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A free-standing wire grid polarizer with 25μm diameter Tungsten wire, 100μm wire spacing and 170×170mm aperture area is designed and fabricated. The power transmission and reflection coefficients are measured at 45° oblique incidence within the frequency range of (183.3°16) GHz, and compared to the simulation results and theoretical calculation results. With consistency among the measurement, simulation...
RF and microwave networks are often characterized using scattering or S-parameters. The S-parameters of a network provide a clear physical interpretation of the transmission and reflection performance of devices. Vector-network-analyzer can measure S-parameters rapidly with a great accuracy. When a calibration has been performed, we need to use verification kits to check the performance of the VNA...
This paper describes the development of a waveguide radiometer to measure noise from millimeter wave electronic components from 75 GHz to 110 GHz. The radiometer will estimate the noise temperature of a device under test (DUT) based on comparison with room temperature and 77K noise standards. This is a standard physical approach in other NIST microwave radiometers. The radiometer is particularly amenable...
The free-space measurement system operating in 8GHz∼40GHz frequency range consists of two X-band ripples horn single-lens antennas, waveguide transmission segment, fixture, a mounting station, an Agilent N5225A network analyzer and a computer. A dual calibration technique of SOLT and GRL is used to eliminate errors due to multiple reflections via the surface of the sample. The complex permittivity...
This paper presents an accurate millimeter-wave attenuation measurement system in 140GHz-220GHz range. Based on the intermediate-frequency (IF) series substitution method, this measurement system employs an inductive voltage divider (IVD) working at 10 kHz as a reference standard. By stabilizing the IF measurement signal with a new reference signal generating technique, the system can get a pretty...
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