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On the optimal radiation bandwidth of printed slot antennas surrounded by EBGs

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4 Author(s)
Neto, A. ; Defence, Security & Safety Inst., Den Haag, Netherlands ; Llombart, N. ; Gerini, G. ; de Maagt, P.

This paper describes a design strategy to achieve the maximum bandwidth and efficiency for a printed slot antenna surrounded by EBGs. First the dielectric constant and the thickness of the dielectric slab that guarantees an acceptable front to back radiation ratio is identified. Then electromagnetic bandgap (EBG) structures are designed to achieve the optimal bandwidth (BW) while obtaining high surface wave efficiency in the radiating half space. To achieve this goal the wave interaction between the slot and the EBG structures is investigated in depth and clearly described. For the case of Planar circularly symmetric (PCS) EBGs the maximum of radiation BW is shown to occur when the distance between the central antenna and the EBG is approximately half wavelength of the first surface wave, λsw/2.

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Antennas and Propagation, IEEE Transactions on  (Volume:54 ,  Issue: 4 )