A modular and efficient Gaussian beam (GB) analysis method, incorporating frame-based Gabor transformation, GB reflection,\nand a 3D GB diffraction technique, was developed to analyze both the reflectors and frequency selective surface (FSS) in quasioptical\n(QO) system. To validate this analysis method, a 3Ddual-channelQOsystem operating at 183 and 325GHz was designed and\ntested.The proposed QO system employs two-layer structure with a FSS of perforated hexagonal array transmitting the 325GHz\nsignal on the top layer while diverting the 183GHz signal to the bottom layer. Measured results of the system demonstrate that\nthe agreement can be achieved down to ?30 dB signal level for both channels in the far field pattern. The discrepancy between the\ncalculation and measurement is within 2 dB in the main beam region (2.5 times ?3 dB beamwidth), verifying the effectiveness and\naccuracy of the proposed method
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