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Analysis of Different Defect Configurations in CEBG Structures for Directive Patterns

Analysis of Different Defect Configurations in CEBG Structures for Directive Patterns. Arezou Edalati, Tayeb A. Denidni, and Halim Boutayeb INRS-EMT, University of Quebec, Montreal, Canada. CEBG principle. CEBG: Cylindrical electromagnetic band gap, Radially and circularly periodic,

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Analysis of Different Defect Configurations in CEBG Structures for Directive Patterns

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  1. Analysis of Different Defect Configurations in CEBGStructures for Directive Patterns Arezou Edalati, Tayeb A. Denidni, and Halim Boutayeb INRS-EMT, University of Quebec, Montreal, Canada.

  2. CEBG principle • CEBG: Cylindrical electromagnetic band gap, • Radially and circularly periodic, • Feed in the centre, • Present pass-band and stop-band to cylindrical EM wave, • applying a defect  reconfigurable directive pattern, • Defect can be create by using active element

  3. EBG structure CEBG Structure

  4. Lw w a Active components (ex.: Diodes) Reconfigurable EBG structure • Previous work: applying horn-shape defect for reconfigurable directive pattern • Advantage: 360 degree turning of the radiation pattern • draw back: need a lot of diodes (all the wires have to loaded with active element and more power supply CEBG antenna with horn-shape defect

  5. Solution1previous work • structure composed of discontinuous metallic wires, defects consisting of continuous wires. • Advantage: Reduction the power supply dc current by 75% • Drawback: Narrowband Number of diode is the same

  6. Solution 2Apply different defect configuration

  7. Directivity of different configuration • far-field proprieties are investigated through an examination of the two-dimensional directivity • Ez is the transverse component of the total electric field in the far filed region, calculated with the FDTD method

  8. Directivity vs. Frequency

  9. Radiation Pattern Horn Defect 1

  10. Radiation Pattern Defect 2 Defect 3

  11. Radiation Pattern Defect 4 Defect 5

  12. Conclusion • The best defect configuration is Defect1 in term of radiation pattern, directivity and band width • 60% reduction of active element and power supply compare to Horn configuration • They have almost the same band width

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