Patent ID: 11879924
Assignee: KEYSIGHT TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. The method of claim 16, wherein a first near-field distance of the plurality of near-field distances of the probe antenna for determining the actual offset of the array phase center is equal to d1, and wherein a value of d1 is determined by:
combining Equation (1) and Equation (2) to provide:

EIS(df)=EIS(d1)−adf−1+ad1−1  Equation (3), wherein a and d1 are unknown parameters;
performing measurements of the EIS at a second near-field distance (d2) and a third near-field distance (d3) to obtain measured EIS (d2) and measured EIS (d3), wherein the second near-field distance (d2) equals the first near-field distance (d1) plus a known first interval (Δd1), and the third near-field distance (d3) equals the second near-field distance (d2) plus a known second interval (Δd2), wherein the EIS (df) is also expressed as:

EISP(df)=EIS(d1+Δd1)−adf−1+a(d1+Δd1)−1  Equation (4)

EIS(df)=EIS(d1+Δd2)−adf−1+a(d1+Δd2)−1  Equation (5)

solving Equations (3), (4) and (5) to derive unknown parameters a and d1, as well as the EIS (df).