Phase mode analysis of directional elements in a circular array
A technique for analyzing the directional elements of a circular array is presented. The technique is based on phase mode decomposition of measured element patterns. It can be used to calibrate the array and may help identify sources of measurement errors. It is illustrated with patterns from a 108-element circular array.
An interpolation technique for time-domain phased array measurements
A technique is presented for determining the insertion phase of phased array elements from time-domain spectra. It is shown that the inverse discrete Fourier transform (IDFT), commonly used in obtaining a time-domain spectrum, yields unreliable phase results. A phase compensation to the IDFT is proposed which allows the phase of an array element to be accurately determined without explicit time-gating and without taking a second DFT. The technique is applied to determine the element insertion phases of an L-band array.
Pattern synthesis of circular arrays with many directive elements
A method for synthesizing the radiation pattern of a circular array with directive elements is presented. The required excitations are determined from an explicit formula which requires no reduction or inversion of matrices. It is particularly useful for designing large circular arrays with many elements.