J. M. Fernández

Metallic wire substrate (MWS) for miniaturization in planar microwave applications

A novel metallic wire substrate (MWS) is proposed for miniaturized planar microwave circuits. This MWS consists of a dense array of vertical metallic wires embedded in a regular host substrate. It is demonstrated experimentally to exhibit magneto- dielectrics properties with simultaneously enhanced effective permittivity and permeability in a broad frequency range. Consequently, a substrate of higher effective refractive index is obtained, which allows size reduction in planar components and antennas. The extracted permittivity and permeability are about 5.5 and 1.7 (compared to the host substrate with epsivr = 2.94), respectively, from DC to 10 GHz.

Parallel plate waveguide with AMC-PEC-AMC strips

The aim of this paper is to demonstrate that it is possible to perform a waveguide using parallel plates and some metamaterial surfaces. The lack of lateral metallic walls in the waveguide is replaced by the effect of these metamaterials. An AMC-PEC-AMC structure is designed, simulated and prototyped. The advantage of this structure is due to the planar architecture and its low cost. In this paper, we use the structure described as if it were the feeding part of a planar slot antenna, in order to demonstrate the chance of using this structures in this antennas. Reflection and radiation pattern measurements are presented.

Metallic wire substrate (MWS) microstrip structure: Characterization and application to a patch antenna

This paper presents the characterization of the novel metallic wire substrate (MWS) introduced in [1] and its application to a microstrip patch antenna. It is shown numerically that the MWS exhibits artificial magneto-dielectric properties with simultaneously enhanced effective permittivity and permeability over a large frequency band. Consequently, due to the higher effective refractive index, the effective wavelength is reduced which implies reduction in the size of the elements printed on the MWS. First, the MWS microstrip line is analyzed and a procedure for its effective constitutive parameters (¿,¿) extraction is described and a parametric analysis is carried out to show the range of ¿, ¿ values achievable with typical substrates. Then, a patch antenna with reduced size is demonstrated, discussed in terms of efficiency, gain and compared to a homogeneous substrate.