A Method for Determining Optimal EBG Reflection Phase for Low Profile Dipole Antennas

An analytical method for determining the optimal reflection phase of an electromagnetic band gap (EBG) ground plane to match a low profile dipole antenna is introduced. Image theory is used to incorporate the near field coupling between a dipole antenna and the ground plane. The main contribution of...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2013-05, Vol.61 (5), p.2411-2417
Main Authors: McMichael, I. T., Zaghloul, A. I., Mirotznik, M. S.
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Dipole antennas
Electromagnetic band gap (EBG)
Exact sciences and technology
Impedance
low profile antenna
Metamaterials
Periodic structures
Radiocommunications
Reflection
reflection phase
Surface impedance
Surface waves
Telecommunications
Telecommunications and information theory
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Summary:An analytical method for determining the optimal reflection phase of an electromagnetic band gap (EBG) ground plane to match a low profile dipole antenna is introduced. Image theory is used to incorporate the near field coupling between a dipole antenna and the ground plane. The main contribution of this paper is to show that the optimal EBG reflection phase can be determined at discrete frequencies where a theoretically perfect return loss occurs. The optimal reflection phase is then obtained over a wider frequency band of interest and is related to the antenna's return loss for a given feed impedance and antenna height above the EBG. The resulting reflection phase can be used as a reference for designing an EBG ground plane that is well matched to the antenna without time consuming iterative full wave numerical simulations. Numerical modeling results are compared to the optimal return loss derived from the analytical method to validate the design process. It is also shown that, for certain antennas, vias are not always necessary in the construction of the EBG, which eases the manufacturing process. Finally, a dipole and EBG are constructed using the optimal design method and measurements are compared to the simulations.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2013.2244552