Physically flat but electromagnetic parabolic surface using EBG structure with stepped reflection phase

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 4Language: englishTyp: PDF

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Chang, Kihun; Ahn, Jihwan; Yoon, Young Joong (Department of Electrical and Electronic Engineering, Yonsei University, 134 Shinchondong, Seoul, 120-749 Korea)

Physically flat but electromagnetic parabolic surface (EPS) is presented. By covering a metal ground plane with periodic metal-dielectric composite textures, the electromagnetic reflection properties can be altered. By tuning the individual lattice of a periodic mushroom-type texture to vary the surface impedance, an EBG surface with a stepped reflection phase as a function of position can be designed. Using a parabolic phase gradient in the reflection coefficient along the face, the surface can be a concave curve inwards in the middle and concentrate a reflected wave. With this technique, an electromagnetic gradient surface on a geometrically flat structure with novel reflection properties can be created. This paper introduces a one-dimensional EPS structure and discusses the reflected beam focusing.