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 />
Analytical Model of Connected Bi-Omega<br />
Structures for Enhanced Microwave<br />
Transmission<br />
Filiberto Bilotti, Luca Di Palma, and Lucio Vegni<br />
“Roma Tre” University, Department of Applied Electronics<br />
Rome, Italy – E-mail: bilotti@uniroma3.it<br />
In this contribution, we present a new analytical model of two connected biomega<br />
particles (Figure 1a). Exploiting the analytical models of chiral and<br />
planar omega particles [1-2] and the equivalent circuit of the bi-helix particle<br />
[3], we have developed a new analytical model for the isolated bi-omega<br />
particle (i.e. a single omega particle backed by its reversed replica). Assuming<br />
the particle electrically small, the proposed analytical model is given in terms<br />
of a proper lumped element equivalent circuit. Then, we have extended the<br />
model to the case of two connected bi-omega particles, by considering the<br />
relevant coupling terms. Since this structure is symmetric, it does support two<br />
fundamental modes, characterized by an even and an odd electric field<br />
<strong>di</strong>stribution, respectively. The analytical model, in fact, pre<strong>di</strong>cts two <strong>di</strong>fferent<br />
resonant frequencies related to the two modes of operation. Such a result is<br />
confirmed also by proper full-wave numerical simulations (Figure 1b). The<br />
proposed analytical model has been successfully used to design compact<br />
devices to obtain extraor<strong>di</strong>nary transmission through sub-wavelength apertures<br />
in metallic waveguides. This result opens the door to the design of a new class<br />
of microwave components (filters, impedance matching devices, mode<br />
converters, cavity resonators, miniaturized probes and ra<strong>di</strong>ating systems, etc.),<br />
some of which will be shown at the conference.<br />
55<br />
Magnetic field amplitude [A/m]<br />
25<br />
20<br />
15<br />
10<br />
5<br />
“even” mode<br />
“odd” mode<br />
0<br />
0 1 2 3 4 5<br />
Frequency [GHz]<br />
d) b)<br />
Figure 1 – a) Sketch of two connected bi-omega particles and b) its typical resonant behavior.<br />
References<br />
[1] S.A. Tretyakov, et al. “Analytical Antenna Model for Chiral Scatterers: Comparison with<br />
Numerical and Experimental Data,” IEEE Trans. Antennas Propagat., 44, 1006-1014,<br />
1996.<br />
[2] C.R. Simovski, S.A. Tretyakov, A.A. Sochava, “Antenna Model for Conductive Omega<br />
Particles,” J. Elettromag. Waves Applicat., 11, 1509-1530, 1997.<br />
[3] A.N. Lagarkova, et al. “Resonance Properties of Bi-helix Me<strong>di</strong>a at Microwaves,”<br />
Electromagnetics, 17, 213-237, 1997.