Linear Antenna-Array with Log-increasing Inter-element Spacing and Non Uniform Weights

In this paper, linear antenna-array with logarithmically increasing inter-element spacing and non-uniform excitation amplitudes or weights has been investigated for beamwidth (BW), side lobe level (SLL) and directivity (D). This non-uniform linear array has been compared with uniform and non-uniform linear arrays, employing uniform and non-uniform weights, proposed in literature. Conventionally, non-uniform weighting techniques such as binomial, Dolph-Chebhychev, etc. have been applied to suppress side lobes at the cost of increased beamwidth. In this paper, we have shown that applying non-uniform weights to the proposed non-uniform linear array, SLL can be suppressed without compromising beamwidth, resulting in increased directivity. The proposed array has been compared with other linear array geometries and weighting schemes in terms of beamwidth, peak side lobe level (PSLL) and directivity.