presentation thursday wireless_networks
TRANSCRIPT
Welcome
Sensor Platform DesignAntenna Design & Energy Harvesting
Mayur SarodeEngineer , INCAS3
About me
Sensor Platform Design
Wireless Autonomous Sensor Platform (WASP)
ULP (μW) consumption
Wisemote/Cargate as a WASP design
RadioSignal
Processor Sensor
Energy Storage
Energy Harvester
antenna
Antenna Design; Introduction
Any conducting object is an antenna
Small antenna for sensor applications : length< λ/10 Short dipole antenna loop antennas microstrip patch antennas
Various shapes & sizes
Performance parametersDirectivityGainRadiation PatternPolarizationInput impedanceResonance frequencyEfficiency
Antenna Design; Desing Flow
EM: Electromagnetic Simulation
Antennas Design; Wisemote™ 2.0 rev.2
Specifications Efficient than present chip antenna in the Wisemote Ideally Omnidirectional Maximum range Integrated on the Wisemote
Theoretical analysis An electrically small antenna (ka<0.5) Spherical helix antennas chosen Selection of EM simulation software
Mathematical Model
Importing as a Fortran
code
Antenna analysis with NEC2
Antenna Design; Simulation Results
Radiation Pattern
Polarization
2dB<Gain<5.24 dB@ 45°-90°
Linear Horizontal Polarization
Reflection results
Input impedance
Higher Antenna efficeincy
S11= -17 dB22.5 GHz VSWR°1.35:1
Z=39.96+ 9.14jΩ
No external impedance matching required
Antenna Design; Manufacturing
Manufacturing the antenna
Conformal printing of metallic ink
Antenna feed design
Impedance matching
Radio
Feed pointmatching
Design of microstrip lines/balun for antenna testing
Created by Georges Meinders in Catia
Simulated in CST at IMEC/Holst center
Antenna Design; RF Measurements Wisemote™ 2.0 rev.2
Polarization measurement with antenna orientation
E
Base
sta
tion
H
EH
RX_V
RX_H
Antenna on Wisemotes is horizontally polarized
Antenna Design : Conclusion
Impedance matching of the antenna
Antenna Diversity Using orthogonal antennas at basestation
Energy Harvesting; Wireless Cargate
Solar cells
Power management
Energy storage, capactior, battery
Magneto sensor Radio
Proposed block diagram
Power Management DesignOptimum load @light intensity
Thank you for listening