If you’ve adopted technology in your business, you must have found yourself in the passive vs. active RFID wristbands quagmire. This is because the technologies have a similar working mechanism, but with a few functional differences that can affect their cost and efficiency.
In this article, we explain these differences and help you pick the right one for your business. We ensure that you do not pay for RFID capabilities you don’t need or, worse, have a system that cannot perform as expected. Read on.
Passive vs. Active RFID Wristbands: What are the Differences?
Passive RFID wristbands are less costly, small-sized, and lack a battery component. They operate when activated by a reader, making them ideal for access control, event entry, and short-distance identification purposes.
On the other hand, active RFID wristbands have a battery pack, meaning that they function independently without relying on power from a reader. This allows them to perform better when it comes to long-range identification, real-time monitoring, and additional data handling, but they tend to be larger, more expensive, and require battery management.
Why Passive RFID Wristbands Are Best for Events
Passive RFID wristbands have proven to be the best options in event management since they are both cheap and reliable. For starters, these wristbands do not need any batteries since they have two components only: the microchip and antenna coil. Therefore, these wristbands can be manufactured easily and in large quantities.
This system operates through an interaction between the wristbands and the reader device. As soon as the wristband comes into contact with the reader, the reader broadcasts electromagnetic energy. This energy gets into the wristbands where the antenna captures it and transfers it to the chip. The chip then gets activated and sends a unique identifier signal to the reader. When the wristband moves out of the field of the reader, it turns off completely.
In events such as concerts, music festivals, sports matches, conferences, or trade shows, organizers require thousands of wristbands. Being cheaper, passive RFID technology makes sense because it can significantly decrease the costs when wristbands are issued to many people. It does not include a battery, so there is no need for recharging. There is also no need for changing batteries and the fear of losing one’s access rights due to a dead tag is gone. Moreover, being quite robust, passive RFID technology can work well after prolonged use despite bad weather conditions.
It also makes sense from the perspective of security. Usually, high-frequency (HF) and near-field communication (NFC) passive wristbands have a very short range of operation, ranging from several centimeters. This means that a person should hold their wristband directly to the reader. It helps to avoid accidental read operations and provides additional safety when it comes to checking the wristband or making a payment.
Flexibility is another advantage that events gain from choosing passive wristbands. They can make them into single-use wristbands or reusable silicone wristbands for multi-day events. The actual tag itself will not wear out easily since it contains no battery or moving parts. Therefore, passive RFID is ideal for temporary or ongoing events alike that require reliable identification tools.
Its drawback is the limited range.
Passive RFID tags work most efficiently in close proximity to a reader. Even though UHF passive tags are able to transmit further away compared to HF and NFC, their range still cannot compare to an active RFID tag in terms of broadcasting capabilities in real time. Nevertheless, this is not a concern for most events, as what they need above all else is a quick and cost-effective form of identification.
Active RFID Wristbands: How They Work & When to Use Them
In active RFID wristbands, there is a chip, antenna, and internal power source. The internal power supply keeps the tag powered up.
Hence, it can transmit its signal intermittently even without a reader close by. This is the reason that active RFID tags have a read range far greater than those of passive RFID tags, usually ranging from 30 to 100 meters, and sometimes even up to 300 meters.
When to consider using active RFID:
- Tracking over great distances like those found on festival grounds, resort complexes, building sites, or sports routes.
- Long-distance automated reading.
- Monitoring high-value items including machines, vehicles, or sensitive medical equipment.
- Racing and sports time tracking where quick and effective detection is important while participants pass by timers.
- Emergencies and safety use requiring location information on site when the crowd must be evacuated or assembled.
However, active RFID wristbands are more expensive than passive ones. Also, they are big and bulkier, making them hard to handle. Only use them when tracking over a distance and real-time monitoring but not for inexpensive event access or control of entry.
Semi-Passive (Battery-Assisted Passive): The Compromise Solution
There is a third choice available that represents a compromise solution between the two extremes above: semi-passive or battery-assisted passive (BAP) tags.
The semi-passive tag contains a tiny battery that supplies the energy needed to power the chip processing, while still using the electromagnetic field generated by the reader to establish communication.
The battery does not provide a constant broadcast, only allowing the chip to respond faster and more reliably over a marginally increased distance than would be possible with a purely passive tag.
The semi-passive tag is appropriate for:
- Extreme environments (freezing temperatures, highly metallic surroundings, or dampness), which might affect the reliable reading of a fully passive tag
- Slightly increased reading distances, without the need for a fully active setup
- Specialist logging capabilities; some semi-passive tags can log sensor readings (such as temperature and humidity) outside of reader contact
Semi-passive is often an overkill for the majority of wristband events, but there may be a few specialized applications where it could come in handy, including health monitoring wristbands at multi-day outdoors events, cold chain monitoring of perishable snacks, or even high security access credentials.
Conclusion
Your answer to passive vs. active RFID wristband depends on your specific needs. This article has summarized when you can use each, and introduced a middle ground: semi-passive RFID wristbands.
To recap, passive RFID wristbands should be your first pick if you are an event planner looking for economical, reliable, easy to install wristbands that are perfectly suited to applications such as access control, tickets, and cashless payments.
The best solution to use in scenarios where long-range vision is required would be active RFID wristbands. Contact us for customized RFID wristbands, made to meet all your needs hassle-free!
