Design & Simulation of a Circularly Polarized Antenna for CubeSat Communication

Project Description

We are seeking a skilled RF or antenna design freelancer to remotely develop a circularly polarized (CP) antenna for a CubeSat UHF/VHF or S-band telemetry and command application. The goal is to design a compact, high-efficiency antenna suitable for space-constrained satellite platforms, capable of maintaining good axial ratio and radiation characteristics in a CubeSat structure.

This is a simulation-only project — no hardware delivery or physical testing required. Deliverables will be used for internal validation and prototyping.

Objectives

• Design a compact CP antenna operating in either:
  • UHF band: ~430 MHz
  • S-band: 2.4–2.5 GHz (for downlink/uplink)
• Optimize for:
  • Axial Ratio: ≤3 dB in main lobe direction
  • Return Loss: ≤ –10 dB at center frequency
  • Radiation Pattern: Hemispherical or directional
  • Gain: ≥2 dBi (UHF) or ≥4 dBi (S-band)
• Minimize size while respecting CubeSat frame (e.g., 1U/3U)
• Simulate influence of satellite structure (metal casing or panels)

Deliverables

• 3D Antenna model (CST, HFSS, or FEKO file)
• Return Loss (S11) over frequency
• Radiation pattern plots (2D/3D)
• Axial ratio vs frequency and angle
• Efficiency and gain plots
• Short technical report (3–5 pages) with:
  • Design explanation
  • Performance summary
  • Parametric sweeps or optimization approach
•  Optional: Space-saving PCB layout or mounting suggestion

Suggested Tools (Freelancer’s Choice):

• CST Microwave Studio
• Ansys HFSS
• Altair FEKO
• AWR or other EM tools with full-wave 3D capabilities

Ideal Freelancer Background:

• Experience with CubeSat or aerospace antenna design
• Knowledge of CP antenna types (patch, helix, cross-dipole, etc.)
• Skilled in simulating antenna interaction with enclosures
• Can deliver neat documentation and clear plots
• Familiar with UHF/S-band satellite communications

Total duration: 2–3 weeks

How to Apply:

• Your preferred simulation tool
• Example(s) of past antenna work (especially CP or aerospace-related)
• Estimated delivery time and budget
• Recommendation on frequency band if both are feasible