JHCOILS manufactures custom RFID antenna coils according to the approved operating-frequency requirement for your project, coil geometry, dimensions, inductance, resistance, wire requirements, and approved component specification.
We support electronics OEMs and engineering teams that need an RFID antenna coil manufactured around a specific mechanical and electrical requirement rather than selected only from a fixed reference design.
An RFID system commonly includes a reader and a tag or transponder. The tag or transponder includes electronic circuitry for storing or processing information together with an antenna that interacts with the RF field.
In inductively coupled RFID systems, the antenna coil forms part of the electromagnetic link between the components. From a coil-manufacturing perspective, parameters such as operating frequency, inductance, resistance, number of turns, wire diameter, geometry, and available installation space may all form part of the component specification.
JHCOILS manufactures the antenna coil according to the approved component requirements. Final tuning, communication behavior, reader/tag compatibility, protocol compliance, and system performance remain subject to validation in the customer’s complete RFID system. JHCOILS manufactures custom RFID antenna coils for 125 kHz and 13.56 MHz RFID projects based on your approved component requirements.
Use measured coil inductance and the operating frequency to estimate ideal resonant capacitance before reviewing the matching circuit.
Calculate RFID tuning capacitanceVerify chip impedance, circuit loading and the completed antenna assembly.
JHCOILS provides 125 kHz RFID antenna coils for custom RFID equipment and identification projects. Our published 125 kHz product references demonstrate different coil geometries, dimensions, wire diameters, inductance values, and resistance values. For new projects, the final coil structure is manufactured according to your approved drawing and electrical specification rather than limited to an existing reference model.
| Wire type | Magnet wire 0.2mm |
|---|---|
| Inductance at 125KHz | 540uH nominal |
| Coil Resistance | 10.5 Ω ±5% |
| Coil inside diameter | 25mm*30mm(±0.2) |
| Coil outside diameter | 29mm*35mm(±0.2) |
| Coil width | 2.1mm(±0.2) |
| Wire diameter | 0.2mm |
| Wire type | Magnet wire 0.18mm |
|---|---|
| Inductance at 125KHz | 440uH nominal |
| Coil Resistance | 9.8 Ω ±5% |
| Coil inside diameter | 44mm*44mm (±0.2) |
| Coil outside diameter | 47*7mm*47.7mm(±0.2) |
| Coil width | 1.5±0.1 |
| Wire diameter | 0.18mm |
| Wire type | Magnet wire |
|---|---|
| Inductance at 125KHz | 354uH nominal |
| Coil Resistance | 6.6Ω |
| Coil inside diameter | 25.3mm*49.2mm(±0.2) |
| Coil outside diameter | 30mm*53.2mm(±0.2) |
| Coil width | 2.2mm(±0.2) |
| Wire diameter | 0.2mm |
| Wire type | Magnet wire |
|---|---|
| Inductance at 125KHz | 72uH nominal |
| Coil Resistance | 1.9Ω |
| Coil inside diameter | 20.4mm*10.4mm (±0.2) |
| Coil outside diameter | 22mm*12mm (±0.2) |
| Coil width | 3mm |
| Wire diameter | 0.2mm |
| Wire type | Magnet wire 0.2mm |
|---|---|
| Inductance at 125KHz | 690uH nominal |
| Coil Resistance | 10.6 Ω ±5% |
| Coil inside diameter | 40.5mm (±0.3) |
| Coil outside diameter | 45.7mm (±0.3) |
| Coil width | 1.54mm (±0.2) |
| Wire diameter | 0.2mm |
| Wire type | Magnet wire |
|---|---|
| Inductance at 125KHz | 455uH nominal |
| Coil Resistance | 10.5Ω ±5% |
| Coil inside diameter | 5.5mm*35.5mm(±0.2) |
| Coil outside diameter | 40mm*18.5mm(±0.2) |
| Coil width | 2.4mm(±0.1) |
| Wire diameter | 0.2mm |
| Wire type | Magnet wire |
|---|---|
| Inductance at 13.56MHz | 6.7uH nominal |
| Coil inside diameter | 7.4mm(±0.2) |
| Coil outside diameter | 11.3mm(±0.2) |
| Coil width | 0.26mm(±0.1) |
| Wire type | Magnet wire |
|---|---|
| Inductance at 13.56MHz | 5.5uH nominal |
| Coil inside diameter | 17mm(±0.2) |
| Coil outside diameter | 18.5mm(±0.2) |
| Coil width | 0.91mm(±0.1) |
| Wire type | Magnet wire |
|---|---|
| Inductance at 13.56MHz | 6.5uH nominal |
| Coil inside diameter | 22.8mm(±0.2) |
| Coil outside diameter | 26.4mm(±0.2) |
| Coil width | 0.25mm(±0.1) |
| Wire type | Magnet wire |
|---|---|
| Inductance at 13.56MHz | 5.9uH nominal |
| Coil inside diameter | 18.7mm*22mm(±0.2) |
| Coil outside diameter | 22mm*23.2mm(±0.2) |
| Coil width | 0.93mm(±0.1) |
Frequently Asked Questions about Electromagnetic Coils
RFID (radio frequency identification) is the broad technology category. It uses radio waves to exchange data between a tag or card and a reader. “ID card” and “IC card” are common access-control industry terms for two types of contactless RFID credentials, but the names are not universal technical standards.
