Antennas for Hybrid LPWAN and Cellular Devices: Design Challenges and Solutions

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Introduction


Hybrid LPWAN/cellular devices are becoming the foundation of current IoT installations. Long-range, low-power networks (LPWAN) such as LoRa, Sigfox, and NB-IoT are combined with cellular technologies such as LTE-M, LTE Cat-1, or 4G LTE to provide enhanced coverage, dependability, and redundancy.

At the heart of this hybrid architecture is one of the most difficult RF design elements: the antenna system. Choosing the correct antenna—or antenna combination—is crucial for achieving performance, power efficiency, and regulatory compliance.

Why Hybrid LPWAN and Cellular Architectures Are Used

Hybrid connection balances coverage, cost, and battery usage.

LPWAN for:

  • Ultra-low power operation.
  • Long battery life.
  • Remote and rural coverage

Cellular for:

  • Higher data rates.
  • Mobility support
  • Network backup and dependability
The dual-network technique necessitates sophisticated antenna needs.

Frequency bands in hybrid devices.

Hybrid devices frequently have to accommodate numerous, widely separated frequency bands.

LPWAN Bands

  • LoRa/ISM: 433 MHz, 868 MHz (EU), and 915 MHz (US).
  • Sigfox operates on sub-GHz ISM channels.
  • NB-IoT: Licensed cellular bands (typically under 1 GHz).

Cellular Bands

  • LTE-M/Cat-M1: 700-2200 MHz.
  • LTE Cat-1 / 4G LTE: 700–2700 MHz
  • 5G (certain gateways): sub-6 GHz.

Key Antenna Design Challenges:

1. Wide frequency separation.

Sub-GHz LPWAN and multi-GHz cellular bands produce:

  • Single antenna tuning is challenging.
  • Compromise designs are inefficient

2. Antenna Isolation

Poor isolation can lead to:

  • Desensitization
  • Reduced throughput
  • Certification failure.
  • Target isolation:
  • ≥15 decibels (minimum).
  • ≥25-30 decibels (recommended).

3. Compact Device Size

Small enclosures limit:

  • Antenna efficiency
  • Ground plane size
  • Radiation Pattern Stability

4. Power Efficiency.

LPWAN relies on extremely low transmit power—antenna inefficiency directly reduces battery life.

Antenna Architecture Options:

1. Dual Antenna Architecture (recommended)

Separate antennas for LPWAN and cellular.

Advantages: 

  • Optimal tuning per band 
  • Improved isolation 
  • Increased efficiency

Use Cases

  • Industrial Gateways
  • Smart City Infrastructure
  • Asset tracking devices

2. Multi-band Antenna (single antenna)

One antenna covers the LPWAN and cellphone frequencies.

Advantages

  • Compact design 
  • Low BOM cost

Limitations: 

❌ Reduced efficiency. Narrow tuning margins.

3. External and Internal Antenna Combination

  • External antenna for LPWAN (range crucial)
  • Internal antenna for cellular.
  • Ideal for battery-powered outdoor gadgets.

Best Antennas for Hybrid Devices

LPWAN antennas

  • Quarter-wave whip antennas.
  • Tuned PCB monopoles

Cellular antennas

Antenna Placement and Layout Guidelines

  • Maximise physical separation.
  • Orthogonal orientation (90 degrees)
  • Use grounded shielding between the antennae.
  • Avoid overlapping ground return pathways.
Maintain antennas away from:

  • Displays
  • Batteries
  • Metallic enclosures

Connector and Cable Considerations

  • SMA/RP-SMA for external antennas
  • Low-loss coax for biological pathways
  • PTFE cables for outdoor and high-temperature applications

Regulatory and Certification Considerations

Hybrid devices must adhere to:

  • FCC / CE / RED
  • EIRP restrictions by band
  • SAR/MPE exposure limits

Improper antenna selection can lead to

❌ Invalidate module certification.

❌ Delays time-to-market.

Applications of Hybrid LPWAN and Cellular Antennas


Smart Metering

  • LPWAN for regular data.
  • Cellular for notifications and firmware upgrades.

Asset Tracking

  • LPWAN for low-power tracking.
  • Cellular for mobile and roaming.

Smart Cities

  • Street lighting
  • Environmental monitoring
  • Parking sensors

Industrial IoT

  • Remote monitoring
  • Redundant connection.
  • Harsh environments

Common Design Mistakes To Avoid

❌Using a single antenna for all bands without tweaking. Ignore antenna isolation. 
❌ Poor ground plane design. Choosing antennas without enclosure testing. 
❌ Assuming module approval includes antenna modifications.

Conclusion

Antennas are the most important RF component in hybrid LPWAN and cellular devices. Achieving consistent performance necessitates rigorous band separation, antenna selection, isolation control, and field testing.

A well constructed hybrid antenna system ensures:

✔ Extended battery life

✔ Reliable connection.

✔ Faster certification.

✔ Lower field fails.

Looking for Hybrid LPWAN and Cellular Antenna Solutions?

Eteily Technologies provides custom-designed LPWAN, LTE-M, NB-IoT, and multi-band antenna systems, as well as matching RF cables and connectors to ensure optimal system performance.

Contact Us

Eteily Technologies India Pvt. Ltd.

📫 Address: B28 Vidhya Nagar, Near SBI Bank,
 📍  District: Bhopal, PIN: 462026, Madhya Pradesh
🌐 Website: https://eteily.com

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