Design and Simulation of a Tri-Band Antenna for Industrial IoT Gateways

Project Description

We are looking for a skilled RF/Antenna Design freelancer to remotely develop and simulate a tri-band antenna for use in industrial IoT gateway devices. The antenna should operate efficiently in the following bands:

• 868 MHz (LoRa/ISM)
• 2.4 GHz (Wi-Fi, BLE, Zigbee)
• 5.8 GHz (Wi-Fi, high-speed backhaul)

The final product should be optimized for PCB integration, enclosed in an ABS or polycarbonate casing, and designed to minimize interference and detuning from nearby components like batteries and metal shielding.

This is a simulation-only project — no physical prototyping or hardware fabrication required.

Objectives:

• Design a compact PCB-integrated antenna, supporting the three mentioned bands.
• Simulate interaction with plastic housing and nearby ground plane.
• Ensure good matching:
  • S11 < –10 dB at each frequency band
  • Efficiency >65% preferred
• Provide tuning options for mass production.
• Account for component placement effects on radiation and detuning.

Deliverables:

• Full 3D simulation files (CST, HFSS, or equivalent)
• Exported plots:
  • S11 vs Frequency (868 MHz, 2.4 GHz, 5.8 GHz)
  • VSWR and bandwidth per band
  • 2D and 3D radiation patterns
  • Efficiency vs Frequency
• Geometry drawing with labeled dimensions
• Enclosure model + simulation setup
• Short tuning guideline report (1–2 pages)
• Optional: PCB layout section in DXF/Gerber format

Preferred Tools

• CST Microwave Studio
• HFSS
• FEKO
• Altair or EMPro

Ideal Freelancer:

Demonstrated experience in compact antenna design
Prior tri-band or multi-band project experience
Understanding of housing integration and detuning
Strong communication and documentation skills
Able to deliver professionally packaged simulation results

Timeline: Duration: 3–4 weeks