What Is A Tag
Passive Tag (0, 1st and 2nd Types)
Passive tags are activated by radio waves emitted from the reader. When radio waves are picked up, they are transformed into energy with which the tags return a signal to the reader.
Semi-Active Tag (3rd Type)
Battery power is consumed by semi-active tags only to low-power digital circuitry or chip functions. Prior to "work mode", these tags are in continuous sleep state similar to passive tags. Power consumption is so minimum that battery life can last as long as 10 years.
Active Tag (4th Type)
Tag power is supplied exclusively by an internal battery. The tags communicate actively with the reader.
ISO Standards
- ISO 18000-1：Standardized reference structures and defined reference parameters
- ISO 18000-2：Low frequency ( up to 135KHz)
- ISO 18000-3：13.56MHz
- ISO 18000-4：2.45GHz
- ISO 18000-5：5.8GHz
- ISO 18000-6：Ultra-high frequency (860 – 960 MHz)
- ISO 18000-7：433MHz
Comparison
| Tag | Passive | Semi-Active | Active |
|---|---|---|---|
| Power | Reader | Reader or battery | battery |
| Battery | No | Yes | Yes |
| Turn-on power | High | High | Low |
| Transmission range | >3 m | 30~100 m | <100 m="" td=""> |
| Data storage | Low | Medium | High |
Purpose of Using Active Tags
Area monitoring and control
- Control and monitoring of cargo movements over long distances or within a large area such as wharf and large intersections
Monitoring of large volume outbound-shipment
- High speed, multiple tag read capabilities
Real-time tracking and control
- Provides more comprehensive real-time monitoring and control capabilities
Large capacity of data storage
- Provides more data and info
