Disclosed is a method of optimizing a design to be formed on a substrate. An algorithm is machine-trained to detect fetal anatomy. At least one ground post is also provided, extending away from the inner surface of the first filter housing member and having at least a first portion with an outer dimension that is greater than an inner diameter of the at least one plated ground hole. The dimensions of the insulating substrate are different from the dimensions of the electrically conductive sealing surface to reduce thermal spread to adjacent tissue structures. All embodiments maintain a process to absorb excess microwave energy.