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首页> 美国政府科技报告 >Experimental Spherical Near-Field Antenna Test Facility. Volume 8: Spherical Near-Field Measurements from a Compact-Range Viewpoint
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Experimental Spherical Near-Field Antenna Test Facility. Volume 8: Spherical Near-Field Measurements from a Compact-Range Viewpoint

机译：实验球面近场天线测试设备。第8卷：从紧凑范围的角度进行球面近场测量

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A procedure is described in which the local plane wave field required for measuring the far field antenna pattern is generated by an array of sources distributed over the surface of a sphere. The probe weighting factors used in spherical near field measurements, by reciprocity, may be used as excitations for a spherical array, and the results must be a plane wave field inside a central portion of the sphere. Any deviations from a perfect plane wave indicate measurement errors, on a basis independent of the antenna under test. A computer program has been written to calculate this plane wave field, and the SNIFTC program has been modified to provide the excitation factors. Several cases have been run showing that a virtually perfect plane wave field is achieved, confirming the theory and validating both programs. Phase deviations less than 0.04 deg and amplitude variations less than 0.003 dB have been found theoretically within a spherical quiet zone. Several cases have been run to evaluate the effects of truncating the array. It is shown that the size and the quality of the quiet zone is independent of the array radius for a full spherical array. For a truncated array the quiet zone becomes smaller when the array radius is decreased. Also very small arrays have been investigated and a case is treated where a 3 x 3 array at 1/3 of the Rayleigh distance produce a phase which is less than for a single element at the full Rayleigh distance.

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