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Bandwidth, Efficiency and Directivity Enhancement of Printed Antenna Performance Using Planar Circularly Symmetric EBGs

Author: Llombart, N. · Neto, A. · Gerini, G. · Maagt, P. de
Publisher: EuMA
Place: Louvain-la-Neuve
Institution: TNO Defensie en Veiligheid
Source:8th European Microwave Week EUMW, 35th European Microwave Conference EuMC 2005, 3-4 October 2005, Paris, France, 3, 1859-1862
Identifier: 464614
Keywords: Bandwidth · Carrier communication · Dielectric materials · Surface waves · Dielectric slabs · Electromagnetic Band Gap (EBG) · Radiation patterns · Surface wave losses · Antennas


Planar Circularly Symmetric (PCS) Electromagnetic Band-Gap (EBG) substrates have been recently proposed to suppress the surface waves in printed technology [1] [2]. The major advantage of the PCS-EBGs with respect to structures based on vertical pins [3] [4] is the fabrication simplicity since the dielectric slabs do not need to be perforated. With respect to other planar type of EBG [5], an advantage is that the surface waves launched by a central source are reduced equally in all radial directions. The motivation of this contribution is to design and measure a prototype which demonstrates the suppression of surface waves by a PCS-EBG of a single antenna printed on a dielectric substrate. Thanks to the presence of the PCS-EBG around the antenna, we obtain an enhancement of the bandwidth, efficiency and directivity performances. The study will present some design considerations for the PCS-EBG itself, and then will proceed with the manufactured and measured antennas. The results explicitly show the advantages in terms of bandwidth and radiation pattern of the proposed EBG substrate. A bandwidth of 20% is achieved without significant surface wave losses.