Gauss filter circuit equivalent model of antenna with characteristic modes approach

Based on Simplifying the antenna modes through the application of characteristic modes approach, we propose a novel method which synthesize the Gauss filter to design antenna equivalent circuit. We take the dipole antenna as an example to expound the method. Firstly, from the analysis of the characteristic modes approach, mode 1 and mode 3 are found to be the main radiation modes for a dipole antenna. And then, band pass filter equivalent circuits are designed in the light of the modal coefficient graph of each mode. Finally the two band pass filter equivalent circuits of mode 1 and mode 3 can be combined in parallel to be the equivalent circuit of the dipole antenna. The simulation results of the equivalent circuit are quite consistent with the original antenna for the bandwidth and impedance.