1. Antennas Tim Morgan

2. Overview • Goal • Simulations using ADS • Coplanar Waveguide • Monopole Antenna • Split Ring Resonators • Fabrication & Testing • Future • Travels

3. Goal • GPS application • Antenna Specifications • Multiple frequency (1.575 & 1.227 GHz) • Coplanar Waveguide • Split Ring Resonators • Tunability

4. The Product SRR Monopole Antenna 47 mm Coplanar Waveguide

5. Coplanar Waveguide • Feed mechanism to monopole antenna • Benefit: easy fabrication – one side of substrate • Design • Started with impedance desired for network matching • Substrate thickness • Gaps & Conductor thickness ratios

6. Monopole Antenna • Primary frequency: 1.575 GHz • Design • Frequency: λ/4 • Impedance matching to CPW • Set same width as center conductor

7. Split Ring Resonators • Secondary Frequency: 1.227 GHz • Design: • No standard design equations • Scaled published SRR dimensions by ratio • Simulated to find best placement and orientation

8. Final Simulations

9. Fabrication & Testing • Standard photolithography • FR4 substrate (dielectric of 4.4) 1.6 mm thick • Added 2nd order Hilbert Curve • Preliminary Tests • Both frequencies, but not the desired bandwidth

10. Future • Understand why real result didn’t match simulation • Improve design with feedback from Dr Varadan

11. India

12. Iron Pillar • 1600 years old with little to no rust • protective coating developed in the 5th century to prevent oxidation • 3 layer protection

13. TajMahal

14. Mysore

15. Friends