You can simply describe an antenna, or load an antenna description file someone else has created, click a Start button, and MMANA will calculate and plot the vertical and horizontal far field radiation patterns of the antenna for you.
The mathematical calculations required to perform far radiation field integrations are complex and laborious to do manually, but MMANA uses an improved faster and requiring less memory MININEC computation engine to do the work for you. However, those two examples are written in Japanese and are believed to be available only in Japan. Information about the moment method of far radiation field determination has appeared in Amateur Radio literature. The MININEC moment method of far field radiation calculation is a mathematical integration method based in principle upon the fundamental concept of summing fields from many small elemental sections of thin antenna conductors that compose an antenna system. Many excellent examples of both graphical and mathematical methods appeared in literature printed prior tofor example, F. Those field strength summations can be done by either graphical or mathematical integration. In adding the contributions to the total field that are made by the individual doublets that can be considered as making up the actual current distribution of an antenna it is necessary to take into account the phase and the plane of polarization of each contributing component field.
The radiation field produced by a transmitting antenna system having any known arbitrary current distribution can be found by adding the separate fields produced by elementary lengths of thin conductors with each elementary length treated as a very small radiating doublet antenna. It costs you nothing! Furthermore, even though it is outdated, its capabilities are adequate to model most antennas commonly used by amateurs. However, Version 3 has one big advantage compared to later versions.
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