rank-1 ambiguity) problem associated with the polarization-angular coherence structure (PACS) of a tripole antenna by defining a new coordinate system where the two signals of concern both lie in the same coorainate plane, along with a theoretical demonstration indicating that the involved coordinate rotation has no effect on the study of the problem under consideration.

There are inherent contradictions among bandwidth, gain and miniaturization, on the basis of study on key technologies such as miniaturization and wide-band, the structure of circularly polarized antenna is innovated by digging a hole on medium board which solves contradictions among them.