Analysis of different defect configurations in cebg structures for directive patterns
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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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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.


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


EBG structure

CEBG Structure


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


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


Solution 2Apply different defect configuration


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


Directivity vs. Frequency


Radiation Pattern

Horn

Defect 1


Radiation Pattern

Defect 2

Defect 3


Radiation Pattern

Defect 4

Defect 5


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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