Advanced Techniques for Low sidelobe level array antennas

This paper presents a review of novel methods in realizing the low sidelobe level array antennas. These methods highlight the concept of CSRR loading, inteferometry by end element loading, unequal spaced array, phase only synthesis for creating low sidelobe levels. In one of the approaches, Left hand media (LH) in the form of complementary split ring resonators (CSRRs) loaded array antennas is presented to achieve a sidelobe suppression of better than 10dB. In another approach, a synthesis technique of pattern interferometry in linear and planar arrays configurations is proposed, to exhibit control over the sidelobe suppression. Interferometry patterns are generated by loading one element each at the end of linear array. Alternatively genetic algorithms (GA) and its variations are used to create un-equal spacing between the antenna elements to create low sidelobe level array antennas. Multilayer planar array antennas are also proposed for sidelobe suppression and cross polarisation reduction.