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Broadband Arrays and Switching Antennas

Broadband Arrays and Switching Antennas. Dan Palecek , SD School of Mines and Technology, Rapid City, SD Dr. Anthony Martin , Clemson University, Clemson, SC. Overview. Background Simulation Software Genetic Algorithms 5:1 Antenna System Objectives and Strategies / Results

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Broadband Arrays and Switching Antennas

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  1. Broadband Arrays and Switching Antennas Dan Palecek, SD School of Mines and Technology, Rapid City, SD Dr. Anthony Martin, Clemson University, Clemson, SC

  2. Overview • Background • Simulation Software • Genetic Algorithms • 5:1 Antenna System • Objectives and Strategies / Results • Broadband Array • Switching Antenna • Conclusions and Further Research NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  3. Software • Solves electric field integral equation via method of moments • Traditional triangle basis functions • Pulse test functions • Approximates geometry with straight wire segments • Utilizes genetic algorithm (GA) optimization NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  4. How Do GAs Work? Encode Parameters Chromosome [ 0101 0011 1101 0101 ] { { { { Generate Initial Population p1 p2 p3 p4 Evaluate and Assign Fitness Values Mutation Select Parents Based on Fitness Reproduce Through Recombination NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  5. 5:1 Antenna System h = 21.25 cm L R 2a hL = 11.6 cm L = 0.22 mH a = 0.4 mm R = 470 W NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  6. 5:1 Antenna System Matching Network TransmissionLine 1 : 4 Z0 = 50 W Lm ZA G NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  7. 5:1 Antenna System • Bandwidth criteria • VSWR < 3.5 • System gain > -4.0 dBi • Cost Function - VSWR and Gain Penalty NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  8. 5:1 Antenna System NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  9. 5:1 Antenna System NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  10. Broadband Array • Objective • Determine if array retains broadband characteristics • Strategy • Place 5:1 elements in array configuration • Vary spacing between elements and observe effects NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  11. Broadband Array h = 21.25 cm hL = 11.6 cm d NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  12. Broadband Array Matching Network TransmissionLine ZA 1 : 2 Z0 = 50 W Lm ZA G NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  13. Broadband Array NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  14. Broadband Array NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  15. Broadband Array 200 MHz 300 MHz 400 MHz 500 MHz 600 MHz 700 MHz 800 MHz 900 MHz 1000 MHz NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  16. Switched Antenna • Objective • Extend bandwidth of 5:1 antenna via switching • Strategy • Switch in various loaded wire segments • Optimize for lower frequency band • Open switch, examine effects on 5:1 band NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  17. Loaded Segment LoadedSegment Switch Switch 5:1 Antenna 5:1 Antenna Switch Open for 5:1 Band Switch Closed for New Band Switching Antenna NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  18. Switching Antenna NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  19. Switching Antenna NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  20. Conclusions • Broadband Array • Broadband performance can be maintained • Switching Antenna • Bandwidth can be increased NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

  21. Further Research • Broadband Array • Feedline between matching network and array elements • Matching network • Switching Antenna • Switching mechanism • Software modifications NSF SURE Program, Summer 2002 / Clemson University, Clemson, SC

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