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Archer, John
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article
A Millimeter-wave Antenna Amplitude and Phase Measurement System
Abstract
We describe the design and application of a system for measuring the amplitude and phase of antenna radiation patterns in the 182-194GHz frequency range. A heterodyne receiver comparing antenna and reference signals is designed from readily available components and incorporated into a 12m anechoic chamber. The chamber is used with or without a compact-range reflector for near- or far-field measurement of antennas up to 0.6m in diameter. The measured phase variation of the system, when idle, averages 0.3º over 227 seconds and 4.5º over 30 minutes.The amplitude stability is better than 0.15dB over a 63 hour period. Verification of the system is obtained by achieving excellent agreement between the calculated and measured radiation patterns of horn antennas. The system isused to characterize the amplitude and phase radiation patterns of a beam-scanning antenna for a 186GHz imaging system. The information is useful in testing the analysis of the antenna and also in analysis of algorithms used in the image formation process.