1. The Fourth International Fab Lab Forum and Symposium on Digital Fabrication Field Fabrication of Advanced Antennas George D. Sergiadis Aristotle University of Thessaloniki, Greece School of Engineering, Dept. of Electrical & Computer Engineering Telecommunications Laboratory

2. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Communications, communications, communications, communications We need all sorts of communications, voice, data…

3. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Rural mesh model - main components Hardware: –Routers –Antennas, cables –Power supplies - Solar –Structural solutions Software: –Networking and dynamic multihop routing –QOS control –Management –Security and privacy

4. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Advanced Antennas

5. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Advanced Antennas at 2 to 5 GHz 1.High Gain 2.High Manufacturing Accuracy 3.Specialized Materials 4.High cost Price: $349.90

6. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Field produced Antennas

7. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Fab Lab Approach Very low material cost, 1 to 3 US $ Low Manufacturing Sensitivity Locally Found Materials Fab Lab easily reproducible, by unskilled “Fablabers”, using the Fab Lab tools

8. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Collinear Antennas, 2.4 GHz, 3 to 9 dbi

9. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Planar Antennas, 8 dipoles, 2.4 GHz, 9 dbi

10. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Wide bandwidth

11. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 High gain

12. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Very high gain systems, 64 dipoles Planar design Paralleling of elementary dipoles Glass dielectric Phased feeding But, Sensitive to Glass thickness and e r

13. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Challenging research issues Glass dielectric constant variability Glass losses Glass width variability Dielectric homogeneity, higher frequencies Manufacturing tolerant design Low cost testing tools

14. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 New approach – Air dielectric – 9 to 13 dbi

15. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 First simulation results

16. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Dual band function, 2.4 and 5 GHz operation

17. George Sergiadis  The Fourth International Fab Lab Forum and Symposium on Digital Fabrication – Chicago, August 22-23 2007 Related publications “A wideband printed dipole antenna with optimized tapered feeding balun for ISM and FWA bands” Microwave and Optical Technology Letters (Wiley), Vol. 43, No. 5, pp. 437-441, December 2004. “ Wideband Printed Dipole Antenna Parasitically Enhanced with Over-an-Octave bandwidth. Dual-band Variant for WLAN Applications ” Microwave and Optical Technology Letters (Wiley), Vol. 48, No.3, pp. 444-449, March 2006.

18. The Fourth International Fab Lab Forum and Symposium on Digital Fabrication Field Fabrication of Advanced Antennas George D. Sergiadis Aristotle University of Thessaloniki, Greece School of Engineering, Dept. of Electrical & Computer Engineering Telecommunications Laboratory