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Transcript of NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC 1 Broadband Arrays and Switching...
![Page 1: NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC 1 Broadband Arrays and Switching Antennas Dan Palecek, SD School of Mines and Technology,](https://reader035.fdocuments.net/reader035/viewer/2022062517/56649ee55503460f94bf3f1f/html5/thumbnails/1.jpg)
1NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
Broadband Arrays and Switching Antennas
Dan Palecek, SD School of Mines and Technology, Rapid City, SD
Dr. Anthony Martin, Clemson University, Clemson, SC
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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Overview Background
Simulation SoftwareGenetic Algorithms5:1 Antenna System
Objectives and Strategies / ResultsBroadband ArraySwitching Antenna
Conclusions and Further Research
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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Software Solves electric field integral equation
via method of momentsTraditional triangle basis functionsPulse test functions
Approximates geometry with straight wire segments
Utilizes genetic algorithm (GA) optimization
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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How Do GAs Work? Encode Parameters
Generate Initial Population
Evaluate and Assign Fitness Values
Select Parents Based on Fitness
Reproduce Through Recombination
Mutation
Chromosome
p1
{ { {p2 p3 p4
[ 0101 0011 1101 0101 ]{
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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5:1 Antenna System
L = 0.22 HR = 470
a = 0.4 mm
2a
L R
hL = 11.6 cm
h = 21.25 cm
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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5:1 Antenna System
Matching Network
Lm ZA
Transmission Line
Z0 = 50
1 : 4
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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5:1 Antenna System Bandwidth criteria
VSWR < 3.5 System gain > -4.0 dBi
2
1010log 1 90 dBisys eff AG M G
max
min
Bandwidthff
Cost Function - VSWR and Gain Penalty
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5:1 Antenna System
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5:1 Antenna System
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Broadband Array
ObjectiveDetermine if array retains broadband
characteristics
StrategyPlace 5:1 elements in array configurationVary spacing between elements and observe
effects
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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Broadband Arrayh = 21.25 cm
hL = 11.6 cmd
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Broadband Array
Matching NetworkTransmission
Line
Z0 = 50
1 : 2
Lm
ZA
ZA
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Broadband Array
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Broadband Array
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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Broadband Array200 MHz
300 MHz
400 MHz
500 MHz
600 MHz
700 MHz
800 MHz
900 MHz
1000 MHz
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Switched Antenna
ObjectiveExtend bandwidth of 5:1 antenna via
switching
StrategySwitch in various loaded wire segmentsOptimize for lower frequency bandOpen switch, examine effects on 5:1 band
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Switching Antenna
Switch Open for 5:1 Band
Loaded Segment
5:1 Antenna
Switch
Switch Closed for New Band
Loaded Segment
5:1 Antenna
Switch
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Switching Antenna
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Switching Antenna
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Conclusions
Broadband ArrayBroadband performance can be
maintained
Switching AntennaBandwidth can be increased
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NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC
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Further Research
Broadband Array Feedline between matching network and array
elements Matching network
Switching Antenna Switching mechanism Software modifications