Keonn Advantenna-SP11: RFID UHF High Gain Antenna

Radio Frequency Identification (RFID) refers to a wireless system comprised of two components: tags and readers. The reader is a device that has one or more antennas that emit radio waves and receive signals back from the RFID tag.

RFID antennas are an extensive of RFID readers. They are responsible for transmitting and receiving radio frequency signals that interact with RFID tags. In the case of RFID handheld and some all in one devices, the RFID antenna(s) are encased in the same structure.

When choosing the right RFID antenna for your application, you may want to take into consideration the polarization of your antenna. This can have an effect on the performance of your RFID read zone. A circular polarized RFID antenna emits electromagnetic waves in a spiral motion. Antennas can have a right hand circular polarization or a left hand circular polarization. Right or left determines the direction of the spiral.

Whereas linear polarized antennas must be aligned directly to the RFID tag to perform at optimum levels, circular polarized antennas have a constantly rotating field that provides a wider bandwidth for picking up tags. This wider bandwidth, however, also means that the read range will be a bit shorter than that of a linear polarized RFID antenna. Circular polarized RFID antennas are ideal for situations where a wide variety of RFID tags on different surfaces need to be read in a smaller amount of space.