Linear phased array of coaxially-fed monopole elements in a parallel plate guide

Performance of a coaxially-fed monopole element in an infinite linear phased array radiating into a semi-infinite parallel plate guide is analyzed. Relations for the active admittance and element pattern are obtained. These expressions are required in the design of low sidelobe Rotman lens with probe elements. Numerical results based on theoretical analysis are presented. Comparison with experimental data will be given.