Computer Reconstructed Holographic Technique for Phase-less Near-Field Measurement
Keywords:
Antenna measurements, hologram, near-field, phase-less measurementsAbstract
A novel holographic near-field phaseless technique is presented. The measurement system is composed of the antenna under test, the reference antenna, the amplitude scanning measurement system, and the holographic reconstructed algorithm. The interference amplitude of the antenna under test with the reference antenna is measured by the amplitude scanning system. The complex near field of the antenna under test is reconstructed by a computer, where the measured interference is corrected by the multiplication with the virtual spherical reference wave and then filtered in Fourier transformation domain (e.g., plane wave angular spectrum) or the back-projected image space. The reconstruction method is rigorous without traditional Fresnel approximation. The novel technique requires the amplitude on one measurement surface and the computer reconstructed algorithm, while the previous phase less technique depends on two measurement surfaces or extra hardware to provide synthesizedreference- wave. The novel measurement method and reconstruction algorithm could be used in many applications as for the planar near field measurement for example. Simulated results are presented to demonstrate the complex field retrieval method and near-field to far field transformation.
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