Abstracts - Dipartimento di Elettronica Applicata
Abstracts - Dipartimento di Elettronica Applicata
Abstracts - Dipartimento di Elettronica Applicata
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Meta 2010 & FEM 2010 – Rome, 13-15 December 2010<br />
Parametric bandwidth analysis of an<br />
Artificial Magnetic Conductor surface<br />
D. Ramaccia, F. Bilotti and A.Toscano<br />
University RomaTre, Department of Applied Electronics<br />
Rome, Italy – E-mail: davide.ramaccia@gmail.com<br />
In this contribution we show a possible application of Finite Integral Technique for<br />
the parametric analysis of the bandwidth of an Artificial Magnetic Conductor (AMC)<br />
made by a perio<strong>di</strong>c array of metallic patches on a <strong>di</strong>electric grounded substrate. As is<br />
well know, these structures mimic the perfect magnetic conductor con<strong>di</strong>tion in a small<br />
frequency range [1-3].<br />
A typical AMC surface with square patches, its equivalent circuit representation are<br />
shown in Figure 1a and 1b respectively.<br />
a) b)<br />
Figure 1: HIS a) typical structure with square patches. b) equivalent circuit model.<br />
Consider an incident electromagnetic wave normally. If the surface is made by a<br />
Perfect electric conductor, the wave is reflected back with a 180 degree phase shift, so<br />
it is opposite in phase with respect to the incident one. If the surface is made by an<br />
AMC, the reflected wave is in phase with respect to the incident one. As mentioned<br />
before, this particular behavior is only in a small frequency range that is defined as the<br />
range within the phase shift is inside the interval [-90°;+90°].<br />
The geometric and electrical parameters of the structure allow us to mo<strong>di</strong>fy the values<br />
of the lumped elements and consequently the bandwidth of the structure as show in<br />
Fig. 2.<br />
Figure 2: Increased Bandwidth around 20 GHz for a AMC with perio<strong>di</strong>city D=7mm and substrate<br />
permittivity ε = 3 .<br />
References<br />
[1] O. Luukkonen et al., "Simple and Accurate Model of Planar Grids and High–Impedance Surfaces Comprising<br />
Metal Strips or Patches," IEEE Trans. Antennas Propag., 56, 1624–1632, 2008.<br />
[2] D. Sievenpiper et al., "High-Impedance Electromagnetic Surfaces with a Forbidden Frequency Band," IEEE<br />
Transaction Microwave Theory Tech., 47, 1999.<br />
[3] F.Costa et al., “On the Bandwidth of High-Impedance Frequency Selective Surfaces,” IEEE Antennas and<br />
Prop. Lett., 8, 2009.<br />
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