Accurate Gain Measurement Technique for Limited Antenna Separations

Abstract

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Spherical mm-Wave Anechoic Chamber for Accurate Far-Field Radiation Pattern Measurements

“…Within the half-power beamwidth and at the first side-lobe level, the average difference between simulation and measurement is within 1 dB. A more stringent placement and alignment of the AUT (considering the phase center) [14] and, per embedded-element, should improve the accuracy of the individual measurements. Some of the embedded elements were measured off-center since the array had the same placement for each measurement.…”

“…This way the phase center of the AUT can be placed in the middle of the chamber. The variation of the phase center of the SGH across frequencies was presented in [14] and varies from 5 mm to 13 mm distance from the aperture.…”

“…Lastly, for both the Eand the H-plane the difference between simulation and measurement is greater for 40 GHz than for 26.5 GHz. It is expected that this is caused by the phase center of the antenna moving further away from the aperture for higher frequencies [14], while the antenna remains in the same position, causing a larger placement error for those frequencies (see Fig. 2(b) where the variation in phase center is illustrated).…”