through a rectangular design, only one wire that makes a loop that makes a loop that makes upThe circuit. This design does not require the brand to move through the center opening. Instead, the RFID data can be read when the antenna loop comes to a very close proximity to the brand. This design is optimized for short -bottom scanning tasks such as indexing books that spread on the table.
The fourth type of UHF antenna RFID is a loop passage. This design is basically the same as the passage loop, with the exception of the antenna wire is turned into a vertical orientation. The Pass antenna on the loop is used to collect data from RFID, which intentionally ran around the wire. The security card reader is one of the most common applications for this antenna layout.