Coin Antenna

The coin antenna is a compact, cylindrical external RF antenna with a button-like shape. Designed as a 2.4GHz 5.8GHz Dual Band Antenna, it provides a lightweight wireless transmission solution for small electronic devices using WiFi, Bluetooth, and ZigBee communication.

Qianmu Communication's self-developed button rubber rod antenna adopts one-piece injection molding and sealing technology. It integrates a full copper resonant element and a metal reflective shielding layer at the bottom.

Equipped with a standard SMA threaded interface, this SMA Dual Band Antenna can be mounted and secured directly to the device housing. Compared with slender rubber rod antennas and built-in PCB antennas, it offers a compact, discreet structure with a sealed housing for indoor and outdoor applications.

How It Works

The coin antenna uses an internal double-layer ring copper oscillator for dual-band RF transmission and reception. The button-shaped base incorporates a metal reflective layer designed to help manage signal radiation and reduce the influence of nearby electronic components.

1. Layered oscillator design: The upper layer is designed for the 2.4GHz band used by Bluetooth and ZigBee, while the lower layer supports the 5.8GHz band used by compatible WiFi devices. The stated full-band VSWR is ≤1.35.

2. Base shielding and interference management: The bottom metal reflective layer is designed to reduce the influence of electromagnetic interference from the device's main board, lithium battery, and metal housing. Actual performance depends on the installation environment and requires testing in the finished device.

3. Sealed housing and temperature resistance: The one-piece injection-molded housing is designed for environmental protection. The stated operating temperature range is -35°C to +70°C. Temperature-related frequency stability should be confirmed under the specified test conditions.

4. RF impedance matching: The antenna uses a 50Ω nominal impedance to support RF integration and reduce impedance mismatch. Gain, VSWR, and radiation efficiency can be evaluated through appropriate RF testing.

Compatible Equipment and Applications

1. Smart Home: As an Antenna for Smart Home Devices, it can be used in mini smart gateways, WiFi sockets, door and window alarms, and Bluetooth remote controls. Its compact structure helps accommodate wireless connectivity in devices with limited installation space.

2. Industrial Internet of Things: This Wireless Sensor Antenna can be considered for miniature temperature and humidity terminals, warehouse asset-tracking nodes, and wireless data transmission modules. It is also relevant to Antenna for IoT Devices applications where the frequency band and installation conditions match the system requirements.

3. Portable Electronics: As a Compact Antenna for Portable Devices, it can be used in handheld scanning equipment, portable detectors, and mini Bluetooth speakers. Device layout and RF performance should be evaluated before final integration.

4. Security Devices: This Antenna for Wireless Security Devices may be suitable for small wireless cameras and access-control systems. For compatible Bluetooth-based entry systems, it can serve as a Bluetooth Access Control Antenna.

5. RF Accessories: Optional accessories include SMA-to-IPEX feeder cables and other compatible RF connection components. Connector selection should be confirmed against the wireless module and device interface.

Core Product Features

Qianmu Communication provides coin antenna options for compact wireless devices, with specifications and interface configurations selected according to the application requirements.

1. Compact button-shaped structure: Available in 15mm and 18mm base diameters, with a height of 14mm. The small footprint supports installations where external antenna space is limited.

2. Dual-band operation: This Mini WiFi Antenna supports the specified 2.4GHz and 5.8GHz frequency ranges. Depending on the device configuration, the antenna can be used in compatible WiFi, Bluetooth, and ZigBee applications. Confirm protocol-specific frequency requirements before selection.

3. Interface options: Standard configurations include SMA interfaces with different contact arrangements. Compatible accessories may include solder terminals and first-generation or fourth-generation IPEX feeder cables, subject to the selected configuration.

4. Environmental protection: The IP54-rated housing is designed to provide protection against dust ingress and water splashes. Black and white housing options are available according to stock and order requirements.

5. Customization: Custom SMA Antenna options may include dimensional adjustments, shell logo printing, and RF connector configurations. Stock availability, sample lead time, and volume pricing should be confirmed for each order.

Technical Specifications

Application Examples

1. Smart home equipment: A compact antenna can be installed on a WiFi door or window alarm where housing space is limited. The final connection range depends on antenna placement, walls, interference, and the device's RF configuration.

2. Industrial sensor terminals: A Wireless Sensor Antenna may be used with temperature and humidity monitoring equipment. For metal-housed devices, antenna positioning and the surrounding ground structure should be evaluated to determine their effect on RF performance.

3. Outdoor access-control equipment: An externally mounted antenna may support compatible Bluetooth access-control devices. The enclosure, connector seal, and mounting arrangement should be checked against the required environmental conditions.

4. Handheld equipment: This Mini Antenna for Handheld Devices can be considered for wireless barcode scanners and other portable electronics requiring a compact external antenna. Connection stability should be validated in the intended operating environment.

Selection and Ordering Guide

1. Frequency selection: For devices using compatible WiFi and Bluetooth configurations, evaluate the 2.4GHz and 5.8GHz dual-band model. For Bluetooth-only applications, a 2.4GHz single-band configuration may be considered if available.

2. Installation environment: For devices with metal housings, review the antenna's mounting position, clearance, and grounding arrangement. A reflective base does not eliminate the need for RF testing in the final enclosure.

3. Size selection: Consider the 15mm diameter version when mounting space is restricted. The 18mm version may be considered when the available space and required RF characteristics support it; confirm performance rather than assuming that the larger model always provides higher gain.

4. Interface and export requirements: Confirm whether the device requires an SMA inner-pin or inner-hole interface. IPEX adapter cables, connector configurations, and neutral export packaging can be discussed when preparing an order.

FAQ

1. Can this antenna be used with metal-cased devices?

It may be suitable for metal-cased devices, but performance depends on the antenna's mounting position, clearance, ground structure, and housing design. The reflective base is intended to help manage the interaction with nearby structures. Testing in the finished device is recommended.

2. Can the SMA interface be changed to IPEX?

Compatible feeder cables and interface configurations may be available, including specified IPEX generations. Please confirm the required connector type, cable length, and installation arrangement before ordering.

3. Can a laboratory test report be provided?

RF test documentation may be available for applicable product configurations. Confirm the available reports, measured parameters, and test conditions with Qianmu Communication before placing an order.

4. Is this 2.4GHz 5.8GHz Dual Band Antenna suitable for WiFi and Bluetooth devices?

The specified frequency ranges cover 2.4GHz and 5.8GHz operation. Compatibility depends on the device's wireless protocol, required frequency band, connector, and RF design. For ZigBee devices operating at 2.4GHz, confirm the matching configuration and validate performance in the final product.

5. Can the connector or cable configuration be customized?

Custom SMA Antenna configurations may be available for different device interfaces and installation requirements. Provide the connector type, cable length, frequency range, and target application so the required configuration can be evaluated.

6. Can this antenna be used in smart sensors and portable equipment?

It may be suitable for WiFi Antenna for Smart Sensors applications and other compact wireless products when the frequency range and RF characteristics meet the device requirements. For portable equipment, assess the available mounting space, enclosure materials, and antenna position before finalizing the design.