Abstract
This paper has illustrated an optimization method for a shared aperture dual-band antenna array suitable for radar applications. A shared-aperture antenna array (SAA) has been formed using two different frequency band linear arrays. Both the linear arrays are designed on the underlying concept of the array thinning process. To design the transmitting thinned array having radiation characteristics identical to a uniformly fed periodic array, an optimization algorithm has been formulated using a genetic algorithm (GA). A feed signal is obtained to produce the desired peak sidelobe level (PSL) by employing this. In order to validate the proposed optimization technique, a prototype is fabricated using a Vivaldi antenna as the radiating elements for the C- and Ku-bands, respectively. The radiation characteristics of the fabricated array antennas are measured, and the performances of the prototypes are analyzed in terms of the half-power beamwidths (HPBW) and Gain.
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