AUGUST 2005SYMPOSIUM ON DIGITAL FABRICATION TROMSO ELECTROMAGNETIC APPLICATIONS LABORATORY OF...

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

ELECTROMAGNETIC APPLICATIONS

LABORATORY OF TELECOMMUNICATION

S

George SergiadisAssociate Professor

sergiadi@auth.gr

ARISTOTLE UNIVERSITY OF THESSALONIKI GREECE

SCHOOL OF ELECTRICAL ENGINEERING DEPARTMENT OF TELECOMMUNICATIONS

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Can we imagine our world without

(Tele)communications ?

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Is access true for everyone?

Country Fixed phones per 100

habitants

Mobile phones per 100

habitants

Uganda 0.28 1.43

Nigeria 0.43 0.28

South Africa

11.35 21.00

India 8 8

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

WiFi 802.11 networks

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Commercial Antennas

Price: $349.90

High Gain Omni Wireless AntennaRadioLabs Low Price:

$169.95

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Fab Lab WiFi Antenna Specifications

• Low cost

• Fabrication faults tolerant

• Bandwidth min 2.4 to 2.5 GHz

• Input Impedance 50 Ohm

• VSWR <2

• Omni directional or directional characteristics

• High, medium or low gain

• Mechanical rigidity

• Weather resistant

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Fab Lab WiFi Antenna Projects

• Planar antennas

• Parabolas

• Glass antennas

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Fab Lab Glass Antennas

• Glass substrate

• Self-adhesive cooper elements

• Longitudinal setup

• CAD construction

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Wide Bandwidth

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Higher gain = Glass Antenna Arrays

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Array directivity

Directional 1200 - Gain 9 dbi

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Antenna “Ingredients”

1. Window Glass2. Self adhesive cooper3. CAD file4. Flexible low-loss cable, or5. Fab Lab transmission lines

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Very high gain systems(under development)

Directivity 600 to 350 - Gain 12 to 15 dbi

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Future Work (under publication)

Introduction of parasitic elements for even wider bandwidth

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Future Work

Extremely wide bandwidth to include new bands

AUGUST 2005 SYMPOSIUM ON DIGITAL FABRICATION TROMSO

Thank you for attention

Come and see !