摘要 : A current distribution along a wire antenna with some voltage at a port junction to a circuit is different from that with no port voltage. The different current distribution is 0 at the port, and is excited 90 degrees after the po... 展开 A current distribution along a wire antenna with some voltage at a port junction to a circuit is different from that with no port voltage. The different current distribution is 0 at the port, and is excited 90 degrees after the port voltage. The mechanism is thought that electrical charge move on each separated wire due to the electric field between the separated wires. The current intensity is calculated with parameters of a wire length, a wire width and a wire shape (whose width is not uniform) by means of a moment method, and the above consideration about the mechanism is confirmed. An approximate expression for the parameter α, which indicates the change of a vector effective length of a wire, by means of wire length and width. Then the influence of the current excited a port voltage to an input admittance is qualitatively studied. 收起