1. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 DS4T4 Differential Dual Polarized Antenna Array Design - Eloy de Lera Acedo - Research Associate at Cavendish Laboratory, University of Cambridge

2. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Index Work at ASTRON – FLOWPAD 3 –(Feb – May 2007) Work at FG-IGN/UC3M – FIDA 3 –(Jan 2006 – Sep 2007)

3. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Index Work at ASTRON – FLOWPAD 3 –(Feb – May 2007) Work at FG-IGN/UC3M – FIDA 3 –(Jan 2006 – Sep 2007)

4. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FLOWPAD 3 Ultra Wide Band Array Work at ASTRON –FLOWPAD 3 (Foilbased LOW cost PAcman Differential Dual polarized Demonstrator) is an active phased array tile of differentially fed tapered slot antenna elements which demonstrates the integration of the results of separated work packages of PACMAN (Phased Array Communication Antennas for Mass- Market Application Needs) and SKADS DS4T4. –The demonstrator will not cover the full requirement specification of SKA antenna, but it will indicate what is achievable in future. –Low Cost is the main target. –Working band: 0.3-1 GHz.

5. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FLOWPAD 3 Antenna Model - Diff. technology - Bigger elements - Low cost materials - No Ground plane - + 00 ODD MODE

6. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FLOWPAD 3 Ultra Wide Band Array FLOWPAD 3 Differentially fed antennas (bridge in DLNA board ) Reduce costs: –Number of LNA’s per square meter. »Down to 73.5. –Low cost Materials, no ground plane.

7. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Future Work Connection between strokes of antennas Build and measure final tile

8. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Index Work at ASTRON – FLOWPAD 3 –(Feb – May 2007) Work at FG-IGN/UC3M – FIDA 3 –(Jan 2006 – Sep 2007)

9. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FIDA 3 FG-IGN Differential Active Antenna Array Centro Astronómico de Yebes (CAY) Fundación General de la Universidad de Alcalá – Instituto Geográfico Nacional (FG-IGN) Departamento de Teoría de la Señal y Comunicaciones – Universidad Carlos III de Madrid (TSC-UC3M)

10. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Work at FG-IGN/UC3M Wide Band and Ultra Wide Band Antennas Use of Genetic Algorithms for structure optimization

11. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Work at FG-IGN/UC3M Wide Band and Ultra Wide Band Antennas

12. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 After optimization: transmission coefficient above -0.45 dB from 0.1 to 1 GHz Work at FG-IGN/UC3M Feeding Systems

13. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Edge Effect Work at FG-IGN/UC3M Arrays

14. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FIDA 3 Ultra Wide Band Array Array FIDA 3 : FG-IGN Differential Active Antenna Array –FIDA 3 is an active tile of differentially fed antennas to demonstrate the capabilities of differential technology, easiness of fabrication and reduced costs through the use of big elements. –Working band: 0.3-1 GHz.

15. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FIDA 3 Ultra Wide Band Array FIDA 3 : –Differentially fed antennas – Bunny Ears –No extra substrate, no ground plane. –Aluminum elements are being considered –Big elements. Reduced number of LNAs/m 2

16. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FIDA 3 Discrete DA Real Circuit (ATF 34143):

17. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 FIDA 3 Discrete DA Balanced DA

18. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Future Work Optimize antenna performance Measure LNAs Feeding network Build and measure final tile

19. Eloy de Lera Acedo 2 nd SKADS Workshop 10-11 October 2007 Thanks for your attention