A vicarity card, also known as an active card, is an RFID-based access control system that is used to open gates and pay tolls. They do not require the driver to get out of their car and scan the card from the driver’s seat. The vicarity type of card is useful for toll roads and security gates, but has one disadvantage: the battery will run out after two to seven years.
Active tags
RFID tags operate at set frequencies from 433 MHz to 5.6 GHz and can detect objects up to 750 feet away. They are expensive and require regular maintenance. They are most commonly attached to expensive items. RFID tags can be passive or active. Here are some of their benefits. Active tags are more accurate than passive tags, but both types are more expensive. This is one reason why they are not widely used for vehicle access.
The main difference between passive and active tags is their power source. Passive RFID tags are powered by radio waves from RFID readers, while active RFID tags use batteries. Active tags emit a signal continuously or periodically, and they are best used for location tracking. Active tags are more sensitive and can extend their read range and signal strength. The battery life of an active tag is greater than passive tags. Active tags can be used in a variety of applications.
Passive tags
A passive RFID tag is a tag with embedded RFID capability that is triggered by an RF signal from an RFID reader. The RFID reader sends the energy to the tag’s antenna, which in turn converts it into an RF wave. The RF wave is then transmitted into the read zone. The tag’s internal antenna gathers energy and moves
to its chip, which powers the reader’s IC. The chip in turn produces a signal that the reader interprets as backscatter.
The main types of active tags are transponders and beacons. The former “wakes up” when the reader sends it a signal. The latter is more powerful than a passive tag and allows it to work in dual mode to take advantage of the advantages of each. The latter has the advantage of reducing the need for centralized databases. Passive tags can be as small as an insect in research situations.
Metal-mountable tags
The performance of metal-mountable RFID Vicinity Type tags depends on their antenna. The tag antenna must be matched with the chip’s impedance to achieve the best transmission coefficient. This conjugate matching will ensure that the maximum energy will be transmitted from the antenna to the chip when a reader makes an inquiry. Aside from antenna manufacture, tag package also includes performance testing and chip bonding. Frequency tuning can reduce differences in chip and substrate materials.
A simple equivalent circuit model has been developed to determine the impedance of a 3D PILA. The antenna prototype was then measured in a controlled anechoic chamber to determine its resonant frequency. Measurements of the antenna prototype compared to simulations showed good agreement. The antenna prototype achieved a read range of 3.6 m inside the anechoic chamber. In addition, the proposed tag can achieve a maximum read distance of 18 m at a transmission power of 31.5 dBm at 867 MHz.
Proximity tags
RFID proximity type labels are a type of label that utilizes radio frequency identification (RFID) technology. They can identify people and objects. These labels are made of durable PVC and can work with any standard UHF Gen 2 systems. In addition to identifying people, proximity type labels can also be used for returns, recalls, and recycling. This article outlines some of the advantages of RFID Label proximity type labels and how to use them in your organization.
Because of their unique characteristics, RFID tags contain a unique code that must be recognized by an RFID reader or access control system. The frequency of these tags is determined by the manufacturer and must be compatible with the system used to monitor inventory. A common example of a standardized air interface is the EPC Gen 2 standard, which provides basic compatibility between a tag and a reader. The reader uses a selected frequency with a specified communication protocol to transmit and receive data.