Comparison of circular, Uniform- and non Uniform Y-Shaped Array Antenna for DOA Estimation using Music Algorithm

For accurate estimation of AOA of multiple sources an antenna array can be used. In this paper a comparison between the directions finding capability of three array geometries circular array, uniform- and non-uniform Y-shaped array are presented. The center frequency is 2.25 GHz with a bandwidth of 100 MHz. The antenna element is the skirt monopole. The antenna array performance is severely affected by the mutual coupling (MC). The direction finding capabilities of the music algorithm for three arrays is then analyzed using the data with- and without MC. It is concluded that the circular array outperformed the other two array configurations. The performance of the circular array is then evaluated in noisy environment. A method to calibrate the algorithm for MC is presented. The performance of the algorithms is evaluated for different number of sources, and SNR