Radiation Impedance Calculation for Arbitrarily Shaped Piston

A general solution for determining self- and mutual-radiation impedances for rectangular radiators is presented in a closed form with a double integral. Using this solution, an efficient calculation method is developed for the radiation impedance of an arbitrarily shaped piston in a rigid infinite baffle. The proposed algorithm is verified by its agreement with previously published results for square pistons. Its utility is demonstrated with an example of radiation impedance of a circular piston.