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

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