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ContractTechnical Report • October 8th, 1999
in Fig. 4 for the normal incidence. The agreement is quite good. For the gridded-square array, over 20-dB attenuation is achieved at the second harmonic (4.9 GHz), and for the double-square array, over 10-dB attenuation are achieved at both the second (4.9 GHz) and third harmonics (7.35 GHz). The insertion loss at 2.45 GHz for both the gridded- and double-square arrays is less than 0.5 dB. The gridded- square array was also tested with a rectenna array. The efficiency of the rectenna decreases approximately 1% when the FSS is added, and the second-order harmonic (4.9 GHz) from the rectenna array is reduced approximately 10–15 dB, depending on the distance between the rectenna and FSS arrays. There are two ways to simultaneously suppress the second- and the third-order harmonics. One is to use two gridded-square arrays with their center frequencies at 4.9 and
