(2017) Ortiz Pérez de Eulate, Noelia; Falcone Lanas, Francisco; Sorolla Ayza, Mario; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
The present thesis deals with the design and practical implementation of novel netamaterial planar
antenna structures based on Complementary Split Ring Resonator (CSRR) particles.
As CSRR particles display a very attractive electrical performance when used as unit cell for
metasurfaces, the authors of this thesis have proposed to implement such particles in waveguide
lters. In this case, the possibility to design waveguide lters with lengths equal to the thickness
of a metallic sheet is con rmed. Consequently, the proposed structure constitutes a signi cant
reduction of the dimensions of the well-known resonant cavity waveguide lters coupled by irises.
The behavior of CSRR particles within compact waveguide lter suggested the authors to
use them as stand alone radiating elements. As expected, due to the reduced electrical volume of
CSRRs, such particles exhibited low radiation e ciency. In order to improve the radiation e ciency,
the idea to implement CSRRs inside a larger structure came to us. Measurement results con rm this
hypothesis and raise the question to design multi-band antennas. In order to implement multi-band
antennas, several CSRRs are inserted at di erent positions in the patch. It is then observed that the
grouping of CSRRs can provide either multi-band operation or polarization rotation capabilities,
when Electro-Inductive Waves (EIW) are supported.
Finally, thanks to EIW propagation, the idea to use longer CSRR chains as radiating structures
came to us. As an intermediate step, and in order to validate simulated results, a nite array
composed of nine CSRRs is manufactured and partially tested. Though partial, this test results are
very encouraging and motivate a more in deep measurement campaign. This campaign is expected
to result into new publications on this topic. These results support the use of the proposed CSRR
chains for the design of leaky wave antennas.
