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This paper describes a convenient method of polarization analysis for a circular multimode aperture antenna by decomposing the field distribution into two components called -polar. The new idea in this technique is the separation of the -polar for field expression into a rotationally symmetric magnitude function and an orientation function independent of the antenna off-axis. This leads to easily sketched figures of the multimode polarization patterns which give a clear physical picture on their effects and applications. Several examples are done in the context of the frequency reuse capabilities of earth-station antennas.