Experimental Verification of an Approximate Admittance Equation for Center-Fed Dipoles Arranged Parallel Beside Each Other and Estimation of Its Effective Frequency Range

A proposed approximate equation between admittance of a set of dipoles and that of the same set of dipoles with one removed is experimentally examined in the case of three or more elements using a multiport network analyzer. Experiment is performed for monopole arrays on a finite ground plate. It is shown that the equation is effective in the fractional band width of approximately 120 percent. The approximation error, validity of an introduced parameter α, and the size condition with which the approximation is effective are clarified.