When choosing the best 868MHz antenna for your applications, we need to consider several key factors, like the environment and radiation pattern. Usually the 868MHz antenna can be used in LoRa, Sigfox and some ISM band, especailly in Europe.
In this guide, we will explain some key factors when choosing an 868MHz antenna and help you to choose the best one for your application.
What Is an 868MHz Antenna?
An 868MHz antenna is designed to operate within the 868 MHz Industrial, Scientific, and Medical (ISM) frequency band, which is widely used throughout Europe for LoRaWAN, IoT devices, smart metering, remote monitoring, and wireless sensor networks.
Because radio performance depends heavily on antenna efficiency, choosing the right antenna can greatly improve communication range and network reliability.
Why Is Antenna Selection Important?
Many wireless communication issues are caused by poor antenna selection rather than limitations of the radio module itself.
A properly selected 868MHz antenna can provide:
- Longer communication range
- Better signal penetration
- Reduced packet loss
- Improved network reliability
- Lower power consumption
Even devices using the same LoRa module can show dramatically different performance depending on the antenna used.
Key Factors to Consider When Choosing an 868MHz Antenna
1. Antenna Gain
Antenna gain describes how effectively an antenna focuses radio energy.
Common gain options include:
- 2 dBi: Wide coverage, suitable for short-range applications
- 3 dBi to 5 dBi: Balanced performance for most IoT deployments
- 6 dBi to 8 dBi: Extended range in open environments
Higher gain does not always mean better performance. High-gain antennas often have narrower vertical coverage patterns.
2. Omnidirectional vs Directional Antennas
Omnidirectional Antennas
Omnidirectional antennas transmit and receive signals in all directions.
Advantages:
- 360° coverage
- Easy installation
- Ideal for gateways and base stations
Applications:
- LoRaWAN gateways
- Smart city deployments
- Industrial monitoring
Directional Antennas
Directional antennas focus energy in a specific direction.
Advantages:
- Longer transmission distance
- Better interference rejection
- Improved signal strength
Applications:
- Point-to-point communication
- Remote monitoring systems
- Long-distance IoT links
3. Indoor or Outdoor Installation
Installation environment significantly affects antenna performance.
Indoor Antennas:
- Compact design
- Easy integration
- Suitable for smart buildings and offices
Outdoor Antennas:
- Weatherproof housing
- UV-resistant materials
- Enhanced coverage
For outdoor deployments, look for antennas with an IP67 or higher protection rating.
4. Connector Type
Verify antenna compatibility with your device.
Common connectors include:
- SMA Male
- SMA Female
- RP-SMA
- N-Type
- IPEX / U.FL
Choosing the wrong connector can prevent proper installation.
5. Antenna Size and Mounting Requirements
Available installation space often determines antenna type.
Options include:
- Rubber duck antennas
- Fiberglass antennas
- PCB antennas
- Magnetic mount antennas
- Adhesive antennas
For embedded devices, compact PCB or adhesive antennas may be preferable.
6. Ground Plane Requirements
Certain antenna designs require a proper ground plane to achieve optimal performance.
Before selecting a PCB antenna, review:
- Ground plane size
- PCB layout recommendations
- Installation orientation
Ignoring these factors can reduce efficiency and communication range.
Common Types of 868MHz Antennas
Fiberglass Antennas
Best for:
- LoRaWAN gateways
- Outdoor infrastructure
- Industrial applications
Benefits:
- High gain
- Excellent durability
- Long communication range
Rubber Duck Antennas
Best for:
- Wireless devices
- Gateways
- Portable equipment
Benefits:
- Compact size
- Easy installation
- Cost-effective
Magnetic Mount Antennas
Best for:
- Vehicles
- Temporary installations
- Mobile monitoring systems
Benefits:
- Flexible positioning
- Strong signal performance
PCB Antennas
Best for:
- Embedded IoT devices
- Compact products
Benefits:
- Small footprint
- Low cost
- Easy integration
Which 868MHz Antenna Is Best for Your Application?
| Application | Recommended Antenna |
|---|---|
| LoRaWAN Gateway | Outdoor Fiberglass Antenna |
| Smart Metering | Omnidirectional Antenna |
| Industrial IoT | High-Gain Fiberglass Antenna |
| Smart Agriculture | Outdoor Omnidirectional Antenna |
| Asset Tracking | Compact Rubber Duck Antenna |
| Embedded Device | PCB Antenna |
Frequently Asked Questions
Does a higher gain antenna always provide better performance?
No. Higher gain antennas increase range in specific directions but may reduce coverage in other areas.
How far can an 868MHz antenna transmit?
Transmission distance depends on antenna gain, installation height, environment, and radio power. In LoRa applications, communication distances can range from several kilometers to over 15 km under favorable conditions.
Can I use a 915MHz antenna for 868MHz systems?
It is not recommended. Antennas are optimized for specific frequency bands, and using the wrong frequency can reduce performance and increase signal loss.
What is the best antenna for LoRaWAN gateways?
Outdoor omnidirectional fiberglass antennas with gains between 3 dBi and 8 dBi are commonly used for LoRaWAN gateway deployments.
In Conclusion, when choosing a 868MHz antenna, you have to consider more factors, environment, coverage, antenna gain, form and budget to your IoT or wireless applications. Followings are some common questions when choosing a best 868MHz antenna.
1.) Is it tuned to 868MHz ?
2.) Is the connector type ok for your devices ?
3.) Is the gain appropriate for your distance and coverage ?
4.) Is it omni directional or directional based on your cases ?
5.) Is the installation mounting suitable ?
6.) Is the cable length suitable for low signal loss ?