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The tag antenna is the conductive element that enables the tag to send and receive data.
Passive, low- (135 kHz) and high-frequency (13.56 MHz) tags usually have a coiled antenna that couples with the coiled antenna of the reader to form a magnetic field.
UHF tag antennas can be a variety of shapes. Readers also have antennas which are used to emit radio waves.
The RF energy from the reader antenna is "harvested" by the antenna and used to power up the microchip, which then changes the electrical load on the antenna to reflect back its own signals.
Word Entries containing the term:
1. In technical terms, the gain is the ratio of the power required at the input of a loss-free reference antenna to the power supplied to the input of the given antenna to produce, in a given direction, the same field strength at the same distance.
Antenna gain is usually expressed in decibels and the higher the gain the more powerful the energy output. Antennas with higher gain will be able to read tags from farther away.
2. The conductive element that radiates or receives energy in the radio frequency spectrum to and from the tag.
A UHF reader that emits radio waves in a circular pattern.
These antennas are used in situations where the orientation of the tag to the reader cannot be controlled.
Since the waves are moving in a circular pattern, they have a better chance of hitting the antenna, but circular-polarized antennas have a shorter "read range" than linear-polarized antennas.
delta matched antenna, Y antenna (s) (noun)
; delta matched antennas, Y antennas (pl)
In electricity, a single-wire antenna to which the leads of an open-wire transmission line are connected in the shape of a Y.
electrostatic error, antenna effect, vertical component effect
A distortion of the directional properties of a loop antenna caused by an input to the direction-finding receiver which is produced between the loop and the ground.
This is the opposite of that which is created between the two terminals of the loop.
A UHF antenna that focuses the radio energy from the reader in a narrow beam.
This increases the read distance possible and provides greater penetration through dense materials.
Tags designed to be used with a linear polarized reader antenna must be aligned with the reader antenna in order to be read.
A small square reader antenna made from a solid piece of metal or foil.
In electromagnetism, an antenna having the shape of a sphere, used primarily in theoretical studies.