Authors: Ahmed A. Kishk
Source: FERMAT, Volume 4, Article 1, Jul-Aug., 2014
Abstract: A simple and efficient procedure is proposed to predict the performance of large finite arrays from the measurements of a small array of similar lattice. The procedure depends on the knowledge of the mutual admittance matrix of the small array from which the mutual admittance matrix of the larger array is constructed by ignoring the mutual coupling between the elements that are external to the domain of the small array. Once the admittance matrix has been constructed for the large array, active input impedances of the array elements under different scenarios can be predicted easily. Also, from the active voltage terminal of the elements, an array factor including the mutual coupling can be computed to predict the radiation patterns as well as the array gain. Here, an air microstrip patch antenna excited by a hook-shaped probe is considered as an array element. The results obtained using the present method is verified by the full-wave numerical analysis of the large array. The results obtained serve to verify the concept.
Index Terms: Finite Array, Large Array, Microstrip Antenna, Phased Array.
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Design of Large Finite Arrays Using Simulations or Measurements of Small Arrays