Abstract

This paper presents a fully planar antenna based on a metamaterial consisting of a planar array of dogbones. The unit element of this high impedance surface (HIS) is composed of a layer with dogbone shaped conductors on top of a thin dielectric substrate backed by a metal ground plane. A HIS as an intermediate-gain antenna at C band is demonstrated. Previously, HISs have been employed in order to improve the radiation performance of antennas on top of them, this yields to low profile planar antenna applications. In this paper the idea is to eliminate the antenna above the HIS and instead use the HIS itself as an antenna. The direct use of a HIS as an antenna thus allows designing even thinner antennas. The leaky wave modes supported by this kind of metalayer have been previously demonstrated, and the main principle of this HIS antenna is the excitation of such modes in the finite array of dogbones to achieve broadside radiation. Various ways of exciting this antenna are explained and radiation patterns are given as simulation results. Also antennas in various sizes are compared with respect to the broadside gain.

Highlights

  • Artificial magnetic conductors (AMCs) are used in antenna applications to improve radiation performance [1]

  • High impedance surfaces (HISs) are an example of AMCs that are helpful in the search for low-profile planar antennas with increased broadside directivity

  • An electrically conductive plane can hinder thin planar antenna solutions by producing image currents that destructively interfere with the radiating currents on the antenna

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Summary

INTRODUCTION

Artificial magnetic conductors (AMCs) are used in antenna applications to improve radiation performance [1]. This paper proposes using a HIS structure itself as an antenna, rather than using the HIS to improve the radiation performance of other types of antennas This is because it has been observed in various simulations that a HIS exibits radiation phenomena. This proposed antenna, an AMC without a dipole on top, has an even lower profile than the dipole over an AMC, and can be fabricated by using only two metal layers: the ground and the patterned array structures on top. This antenna can be fed at various locations as shown in this paper. Even though for the sake of comparison the AMC considered here is exactly the same as that in [1], this antenna could be modeled as a transverse (leaky) transmission line with series capacitors

ANTENNA DESIGN
Feed Methods Utilized in Simulations
The Radiation Pattern and Gain of the HIS Antenna
CONCLUSIONS
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