Experimental demonstration of deflection angle tuning in diffraction-inspired unidirectional structures

P. Rodriguez-Ulibarri, V. Pacheco-Peña, F. Falcone, Miguel Navarro-Cia, A. E. Serebryannikov, M. Beruete

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Direction selective transmission regimes obtainable in the framework of the
Lorentz reciprocity have lately attracted scientist community attention. Unlike
nonreciprocal structures, reciprocal ones are eminently passive and generally
much simpler. Enabling direction selective regimes with reciprocal structures
requires breaking the spatial inversion symmetry. With this aim in view, different
strategies have been proposed, such as higher diffraction orders excitation,
polarization conversion, and bending transmission channels in prism-like
configurations. Here, the first approach is implemented for a fishnet metamaterial loaded with a dielectric grating. It is shown that a very compact volumetric device can be designed while maintaining direction selectivity features.
Direction selectivity is experimentally demonstrated here at the V-band of the
millimeter-wave range. Beyond this, tuning and eventually sign-switching of the
output deflection angle is obtained by varying the frequency and/or angle of
incidence. To this end, an ABmmTM vector network analyzer has been used
together with a turning platform and a rotating positioner for monitoring both
incidence and deflection angle. Forward (grating side illumination) and backward
(non-grating side illumination) transmission results at 65 GHz and different
output deflection angles (θout = -10, -5, 0, 5 and 10 deg) are shown in Fig. 1. A
clear forward-to-backward transmission contrast can be noticed. At the same time, tuning of the output deflection angle is achieved by sweeping the incidence angle.
Original languageEnglish
Title of host publicationRadio Science Meeting (Joint with AP-S Symposium), 2015 USNC-URSI
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages1
Publication statusPublished - 2015


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