brief introduction： According to the antenna theory, the dipole antenna is a balanced antenna, while the coaxial cable is unbalanced Transmission, if it is directly connected, the coaxial cable skin has high frequency current flow (according to the transmission principle of coaxial cable, high frequency current should flow in the cable, the skin is a shielding layer, there is no current) This, in turn, affects the radiation from the antenna (think of the shielding of the cable as being involved in the radiation o

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