Dual-band radiator interactions in rectangular and triangular grids are analyzed. The frequency ratio between the individual sub-bands of operation is 1.86:1. Performance comparison is essentially based on the coupling between adjacent elements and detuning levels of the radiators in array configuration. Results provide essential insights to understand the radiator's coupling behaviour, especially when the bands of operation are separated by a substantial frequency gap. The analysis is also important for providing wide scan performance at both bands of operation, as there is a direct correlation between the coupling and the scan behaviour of the array.
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