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1 Antenna Design Progress Chi-Chih Chen Research Associate Professor Domenic Belgiovane Graduate Student The Ohio State University ElectroScience Laboratory.

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Presentation on theme: "1 Antenna Design Progress Chi-Chih Chen Research Associate Professor Domenic Belgiovane Graduate Student The Ohio State University ElectroScience Laboratory."— Presentation transcript:

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 TEL: (614) , FAX: (614) ,

2 2  Antenna Design  Current antenna is 36 inches tall  10 dB gain across 500 MHz to 2 GHz bandwidth  Impedance between Ω, but should be uniform across frequency bandwidth.  Antenna Feeding Network  Current design offers good performance across the frequency bandwidth.  Short board allows for cheap fabrication.  Impedance transforming transmission line (50Ω to 170Ω) Fabrication and testing to be completed.  Deploying Mechanism  Some possible design have been presented.  No current final design has been determined.  Antenna Structure  ABS material for use of Radome  Deformation should have little affect on gain pattern.  Large amount of stress at conical base may need additional consideration when mounting to deployment base.

3 3  Move towards Prototyping Structure and Deployment Design  Determine suitable material for antenna structure.  Study Viable options for mechanical deployment  Fly on airplane to as preliminary test  Design Antenna Feeding Network  Impedance transforming transmission line  50 Ω to 170 Ω tapered line  Balanced line output to feed antenna  Fabrication and Testing of Antenna  Fabrication of feed network  Antenna gain pattern measurements Feeding Network Conical Spiral Antenna

4 4 1.93” 193mil 40mil 10” 3.3” Port Ω Port 2 50 Ω Top View Bottom View 0.2” Microstrip tapered line to balanced parallel strip Shorter PCB will allow for cheap in-house fabrication Provides good S11 and S21 across the frequency band Microstrip tapered line to balanced parallel strip Shorter PCB will allow for cheap in-house fabrication Provides good S11 and S21 across the frequency band Rogers, RT/Duroid 5880 ε r = 2.20h =.062 in tan δ = t = 17μm

5 5  Yield stress of ABS:10 MPa (very minimum possible value)  Predicted stress due to air resistance will not cause the ABS to fail  Magnitude of pressure applied to front surface area: 4.6 kPa  Stress is distributed evenly across the face  Yield stress of ABS:10 MPa (very minimum possible value)  Predicted stress due to air resistance will not cause the ABS to fail  Magnitude of pressure applied to front surface area: 4.6 kPa  Stress is distributed evenly across the face Direction of air flow MPa 4 mm thick Conical Radome

6 6 mm Direction of air flow

7 7 Antenna Air Cylinder Deployed Position Non-Deployed Position Transition Considerations for Antenna deployment  Pivoting Mechanism  Deployment follows air drag  Low Profile  Close to fuselage surface  Total footprint approximately antenna diameter.  Electronic Motor controlled  Double acting air-cylinder  Scissoring arm extension  Crank window opener  Weather and Temperature resilient Air Cylinder Concept Scissoring Arm Crank Window Hinge Direction of air flow

8 8  Antenna Design  Determine method for antenna fabrication.  Study affects of ABS Radome on antenna gain pattern.  Simulate effects of connecting the feeding network to the antenna.  Finalize and prototype antenna design.  Measure Gain pattern and Impedance  Reconfigure feed network impedance accordingly  Deploying Structure  Obtain ABS radome structure.  Finalize and build deploying mechanism.  Determine placement on fuselage.  Mount and test deployment on aircraft  Finalize the Design  Combine Antenna and Mechanical designs


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