Theoretical and Experimental Comparison Results of Dual-Channel 3D Quasi-Optical Network System between Frequency Selective Surface and Wire Grid Polarizer

Table 4

The far-field results of 324 GHz channel.

Filter	Angle (degree)		Cross-polarization level			First side-lobe of copolarization amplitude
		Simulation	Near-to-far	Far-field in CATR		Simulation	Near-to-far	Far-field in CATR
				Ideal QZ integral	Measurement			Ideal QZ integral	Measurement
FSS	Phi = 0	−32.01 dB	−14.44 dB	−16.78 dB	−11.64 dB	−53.08 dB	−39.08 dB	−27.09 dB	−22.67 dB
	Phi = 90	−62.66 dB	−15.04 dB	−15.53 dB	—	−58.96 dB	−38.86 dB	−32.32 dB	—
Polarizer	Phi = 0	−35.04 dB	−21.94 dB	−21.85 dB	−34.93 dB	−64.17 dB	−48.66 dB	−38.69 dB	−45.22 dB
	Phi = 90	−30.61 dB	−21.77 dB	−19.76 dB	—	−68.79 dB	−44.43 dB	−36.89 dB	—
Air	Phi = 0	−31.89 dB	−24.38 dB	−21.99 dB	−30.3 dB	−53.78 dB	−40.49 dB	−39.05 dB	−46.57 dB
	Phi = 90	−295.6 dB	−22.24 dB	−26.14 dB	—	−60.1 dB	−45.46 dB	−41.4 dB	—