2. Helix Antenna Helix Antenna Array Design and Measurements By Ivette Betancourt

3. Helix Antenna Story Dr. John Kraus Professor of Electrical Engineering and Astronomy Emeritus Ohio State University Source:http://www.cqbooks.com/default.htm

5. Radiation Patterns NORMAL MODE

6. Radiation Patterns AXIAL MODE

7. Geometrical Considerations S D1 L D2 Matching Network

8. Building the First Prototype

9. Building the Array

10. Increasing the Diameter Matching Network Kapton Tape D1 D2

11. Calculations Source:http://www.csgnetwork.com/antennahtcalc.html

12. Measurements

13. Return Loss

14. VSWR

15. The End

16. Resonance and Matching Reflection SWR Return Loss Smith Chart Impedance Transmission

17. Gain Spectrum AnalyzerSignal Generator