Equivalent circuits of compact monopole arrays based on scattering parameters

This paper focuses on the study of equivalent circuit models for compact antenna arrays. A method based on the conversion between the scattering matrix and the admittance matrix of the array is discussed, where the scattering matrix is obtained by numerical simulations or measurements. The results illustrate the coupling behavior of closely placed antennas and the circuit model can be used in the design of appropriate matching and decoupling networks for compact arrays. A two-element monopole array is investigated as an example.