Spherical Near-Field Scanning With Higher-Order Probes
- Resource Type
- Periodical
- Authors
- Hansen, T. B.
- Source
- IEEE Transactions on Antennas and Propagation IEEE Trans. Antennas Propagat. Antennas and Propagation, IEEE Transactions on. 59(11):4049-4059 Nov, 2011
- Subject
- Fields, Waves and Electromagnetics
Aerospace
Transportation
Components, Circuits, Devices and Systems
Probes
Equations
Mathematical model
Fourier series
Iterative methods
Antenna measurements
Hafnium
antenna theory
- Language
- ISSN
- 0018-926X
1558-2221
A general method for higher-order probe correction in spherical scanning is obtained from a renormalized least-squares approach. The renormalization causes the normal matrix of the least-squares problem to closely resemble the identity matrix when most of the energy of the probe pattern resides in the first-order modes. The normal equation can be solved either with a linear iterative solver (leading to an iterative scheme), or with a Neumann series (leading to a direct scheme). The computation scheme can handle non-symmetric probes, requires only the output of two independent ports of a dual-polarized probe, and works for both $\phi$ and $\theta$ scans. The probe can be characterized either by a complex dipole model or by a standard spherical-wave representation. The theory is validated with experimental data.