The PO solution method is an asymptotic
high-frequency numerical method of the same nature as the UTD
but based on currents and not rays.
The PO solution method is formulated for use in instances
where electrically very large metallic or dielectric structures are modelled. Feko hybridises the current-based accurate MoM with PO including bidirectional
coupling between the MoM and PO regions. It discretises a PO
region, as it would for a MoM solution, making it a simple
task to switch between solution methods. In cases where the MoM part of the problem is electrically large, the PO
hybridised with the MLFMM provides an efficient solution.
A practical example for PO would be to calculate the effect
on the input impedance of a horn antenna (treated with the MoM) when placed near a large structure (treated with the PO).
Figure 1. PO modelling of a reflector antenna with MoM modelling of the feed.
