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Experimental evidence of phase resonances in a dual-period reection structure comprising three subwavelength grooves in each period is provided in the millimeter-wave regime. We have analyzed and measured the response of these structures and show that phase resonances are characterized by a minimum in the reected response, as predicted by numerical calculations. It is also shown that under oblique incidence these structures exhibit additional phase resonances not present for normal illumination because of the potentially permitted odd eld distribution. A satisfactory agreement between the experimental and numerical reectance curves is obtained. These results conrm the recent theoretical predictions of phase resonances in reection gratings in the millimeter-wave regime, and encourage research in this subject due to the multiple potential applications, such as frequency selective surfaces, backscattering reduction and complex-surface-wave-based sensing. In addition, it is underlined here that the response becomes much more complex than the mere innite analysis when one considers nite periodic structures as in the real experiment.

Millimeter-wave phase resonances in compound reﬂection gratings with subwavelength grooves