HF Antenna —
Standard

Our anchor product. A 25×25mm HF antenna with verified superior read range over the market standard — developed and field-validated in a 3-phase induction charger for commercial food service. Drop-in replacement for existing 25×25mm designs with measurably better performance.

↑ Superior read range — tested Available now Field-validated · CFS induction charger

Request samples → Get a quote

PCB assembly — embedded electronics manufacturing

Quick reference — TNX-A01

Frequency13.56 MHz

Dimensions25 × 25 mm

Cable length500 mm

ConnectoruFL

SubstrateRigid PCB

Impedance50 Ω

ProtocolsISO 14443 · 15693 · NFC

Op. temp.−20 °C to +85 °C

Read range↑ Superior (measured)

Matched readerTNX-R01

Specifications

Complete electrical & mechanical specifications

Electrical
Operating frequency	13.56 MHz ± 7 kHz ISM band, worldwide operation
Impedance	50 Ω nominal
Return loss (S11)	< −15 dB at 13.56 MHz Measured with uFL connector, 500mm cable terminated
Q factor	Available on request Measured data supplied with sample units
Supported protocols	ISO 14443-A, ISO 14443-B, ISO 15693, NFC Forum Types 1–5 Validated with ST25R3916 (TNX-R01), PN532, MFRC522
Read range	Superior to market standard — see Performance section Measured against comparable 25×25mm HF antenna at identical reader output power
Mechanical
Antenna dimensions	25.0 × 25.0 × 0.8 mm
Substrate	FR4 rigid PCB, 1.6 mm nominal RoHS compliant, lead-free
Cable type	50 Ω coaxial, 500 mm ± 5 mm
Connector	uFL (IPEX MHF1 compatible) Custom cable lengths and SMA connector variants available on request
Mounting	Adhesive pad (pre-applied) or M2 screw holes (2×)
Weight	~3.2 g (antenna + cable)
Environmental
Operating temperature	−20 °C to +85 °C
Storage temperature	−40 °C to +105 °C
IP rating	IP52 (antenna body) Suitable for food service splash environments
Humidity	5% – 95% RH, non-condensing
RoHS compliance	Yes — RoHS 3 (EU 2015/863)
Ordering
Part number	TNX-A01
Minimum order quantity	10 units (sample); 100 units (production)
Standard lead time	6–8 weeks from order confirmation
Custom variants	Cable length, connector type, form factor — contact us

Performance

Read range & electrical characterization

Read range comparison — ISO 15693 tag, ST25R3916 reader, 100 mW output

TNX-A01

88 mm

Market std.

64 mm

TNX-A01

76 mm

Row 3: ISO 14443-A tag (MIFARE Classic 1K)

TNX-A01

Market standard 25×25mm

Test conditions: reader output 100 mW, 20 °C ambient, tag centered on antenna axis. Results repeatable across 5 antenna samples. Full test report available with sample units.

Return loss (S11) — 10 MHz to 20 MHz sweep

S11 plot included with
datasheet package

Peak return loss: < −15 dB
@ 13.56 MHz

Request sample units for
full characterization data

Impedance measurement performed with a vector network analyzer. S11 data and impedance plots supplied with every sample order and available in the datasheet package.

Validated reader ICs

ST25R3916 (TNX-R01) PN532 MFRC522 CR95HF NXP PN5180 AS3953

Best performance achieved with TNX-R01 (ST25R3916 based) — pre-matched and characterized as a pair. Contact us for data with other reader ICs.

Application note

Field deployment: CFS 3-phase induction charger

⚡

Proven in production

3-phase induction charger — commercial food service

The TNX-A01 was developed to solve a real problem: existing 25×25mm HF antennas did not deliver reliable object identification across the full operating distance of a 3-phase induction charging platform for commercial food service equipment. Our improved coil geometry extended read range by over 37% versus the previous antenna, eliminating false negatives at the edge of the charging zone.

Challenge

Insufficient read range from standard 25×25mm antenna causing missed detections at maximum charger operating distance.

Solution

Proprietary coil geometry optimization within the same 25×25mm form factor. No PCB redesign required. Drop-in replacement.

Result

Measurably superior read range vs. standard 25×25mm catalog antennas — measured at identical reader output power. Validated in production deployment.

Integration note: For induction charging applications, ensure the antenna is mounted with its coil plane parallel to the charging surface and the object tag. Ferrite shielding behind the antenna is recommended when mounting against metallic chassis. Contact us for application-specific guidance.

Companion products