Application of the Planar-Scanning Technique to the Near-Field Dosimetry of Millimeter-Wave Radiators

作者：Zhao, Jianxun^*; Lu, Hongmin; Deng, Jun

来源：Bioelectromagnetics, 2015, 36(2): 108-117.

DOI：10.1002/bem.21889

• power density
• open-ended waveguide
• choke ring antenna
• electric field exposure

The planar-scanning technique was applied to the experimental measurement of the electric field and power flux density (PFD) in the exposure area close to the millimeter-wave (MMW) radiator. In the near-field region, the field and PFD were calculated from the plane-wave spectrum of the field sampled on a scan plane far from the radiator. The measurement resolution was improved by reducing the spatial interval between the field samples to a fraction of half the wavelength and implementing multiple iterations of the fast Fourier transform. With the reference to the results from the numerical calculation, an experimental evaluation of the planar-scanning measurement was made for a 50GHz radiator. Placing the probe 1 to 3 wavelengths from the aperture of the radiator, the direct measurement gave the near-field data with significant differences from the numerical results. The planar-scanning measurement placed the probe 9 wavelengths away from the aperture and effectively reduced the maximum and averaged differences in the near-field data by 70.6% and 65.5%, respectively. Applied to the dosimetry of an open-ended waveguide and a choke ring antenna for 60GHz exposure, the technique proved useful to the measurement of the PFD in the near-field exposure area of MMW radiators. Bioelectromagnetics. 36:108-117, 2015.

• 出版日期2015-2
• 单位西安电子科技大学