An ID card usually refers to a low-frequency 125 kHz proximity card that transmits a fixed identification number. It is commonly used for simple access control and attendance systems and is typically read-only or has very limited data capability.
An IC card is a smart card containing an integrated circuit. Contactless IC cards commonly operate at 13.56 MHz and may support read/write memory, authentication, encryption, and multiple applications, depending on the chip and protocol. Some 13.56 MHz cards can communicate with NFC-enabled devices, but only when the frequency, protocol, and access permissions are compatible.
Both types use a chip, an antenna coil, and a compatible reader for contactless identification. The main differences are their usual operating frequency, memory capacity, security functions, and reader compatibility. For a new design, confirm the chip, protocol, target frequency, required read range, and available coil space before selecting or customizing the antenna coil.
RFID is a broad technology used to identify and track objects through radio-frequency communication. It includes LF, HF, and UHF systems operating at different frequencies.
NFC is a specific short-range technology within the 13.56 MHz HF RFID family. It is commonly used for mobile payments, smart cards, access control, and device-to-device communication.
All NFC systems use RFID technology, but not all RFID systems support NFC. For example, a 125 kHz RFID card cannot communicate with a 13.56 MHz NFC-enabled phone. The antenna frequency, chip, reader, and communication protocol must be compatible.
A 125 kHz RFID antenna operates in the low-frequency band. It is commonly used in access-control cards, vehicle immobilizers, animal identification, and other proximity-identification systems.
A 13.56 MHz RFID antenna operates in the high-frequency band. It is commonly used for NFC, smart cards, contactless payments, library systems, and data-exchange applications.
The two types require different inductance values, turn counts, wire or trace structures, tuning components, chips, and readers. A 125 kHz antenna and a 13.56 MHz antenna are therefore not interchangeable.
RFID reading distance does not depend on the antenna coil alone. It is affected by:
LF and HF RFID coils use near-field magnetic coupling, so their reading distance is especially sensitive to coil size, orientation, and tuning. The complete reader, antenna, tag, and enclosure should be tested together under actual operating conditions.
Yes, but the antenna normally requires special design and testing.
Metal near an RFID antenna can absorb magnetic-field energy, change the coil inductance, detune the resonant circuit, and reduce the reading distance. In severe cases, the tag may become unreadable.
Common solutions include increasing the distance between the coil and the metal, adding a suitable ferrite layer, adjusting the antenna dimensions, and retuning the completed circuit. The antenna should always be measured in its final enclosure because different metals and mechanical structures produce different effects.
Common LF and HF RFID antenna constructions include:
Wire-wound coils can provide flexible inductance, dimensions, wire diameter, and lead configurations. Ferrite-core coils are often used when installation space or magnetic-field direction is restricted. PCB and flexible antennas are suitable for thin and highly integrated devices.
The correct antenna type depends on the operating frequency, chip or reader, available space, required reading distance, installation environment, and production volume.
JHCOILS does more than manufacture custom RFID antenna coils. For projects that require further integration, we can also support chip soldering, plastic housing injection molding, component assembly, final product assembly, and inspection before shipment.
This integrated manufacturing capability helps you reduce the number of suppliers involved in your RFID project and simplifies the transition from a custom antenna coil to a finished or semi-finished assembly.
Whether you need a standalone 125 kHz or 13.56 MHz RFID antenna coil, a coil with electronic components, or a more complete RFID assembly, we can manufacture according to your approved drawings, specifications, and assembly requirements.
Contact us to get a free quote and more expertise about RFID Antenna Coils. Your project will meet a right solution with JHCoils.
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