Mutual coupling between IFF/SSR microstrip antennas is investigated experimentally in this paper. At the begining configuration and performance of isolated microstrip antenna fed by H-shaped coupling slot is presented. Next, the vertical and horizontal arrangement of the microstrip antennas array were investigated. The measurements of return loss and coupling coefficients at two operating frequencies for the two orthogonal planes are presented and compared with the results of numerical calculations, showing satisfactory agreement.
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