The theory of electrically small antennas was established by Wheeler, Chu and Harrington, etc. They figured out that the quality factor of the antennas increases quickly, while the bandwidth and the efficiency descend with the decrease of the dimension of the antennas, and they get the basic restrictions for electrically small antennas. CFA, EH are special electrically small antennas, which are composed by a few coherent excited strong coupled radiators. It is indicated by lots of papers that these a...