Maxwellian circuit models for analysis of printed spiral antennas

In this letter, it is the first time to implement the theory of Maxwellian circuits (TMC) to the printed spiral antennas. First, the Maxwellian circuit models (MCM) for the printed spiral antennas are established through two independent sets of full-wave solutions of current and scalar potential distributions. In this stage, a relationship between the scalar potential and voltage is proposed to satisfy Ohm's law at the terminals of the antennas. Second, broadband MCM are developed to predict the characteristics of the antennas over a quite wide band by using the information at only three sampling frequencies. Numerical results indicate that solutions of the MCM (sparse matrix system) are much more efficient than those of the conventional integral equation solutions (full matrix system) without any accuracy sacrifice.