lec19_ebg design simulation 1_new

lec19_ebg design simulation 1_new - Design of...

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Design of Electromagnetic Bandgap (EBG) Structures Design of Electromagnetic Band Gap (EBG) Structures Notes

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Design of Electromagnetic Bandgap (EBG) Structures p2 w d l p1 a g1 g3 w g2 l w1 w2 g2 g1 w3 w1 w3 w2 Electromagnetic Bandgap (EBG) Structures 1. Unit cell is repeated to generate periodic pattern 2. This pattern has bandgap properties 3. Unit cell determines the Bandgap 4. Number of unit cells determine the isolation lvel
Design of Electromagnetic Bandgap (EBG) Structures Dispersion Diagram

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Design of Electromagnetic Bandgap (EBG) Structures What is Dispersion Diagram ? o Any transmission line structure has a transfer function associated with it. o The transfer function has magnitude and phase associated with it. o The phase is a function of the propagation constant (measured in pul). o For a loss less medium, the propagation constant is β =2 π/λ o Propagation constant varies with frequency β (f) o For a wave to propagate, β has to be finite at every frequency point o A plot of β Vs f is called as the dispersion diagram
Design of Electromagnetic Bandgap (EBG) Structures Dispersion Diagram for an EBG Structure Dispersion Diagram for an EBG Structure a p a p +a b mils mils Χ ΓΧ Μ 0 2 4 6 8 10 Frequency (GHz) Patch: 14 × 14mm Branch: 1 × 1mm (located at the corner of patch) Dielectric thickness: 0.3mm Μ Γ Χ Γ Propagation Constant Assumes infinite periodicity

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