RFID technology (Radio Frequency Identification) makes it possible to automatically recognise an object, a vehicle or a person by means of radio waves, without physical contact and without a direct line of sight between the tag and the reader. It originated in military and logistics settings, but today it is one of the most widespread technologies in access control: it opens car park barriers, office doors and venue turnstiles in milliseconds, even in the rain, at night or with the vehicle in motion. Understanding how it works, which types exist and what its limits are is key to choosing the right access solution for a facility.
An RFID system consists of three elements: a tag or label (a microchip attached to an antenna), a reader with its own antenna, and software that interprets the information and decides what to do with it. In access control, the whole process boils down to four steps:
It all happens in a fraction of a second, and the user does not have to hold anything up to anything. That is the big difference compared with barcodes or QR codes: no line of sight is needed, and the reader can identify the tag through plastic, glass or dirt.
The operating frequency determines the read range, the speed and the type of application. Three main bands coexist in access control:
| Band | Frequency | Typical range | Common use in access control |
|---|---|---|---|
| LF (low frequency) | 125–134 kHz | Up to 10 cm | Classic proximity cards and key fobs for doors and time clocking. A veteran technology: inexpensive, but with weak security. |
| HF (high frequency) | 13,56 MHz | Up to 10 cm | Smart cards (ISO/IEC 14443 and 15693 standards, MIFARE family) and phone NFC. Supports encryption and is the benchmark for pedestrian access. |
| UHF (ultra-high frequency) | 865–868 MHz in Europe | Several metres (up to about 10 m with passive tags) | Long-distance vehicle identification: windscreen or headlight labels that open the barrier without the driver having to stop. EPC Gen2 / ISO/IEC 18000-63 standard. |
The rule of thumb is simple: the closer the read, the more control; the longer the range, the smoother the flow. That is why pedestrian doors usually work in HF, where the user deliberately brings the card up to the reader, while vehicle access has shifted towards long-range UHF.
Besides frequency, tags differ in how they obtain their energy:
| Tag type | How does it work? | Advantages | Common use |
|---|---|---|---|
| Passive | No battery. Powered by the field the reader emits. | Cheap, lightweight, maintenance-free and with a practically unlimited service life. | Cards, key fobs and adhesive windscreen labels in UHF. |
| Active | Has its own battery and transmits its own signal. | Longer range and more stable reading in difficult conditions. | Long-distance vehicle access, fleets and logistics areas. The battery has to be replaced every few years. |
In most car parks, the passive UHF tag has become the norm: it offers several metres of range, costs little per unit and requires no maintenance. Active tags are reserved for cases where distance or the environment justify them.
RFID is not a new technology, but several factors have accelerated its adoption over the past decade, especially in vehicle access:
On top of this comes an underlying trend: the sector is moving towards ticketless facilities, where the regular user is identified automatically and paper is reserved, at most, for the occasional visitor.
RFID does not compete alone. Each technology identifies something different and has its own strengths:
| Technology | What does it identify? | Strength | Weakness |
|---|---|---|---|
| UHF RFID | The credential (tag) | Long-range reading, hands-free, stable in bad weather | The tag can be moved to another vehicle if it is not tamper-proof |
| Number plate recognition | The vehicle | No credential needs to be issued | Sensitive to dirty, damaged or poorly lit number plates |
| QR or barcode | The ticket or booking | Ideal for one-off visitors and online bookings | Requires stopping and presenting the code |
| Proximity card (LF/HF) | The credential | Cheap and familiar to the user | Requires holding the card up to the reader |
| Facial recognition | The person | Maximum certainty about who is accessing | GDPR and AI Act requirements when processing biometric data |
That is why, in demanding facilities, it is common to combine technologies: UHF RFID for the recurring season-pass holder, plate reading as a second factor or for users without a tag, and QR for visits and bookings. The management system unifies all entry routes in a single database.
The versatility of RFID technology means it can be adapted to very different user profiles and types of facility:
It depends on the technology. The oldest 125 kHz LF cards transmit their identifier unencrypted and can be copied with low-cost equipment. The same is true of some generations of HF cards whose encryption is now considered vulnerable. Current credentials with AES encryption and mutual authentication between tag and reader raise the level of protection considerably.
In UHF vehicle access, the most common risk is not cloning but the tag being peeled off and moved to another car. To prevent this, tamper-proof labels are used, which are destroyed if someone tries to remove them, and RFID reading can be combined with plate reading as double validation.
A tag’s identifier, on its own, is just a number. But as soon as the system links it to an employee, a season-pass holder or a resident, it becomes personal data subject to the General Data Protection Regulation. This obliges the operator to inform the user, define the purpose and retention period of access logs, and guarantee users’ rights.
Unlike facial recognition, RFID does not process biometric data, so it does not fall under the special category in Article 9 of the GDPR or the high-risk regime of the AI Act. In addition, the European Commission published a specific recommendation on privacy in RFID applications that advises carrying out impact assessments and clearly signposting reading points. In practice, it is one of the easiest access technologies to deploy with legal safeguards.
NFC is a subset of high-frequency RFID (13.56 MHz) designed for very short-range communication, of a few centimetres. It is the technology phones use to pay or to act as an access credential. All NFC is RFID, but not all RFID is NFC.
It depends on the frequency and the type of tag. With LF and HF, a few centimetres. With passive UHF, several metres, which makes it possible to identify a vehicle before it reaches the barrier. With active tags, the distance can be even greater.
Yes. Radio-frequency reading does not depend on light or visibility, so it stays reliable in conditions where a camera may fail. Only metal objects or some heat-reflective windscreens can attenuate the signal, which is solved by placing the tag correctly.
If it is a tamper-proof adhesive tag, no: it is destroyed when you try to peel it off. If a space needs to be shared between several cars, removable tags or solutions based on combining tag and plate are available.
Yes. Solutions such as the Meypar long-range TAG identify the vehicle from a distance and open the barrier automatically, without the driver having to stop or take out a card.
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