1. Quarter-wavelength antenna diagram TX-1 is the structural diagram of this antenna. This is a planar grounded antenna. This antenna consists of a vertically excited 1/4 wavelength vibrator. The vibrator and an artificial ground have The artificial ground consists of four horizontally placed radiation rods that are electrically grounded. The angle between the radiation rod and the ground is different, and the impedance presented by the antenna is also different. For example, the impedance is 34 when parallel to the ground plane. Europe: When it is 45 degrees from the ground plane, the impedance is 50 Europe. 
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