Measurement of frequency-selective surfaces with optoelectronically generated microwave transients

The complex transmission functions (amplitude and phase) of frequency selective surfaces were measured using optoelectrically generated broadband microwave transients. The amplitude and phase of the transmission function of an array of cross dipoles with a=462 mu m, b=214 mu m, and g=1770 mu m are shown. The corresponding results of a sample with a=927 mu m, b=422 mu m, and g=3551 mu m are shown. The amplitude spectra clearly indicate that the samples are indeed band-stop filters, and the corresponding phase spectra follow the predictions of the Kramers-Kronig relations. The results of the measurement are in good agreement with the predictions of full-wave electromagnetic simulation.<>