Access Control RFID

Radio Frequency Identification (RFID) uses radiofrequency waves to identify and track a variety of objects accurately.  A microchip with an antenna, a reader with an antenna, and an access control server are all included in most RFID systems.

The data contained on the tag is cross-referenced with the RFID system’s database. If the information is accurate, access is granted.

How Does RFID Access Control Work?

AS MENTIONED PREVIOUSLY, an RFID access control system typically consists of a tag, a reader with an antenna, and an access control server.

The card reader constantly radiates a radiofrequency energy field. As a response, when the card enters the area, the Radio Frequency field energizes a copper wire aerial inside the card. The card’s smart card chip is connected to the wire.  The chip’s ID number and any other data collected on the card, such as a unique customer or facility code, are supplied by the aerial inside the card.


A microprocessor, an antenna, and a substrate are the three significant aspects of RFID tags. The tag’s microprocessor stores and processes data, along with modulates and demodulates radio-frequency signals. The tag’s antenna enables it to receive and transmit information.

The power supply of RFID tags could be used to differentiate them. Passive and active tags are the two major types of tags used in the access control industry.

Difference between Passive and Active Tags

Because a passive RFID tag does not have a battery, the reader’s electromagnetic waves are nabbed by the tag’s built-in antenna.  These tags are less expensive than active tags and thus could be a cost-effective solution for businesses on a tight budget.  They are also smaller because they do not require a battery.  They do, however, have their limitations. Because passive tags don’t have their power source, they need more time to charge before sending information. In contrast to active tags, they also have fewer data storage capacity.

Active RFID tags feature a built-in battery that continually transmits the data stored on them to the reader.  Even though their batteries have a limited lifespan, they frequently endure for years. Tag’s battery-powered reaction makes it perfect for scenarios where RF signals are likely to be tampered with.

SafePassage offers vehicle recognition using automated license plate recognition (ALPR or ANPR). Apartments and HOA’s can use our ALPR on their residential and visitor lanes to replace more expensive outdated technologies like RFID.  Our ALPR will use the license plate number to authorize residents and visitors to access a community quickly.