RFID Tunnel

An RFID tunnel (also known as an RFID reading tunnel or UHF RFID tunnel) is the right choice if you want to capture large numbers of RFID-tagged items quickly, automatically and consistently – without manual scanning. Thanks to a shielded, defined reading zone, RFID tunnel systems read reliably even at high throughput rates and do not produce cross-reads (unwanted reads outside the desired area).

As an RFID consortium, we supply you with the RFID tunnel, including design, hardware and integration into your conveyor systems and process IT – with SmartMove as a software module for events, plausibility checks, data transfer and evaluations, if required.

We will provide you with a clear, practical assessment of:

• Feasibility & typical read rate under your conditions
• Optimal tunnel geometry, antenna layout & triggering
• Integration with WMS/ERP/MES and process events (WE/WA/QS)
• Recommended PoC setup (so you can quickly obtain reliable figures)

An RFID tunnel is a station located along a material flow – often in combination with a conveyor belt, roller conveyor, chutes or overhead conveyor systems. Essentially, it consists of:

• A mechanical enclosure/shield (which defines the reading area),
• An RFID reader (typically UHF/RAIN RFID),
• Several antennas (and, where applicable, couplers/amplifiers depending on the setup),
• Trigger sensors (e.g. photoelectric sensor/encoder/PLC signal),
• And a software logic that derives a valid, verified result from many individual readings

Objective: Items, boxes, containers or sets are automatically identified, checked (for completeness, allocation, orientation and timing) and then transferred to the WMS/ERP/MES.

A tunnel really comes into its own where you need a controlled read zone:

• Confined production environments or areas close to production lines where unauthorised access is a critical concern
• High throughput with multiple tags per unit (box/container/set)
• Quality assurance / completeness check (“Is everything that should be there actually there?”)
• Goods Out / Dispatch Control: When Loading Errors Are Costly
• Standardised material flow: defined positioning, reproducible measurement conditions

In contrast, open-antenna setups (e.g. positioned to the side of a conveyor belt) are often quicker to set up, but are more susceptible to interference, cross-reads, shielding and ‘inconsistent’ results – particularly with complex packaging units or in environments containing a lot of metal or liquids.

• Automatic identification of cartons/containers
• Mapping and reconciliation against order lines
• Timestamps & audit trail (“when did what arrive?”)

• Comparison of picking list vs. actual contents
• Confirmation prior to loading (Gate/tunnel combination possible)
• Rejection in the event of discrepancies (missing part/extra part/incorrect set)

• Set formation: “Which components belong together?”
• Validation rules: permitted/unpermitted combinatio
• Documentation & Traceability (Audit Trail)

• Identification of trays/containers/load carriers
• Transfer to MES for proper process control
• Automatic postings at process stages

In practice, it is usually these factors that determine whether an RFID tunnel operates reliably:

• Shielding & Geometry: The tunnel defines the reading area and minimises stray readings.
• Antenna layout: The position, polarisation, number and radiation pattern are selected so that even ‘difficult’ tags are detected.
• Triggering: The reading process starts/stops precisely when the object is within the reading range (light barrier, encoder, PLC signal).
• Feasibility: Software rules filter out outliers, count reliably, identify trends and assign units.
• Validation: A proof of concept (PoC) or acceptance test using real products is the quickest way to obtain reliable metrics.

Important: Reading rates and throughput always depend on the type of tag, the material, the packaging method, the conveyor system, the environment and process discipline. This is precisely why we do not design tunnels as ‘off-the-shelf’ solutions, but rather tailor them to the specific process.

Many solutions fail not because of the act of reading itself, but because of the question: Which interpretations are considered ‘true’ – and what happens in the process? This is precisely where our integration logic comes into play.

With a middleware layer (e.g. AutoID SmartMove), you can, among other things:

• Group read events into object-related results
• Check completeness against picklists/ASN
• identify incorrect combinations or missing parts
• Transfer results to WMS/ERP/MES (including timestamp, location, line)
• Handling error cases efficiently (ejection, rework, re-scan station)

This turns ‘lots of daily reads’ into a clear business event such as:
“Box X complete, cleared for dispatch” or “Set Y incomplete, rework required”.

Practical benefits: In critical areas, audible alerts are often the most reliable; when combined with traffic-light logic and monitor status, this creates a system that really works in day-to-day use.

Every application is different – just like the ideal solution:

• RFID gate: ideal for passageways and access points (e.g. pallets, forklifts, gateways).
• RFID tunnels: ideal for defined scan channels on conveyor systems, hanging goods and quality control stations – particularly where cross-reads are critical.
• 360° barcode tunnel: a strong alternative when barcodes are more cost-effective or a hybrid system (RFID + barcode) makes sense.

• Hardware + Integration: You don’t just get components; you get a fully operational workstation integrated into your process.
• Process understanding: Goods Receipt/Goods Issue, Quality Assurance, Track & Trace – we take a holistic approach to systems.
• Practical: Our RFID tunnels are designed to deliver reliable results under real-world conditions – e.g. to prevent cross-reading
• Scalable: From the first tunnel to a fully integrated RFID process chain (additional stations, modules, data flow).

If you are planning to install an RFID tunnel (goods-in, goods-out, quality assurance or production), the most efficient way to start is with a brief process review:

• Which units are passing through?
• Which quality needs to be ‘demonstrated’ (completeness, direction, timing)?
• Which systems should post automatically?

On this basis, you will receive clear recommendations regarding architecture, triggering, software rules and integration – including realistic guidelines on what can be reliably achieved under your specific conditions.