TX915-JKS-20 is a 915MHz bendable rubber antenna. Height of the antenna is 195mm. 3.0dBi gain and low SWR ≤ 1.5. With a SMA-J connector, it can be applied to such broadband communication system, WLAN and mobile terminal equipment with frequency of 915MHz as router, AP, radio station, WiFi, smart TV and so on.
| Technical Parameter | Specifications |
|---|---|
| Model Number | TX915-JKS-20 |
| Frequency Band | 915 MHz (ISM Band) |
| Antenna Gain | 3.0 dBi |
| Interface Type | SMA-J (SMA Male) |
| Standing Wave Ratio (SWR) | ≤ 1.5 |
| Characteristic Impedance | 50 Ω |
| Physical Weight | 22g ± 1g |
Download Manual
TX915-JKS-20 Manual
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Application
Precision Agriculture RTK Systems
The TX915-JKS-20 provides the reliable 915MHz link budget required for RTK GPS units on irrigation machines. Its 3.0dBi gain ensures that differential correction data is received accurately across expansive fields, solving the signal dropout issues common with lower-quality stock antennas.
Industrial LoRaWAN Gateway Deployment
For LoRa gateways operating in heavy-interference factory environments, this antenna’s low SWR (≤1.5) minimizes reflected power back to the transmitter. This protects expensive RF front-ends and maximizes the effective communication radius for thousands of distributed industrial sensors.
Smart Utility Metering Nodes
In urban environments where signals must penetrate concrete walls, the TX915-JKS-20 leverages its omnidirectional radiation pattern to maintain consistent connectivity for smart water and gas meters, regardless of the device orientation within the utility vault.
FAQ
Q: How does the Voltage Standing Wave Ratio (SWR) of ≤1.5 affect the overall efficiency of an E220 series LoRa module?
A: An SWR of 1.5 or less indicates that over 96% of the power delivered by the RF module reaches the antenna radiation element, with less than 4% reflected. For high-power modules like the E220-900T30D, this low reflection is critical to prevent thermal stress on the power amplifier (PA) and ensure that the full 30dBm output is effectively radiated to achieve the rated 10km range.
Q: What is the impact of the 50-ohm characteristic impedance matching on signal integrity in 915MHz systems?
A: The 50-ohm resistance of the TX915-JKS-20 is matched to the standard output impedance of industrial RF transceivers. Maintaining this impedance continuity through the SMA-J connector prevents signal reflections and phase distortion. In high-speed GFSK or LoRa modulation, this matching is essential to preserve the signal-to-noise ratio (SNR) and minimize packet loss over long-distance links.
Q: Can the TX915-JKS-20 be used in outdoor environments with high vibration, such as on heavy machinery?
A: The antenna is constructed with a bendable rubber sleeve and a reinforced SMA-J interface, providing mechanical resilience against vibration and physical impact. However, for permanent outdoor installations on machinery, engineers should ensure the SMA connection is secured with appropriate torque to prevent loosening, which would introduce parasitic resistance and degrade the 3.0dBi gain performance over time.
