Simulation of Multi-Band Vehicle Antenna for V2X and GNSS

Project Description

We are seeking a freelancer to remotely design and simulate a low-profile, vehicle-mountable antenna system supporting DSRC / C-V2X (5.9 GHz), GNSS (L1/L2), and optionally 4G LTE fallback.

The antenna will be simulated as being mounted on a car roof (metallic ground plane). A rugged, puck-style or shark-fin style geometry is preferred, and the project is entirely simulation-based — no hardware build is required.

Objectives:

• Design a multi-band antenna operating at:
  • GNSS: 1.575 GHz and 1.227 GHz (L1/L2)
  • V2X: 5.85–5.925 GHz
  • Optional LTE fallback: 700 MHz – 2.7 GHz
•  Optimize for:
  • Return loss < –10 dB in each band
  • Isolation > 15 dB between ports
  • Efficiency > 60% for each band
  • Good gain (>0 dBi GNSS, >3 dBi V2X)
•  Simulate performance on:
  • Standard car roof (approx. 1 m² metal ground plane)
  • Curved dielectric radome enclosure (optional)

Deliverables:

• Full 3D EM simulation model (HFSS, CST, or equivalent)
• S-parameters, VSWR, and radiation pattern plots
• Efficiency and gain vs frequency plots for each band
• Document (5–7 pages) with:
  • Geometry and design rationale
  • Mounting considerations
  • Frequency-wise performance discussion
  • Isolation and interference management strategy
• Optional:
  • Mockup of enclosure with radome (STEP or STL format)
  • DXF or Gerber layout of PCB trace if PCB-based design is chosen

Recommended Tools:

• CST Microwave Studio
• Ansys HFSS
• Altair FEKO
• Optional: CAD tool (Fusion360, SolidWorks, etc. for enclosure design)

Ideal Freelancer Profile:

• Experience with automotive antennas, GNSS, and multi-band systems
• Understanding of ground plane interactions and radome effects
• Experience optimizing designs for mass production or outdoor use
• Strong simulation and documentation skills

Timeline: 2.5 – 3.5 weeks total

How to Apply:

Please include:

• Antenna simulation software you will use
• Previous experience with vehicle or multi-band antennas (images or reports)
• Your proposed timeline and budget
• Optional suggestions for antenna housing type (shark-fin, puck, etc.)