1. 1 Antenna Design Progress Chi-Chih Chen Research Associate Professor Domenic Belgiovane Graduate Student The Ohio State University ElectroScience Laboratory Electrical and Computer Engineering Department 1330 Kinnear Road, Columbus, OH 43212 TEL: (614) 292-3403, FAX: (614) 292-7297, Chen.118@osu.edu

2. 2 36” 48” 60” Imaginary Real  Antenna gain is proportional to antenna height  To compensate for increased height:  Pitch angle must remain constant ( 83.5°)  Number of turns increases Pitch Angle BW ~60° BW ~56° BW ~65° Top Radius: 0.15” Bottom Radius: 5”

3. 3 Outer Radome Inner Structure Study on the effects of a radome and/or support structure for the antenna Material:  ABS (Acrylonitrile Butadiene Styrene)  Dielectric Constant: 2.60-3.5  Loss Tangent: 0.004 – 0.015 Simulations have chosen the worst case scenarios. Conclusions  ABS as a radome may be too lossy in the worst cases.  Use ABS as inner support structure lay antenna on top.  A thin coating can be applied to keep moisture out. With Material No Material

4. 4  Prototype Antenna Design  Determine method for antenna fabrication for prototype  Possible to conductive paint surface  Copper tape the surface  feeding network connection to the antenna.  Finalize and prototype antenna design  Measure Gain pattern and Impedance  Reconfigure feed network impedance accordingly  Prototype Deploying Structure  Investigate further materials for radome/structure  Finalize design concept  Prototype deploying mechanism

5. 5 Extra Slides

6. 6 36” 48” 60” 3 dB Beamwidth