Performance analysis of biologically inspired coupled circular antenna array

We propose to design a small-size circular antenna array inspired by the female Ormia ochracea´s coupled ears and demonstrate its high direction of arrival (DOA) estimation performance. The female Ormia is able to locate male crickets´ calls accurately, for reproduction purposes, despite the small distance between its ears compared with the incoming wave-length. This phenomenon has been explained by the mechanical coupling between the Ormia´s ears, modeled by a pair of differential equations. In this paper, we first solve the differential equations governing the Ormia ochracea´s ear response, and convert the response to the pre-specified radio frequencies. Using the converted response, we implement the biologically inspired coupling as a multi-input multi-output filter on a uniform circular antenna array output, and compute the mean-square angular error bound on the 3-D localization accuracy. With numerical examples we demonstrate the advantages of the coupling effect.