Abstract
This project will focus on the estimation of gain, beamwidth and sidelobe levels of linear and concentric ring antenna arrays over the wide range of frequency band of 1-20GHz. The potential applications of the current wideband array design will be in radio astronomy and Ultra Wideband (UWB) wireless applications. In the project, bandwidth performance is achieved by altering the inter-element spacing of a default equally spaced array. This approach is based on a proven theory that a uniformly spaced antenna array is resonant at a single center frequency, while the introduction of unequal spacing expands the working bandwidth of the system. The system design in this work is a two-stage process: the first part is to obtain the unequally spaced design from a default uniform array, and the second part is to estimate the Gain, beamwidth and sidelobe levels for non-uniform array over the frequency range of 1-20GHz and compared the performance improvement over uniform antenna arrays. In this work, both linear and concentric ring arrays have been designed, and significant increase in performance bandwidth has been achieved, as compared to the default uniform arrays.