Abstract
In this paper, firstly, the theory of time-modulated array with non-uniform period modulation, named as non-uniform time modulated array (NTMA) where the antenna elements are modulated with different modulation frequencies has been examined. Then, it is investigated that, based on the selection of modulation frequencies, radiation of harmonic signals from such time-modulated array elements either can be spread in the space without overlapping with any other harmonic frequencies or can be accumulated in the space because of the radiation at the same frequency. Accordingly, the NTMA is classified into two categories as non-degenerate NTMA (ND-NTMA) and degenerate NTMA (D-NTMA) respectively. The expressions of total harmonic power losses for both ND-NTMA and D-NTMA have been derived. Through representative examples the harmonic power losses associated with different types of TMAs is calculated and their variations with inter-element spacing is presented.
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