Simulation and Optimization of a 915 MHz Rectenna for RF Energy Harvesting
Project Description
We are seeking a freelance RF engineer to design and simulate a compact rectenna (antenna + rectifier) that can efficiently capture RF energy at 915 MHz ISM band and convert it into usable DC voltage for low-power IoT devices.
This project is entirely simulation-based and intended for feasibility study and future prototyping. The design must prioritize efficiency, compact footprint, and low input power sensitivity.
Objectives:
- Design a rectifying antenna (rectenna) that works in the 902–928 MHz band
- Optimize for:
- Input power: –10 dBm to +10 dBm
- DC output voltage: ≥ 1.5 V at +0 dBm input
- RF-to-DC conversion efficiency > 50% (target >70% at +0 dBm)
- Antenna size ≤ 50×50 mm
- Use a realistic model of a Schottky diode-based rectifier (e.g., HSMS-285x or SMS7630)
- Match antenna impedance to rectifier circuit
- Include simulation of real-world environment (e.g., wall reflections or partial obstruction)
Deliverables:
- EM and circuit co-simulation files (e.g., CST + ADS or HFSS + Keysight ADS)
- Radiation pattern and S11 over the ISM band
- RF-to-DC efficiency curve vs input power
- Output voltage vs frequency
- Rectifier schematic and matching network topology
- Report (5–7 pages) covering:
- Antenna and circuit design
- Impedance matching
- Efficiency metrics
- Environmental considerations and tuning tips
Suggested Tools:
- CST Microwave Studio + Keysight ADS
- Ansys HFSS + ADS or SPICE
- Altair FEKO with circuit co-simulation
Ideal Freelancer Background:
- Experience in RF circuit and antenna co-design
- Familiar with low-power energy harvesting or passive RFID
- Prior work with Schottky diode rectifier circuits
- Ability to deliver clear simulation and documentation
Timeline: Total duration: 2–3 weeks
How to Apply:
Please include:
- Simulation tools you will use
- Screenshot/sample from a similar project (if possible)
- Suggested diode and rectifier topology
- Estimated delivery time and rate