Equivalent circuits of dipole and periodic metal rod array

First, a method to obtain the equivalent circuit of a dipole consisting of frequency independent lumped elements is presented here. The input impedance of the equivalent circuit is in accordance with that of simulation results of the dipole. Then, based on the equivalent circuit of a single dipole, an equivalent circuit of one row periodic metal rod array is also developed. The passbands of periodic metal rod arrays calculated by the present method agree well with the simulation results and experimental measurements.