The Ebyte TX868-JKD-20 is a high-performance 868MHz vertical rubber rod antenna featuring a 3.0dBi gain, SWR <= 1.5, 50-ohm impedance, and a standard SMA-J male connector for EU 868MHz LoRa, Sigfox, and IoT applications.
| Technical Parameter | TX868-JKD-20 Specification | Remarks / Conditions |
|---|---|---|
| Operating Frequency | 868 MHz | Designed for EU868 ISM Band |
| Antenna Gain | 3.0 dBi | Vertical polarization high gain |
| Voltage Standing Wave Ratio (SWR) | <= 1.5 | High RF power transfer efficiency |
| Nominal Impedance | 50 Ohm | Standard RF system matching |
| Connector Interface | SMA-J (SMA Male, internal pin) | Threaded RF interface |
| Product Weight | 20 g | Lightweight rubber rod design |
| Polarization Type | Vertical Polarization | Omnidirectional horizontal coverage |
Practical Application Scenarios
1. European Smart Grid Remote Metering Gateways
In smart energy metering systems across Europe operating on the EU868 ISM band, reliable RF signal propagation is critical for concentrators. The TX868-JKD-20 antenna provides a stable 3.0dBi gain and an SWR of <=1.5 to maximize RF power output without reflections. Connected directly to Ebyte 868MHz Wireless Modems or DTU gateway enclosures via its SMA-J interface, it ensures uninterrupted long-range telemetry between smart electricity meters and central data collectors.
2. Industrial Sub-GHz Wireless Sensor Networks in Manufacturing
Factory automation requires dependable RF connectivity for temperature, vibration, and environmental sensors across noisy industrial floors. The TX868-JKD-20 utilizes vertical polarization and 50-ohm impedance matching to minimize signal fading caused by metallic obstructions. Paired with Ebyte 868MHz LoRaWAN end-node modules, this antenna extends line-of-sight communication distances while maintaining a compact, durable 20g rubberized footprint suitable for vibrating equipment cabinets.
3. Agricultural Soil & Environmental Monitoring Nodes
Outdoor agricultural IoT stations deployed in fields require compact, weather-resistant antennas that do not overload lightweight enclosures. The 20g lightweight TX868-JKD-20 rubber rod antenna mounts securely onto field node boxes hosting Ebyte 868MHz Transceiver Modules. Its omnidirectional radiation pattern ensures full 360-degree coverage, allowing weather stations and moisture sensors to transmit environmental metrics across farms to central monitoring gateways over extended ranges.
FAQ Section
1. What type of connector is SMA-J, and is it compatible with standard SMA female ports?
Yes, SMA-J refers to a standard SMA Male connector featuring internal threads and a center pin. It is fully compatible with standard SMA Female ports (SMA-K, which feature external threads and a center hole) commonly found on Ebyte wireless modules, gateways, and RF testing equipment. It is not compatible with RP-SMA (Reverse Polarity SMA) interfaces without an adapter.
2. Why is an SWR rating of <=1.5 important for 868MHz transceiver modules?
Standing Wave Ratio (SWR) measures how efficiently radio frequency power is transmitted from the wireless module through the antenna. An SWR of <=1.5 indicates that less than 4% of the RF power is reflected back into the transmitter. This low reflection minimizes thermal buildup in the power amplifier of Ebyte 868MHz transceivers, maximizing battery efficiency and transmission range.
3. Can this 868MHz antenna be used for 915MHz LoRa application bands in North America?
While the antenna may physically thread onto a 915MHz device, it is specifically tuned for optimum resonance at the 868MHz frequency band. Using an 868MHz tuned antenna on a 915MHz carrier frequency will result in higher SWR, increased insertion loss, and reduced transmission range. For 915MHz US/Australia deployments, an antenna centered at 915MHz should be selected.
