Aircraft Determine whether to use HFSS or FEKO Compare FEKO and HFSS antenna models Create simplified simulation models of antenna on aircraft Build up to Full Antenna on free aircraft model Acquire more accurate 3D model of chose aircraft ID: 636847
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Slide1
Tasks
Simulation of
Antenna Placement on
Aircraft
Determine whether to use HFSS or FEKO
Compare FEKO and HFSS antenna models
Create simplified simulation models of antenna on aircraft
Build up to Full Antenna on free aircraft model
Acquire more accurate 3D model of chose aircraft
Twin Otter or
Bassler
Simplify geometry for more efficient simulations
Determine optimal location for antenna placement
Design Feeding and Deployment
Mechanisms
Design/Acquire Telescopic deployment mechanism
Choose weather and temperature resistant material
Electric motor and other methods
Match antenna impedance to RF input of receiver
Antenna monitoring systems
Thermistor
Camera
Effects of Wind Resistance
Determine effects of wind for speed ranges of 120-115 knots
Possible faster speeds as well
Choose
most resilient materials for antenna and telescopic structure
Simulation of the antenna and structures in full. Slide2
Antenna Simulation: FEKO vs. HFSS
FEKO
HFSS
Base
Dia
= 7.2 in
Height = 36 in
30 TurnsGND Dia = 12 in
Base Dia = 7.2 inHeight = 36 in30 TurnsGND Dia = 12 in
Frequency: 0.5 - 2.0 GHz @ 0.1 GHz Steps
Realized Gain
3dB BW ~64°
Realized GainSlide3
FEKO
HFSS
Frequency: 2 GHz
Near-Field PlotsSlide4
FEKO
HFSS
Frequency: 0.5 GHz
Near-Field PlotsSlide5
Input Impedance
FEKO
HFSS
Imaginary
RealSlide6
Antenna Placement Determination
Free Aircraft Model
Antenna
Underside
Fuselage
Simulate Antenna on Aircraft Fuselage
Utilized
free
model to obtain approximate
resultsDetermine whether HFSS or FEKO is more useful (FEKO model is not yet resolved) Simulation timeMemory
AccuracySlide7
Preliminary Fuselage SimulationSlide8
Deployment and Feeding
Example of pneumatic telescoping cylinder
Low Cross-section telescoping structure
Also consider a fixed-length pivot/tilting mechanism
Depending on chosen aircraft
Minimum Collapse Depth
Number of stages
Material to be used
Cold resilience
Wind resistive
Deploying Motor
Will consider manual deployment
Additional antenna support structures
Maintain Antenna wire spacing
Prevent mechanical resonance
Mount to aircraft fuselage
Match 50 Ohm input to 300 Ohm Antenna Impedance
Expanding Antenna