UHF RFID for Warehouses, Dock Doors & Portals
Plan RFID for warehouse management: fixed readers and circular antennas at dock doors, conveyor tunnels, handheld cycle counts and on-metal asset tags.
ValenID · valenid.com · sales@valenid.com
AN-140 2 dBi Mini Ceramic UHF RFID Antenna, 50 × 50 mm
Miniature 2 dBi ceramic patch UHF antenna on a 50 × 50 mm board with 3 m or 5 m SMA lead, for short, contained read zones inside cabinets, slots and counters.
- Ceramic patch (dielectric constant 37) on a 50 × 50 mm board for tight UHF RFID enclosures
- 2 dBi gain for short, contained read zones in cabinet cells, slots and counters
- 50 Ω impedance, VSWR ≤ 1.5 at center frequency
- Narrow –10 dB bandwidth (4 MHz min) tuned to your reader's channel plan
- Frequency temperature coefficient ≤ 20 ppm/°C for stable tuning
- Gain
- 2 dBi
- Board size
- 50 × 50 mm
- Impedance
- 50 Ω
- VSWR
- ≤ 1.5 at center frequency
- –10 dB bandwidth
- 4 MHz min
- Connector
- SMA plug on 3 m or 5 m lead
Reply within 24 hours Tested before dispatch Worldwide shipping
2 dBi Mini Ceramic UHF RFID Antenna, 50 × 50 mm: overview
The AN-140 is a 50 × 50 mm ceramic patch antenna for UHF RFID designs where space is the main constraint: individual cabinet cells, product slots in self-service fridges, checkout pads and compact enclosures. With 2 dBi gain it creates a short, contained read zone rather than a long-range field, which helps when neighboring compartments must not read each other's tags.
The small size comes from a high-permittivity ceramic (dielectric constant 37). The trade-off is bandwidth: the –10 dB bandwidth is 4 MHz minimum, far narrower than a PCB or panel antenna, so each unit is tuned to a center frequency. The ceramic's temperature coefficient is 20 ppm/°C maximum, keeping that tuning stable as the enclosure warms or cools.
The patch sits on a PCB ground plane with corner mounting holes. It has no cover and is not waterproof, so mount it inside a dry housing.
Integration notes
Each antenna ships with a coaxial lead terminated in an SMA plug: 3 m on AN-140-3 and 5 m on AN-140-5. Impedance is 50 Ω with VSWR of 1.5 maximum at the center frequency, so it connects directly to multi-port UHF readers and reader modules. Because the passband is narrow, give us your reader's region and channel plan (for example 865–868 MHz or 902–928 MHz) on the RFQ and we confirm the tuned center frequency before dispatch. Please also confirm polarization and board thickness against a sample before finalizing an enclosure: the datasheet lists RHCP in its electrical table but linear in its ordering table, and gives 5.5 mm and 8.5 mm thickness in different sections.
More features
- Supplied with coaxial lead and SMA plug in 3 m or 5 m lengths
AN-140 specifications
RF performance
| Nominal frequency | 840/940 MHz per datasheet; center frequency confirmed per order |
|---|---|
| –10 dB bandwidth | 4 MHz min |
| Gain | 2 dBi |
| VSWR at center frequency | 1.5 max |
| Impedance | 50 Ω |
| Polarization | RHCP per electrical specification (ordering sheet lists linear; verify on sample) |
Ceramic element
| Dielectric constant | 37 |
|---|---|
| Q × f | > 40,000 GHz |
| Frequency temperature coefficient | 20 ppm/°C max |
Cable & mechanical
| Board size | 50 × 50 mm (±3 mm) |
|---|---|
| Thickness | Listed as 5.5 mm and 8.5 mm in different datasheet sections; confirm on sample |
| Cover | None; not waterproof |
| Connector | SMA plug on integrated coaxial lead |
| Cable length | 3 m (9.8 ft) or 5 m (16.4 ft) |
Cable length options
| Variant SKU | Gain | Board size | Cable length | Termination |
|---|---|---|---|---|
| AN-140-3 | 2 dBi | 50 × 50 mm | 3 m (9.8 ft) | SMA plug |
| AN-140-5 | 2 dBi | 50 × 50 mm | 5 m (16.4 ft) | SMA plug |
Specifications can change between production batches. Confirm the current revision with us before placing volume orders.
Ordering options
Quote the SKU that matches your frequency, interface and mounting. Not sure? Send us your controller model and we will pick the variant for you.
| SKU | Configuration | Actions |
|---|---|---|
| AN-140-3 | 2 dBi ceramic patch UHF antenna, 50 × 50 mm, no cover, 3 m (9.8 ft) coaxial lead with SMA plug | |
| AN-140-5 | 2 dBi ceramic patch UHF antenna, 50 × 50 mm, no cover, 5 m (16.4 ft) coaxial lead with SMA plug |
Where the AN-140 is used
- One antenna per cell in a locker-style smart cabinet so each compartment reads only its own item
- Product slots in self-service fridges and vending-style displays
- Checkout or returns pads that should read only the item placed on them
- Compact UHF enclosures where a 120 mm PCB antenna will not fit
RFID Asset & Tool Tracking
Build an RFID asset tracking system: on-metal, ceramic and tie-on tags matched to each asset, handheld audits, smart cabinets and IP67 HF heads for tooling.
AN-140 FAQ
Is the AN-140 circular or linear polarized?
The electrical specification lists right-hand circular polarization (RHCP), while the ordering sheet lists linear. We confirm the polarization of the batch you order and can send a sample for testing before you commit.
Why does the narrow bandwidth matter?
Its –10 dB bandwidth is 4 MHz minimum, much narrower than a PCB or panel antenna, so the antenna is tuned to one center frequency. Tell us your reader's operating band and channels, for example 865–868 MHz or 902–928 MHz, and we confirm a matching tuning.
What read range can I expect?
No read range is specified, because it depends heavily on reader power, tag type and mounting. With 2 dBi gain the AN-140 is intended for short, contained zones; a sample lets you measure it with your own tags.
Which readers can drive it?
Any UHF reader or reader module with a 50 Ω antenna port. The lead ends in an SMA plug, so readers with other port types need an adapter cable.
Before you buy
Related buyer guides
UHF RFID Frequency by Country: 902–928 MHz vs 865–868 MHz and Other Bands
Compare UHF RFID reader bands by country, including US, EU, UK, China, India and Japan. Understand ERP, EIRP, channel conditions and radio approvals.
How to Wire a Long-Range UHF Reader to an Access Controller or Barrier
Wire a UHF reader's D0, D1 and ground to your controller, match 26/34-bit Wiegand, size 12 V power and trigger the barrier by relay. Diagrams included.
Does RFID Work on Metal? How to Choose On-Metal Tags
Yes, RFID works on metal with tags built for it. See why metal detunes standard tags, compare ABS, PCB, ceramic and label tags, and test read range properly.
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Get pricing for the AN-140
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