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天线的输入导纳定义为馈电点电流与馈电电压之比。如果线状天线的长度小于天线表面上的电磁波波长,称为电短天线;工作在谐振状态(输入电抗为零)的天线称为谐振天线。利用电短天线和谐振天线的输入导纳,可以确定出媒质的相对介电常数和损耗角正切,并由介电常数和损耗角正切换算出电导率。因此,可利用电天线来研究钻孔剖面的
The input admittance of the antenna is defined as the ratio of the feed point current to the feed voltage. If the length of the linear antenna is shorter than the wavelength of the electromagnetic wave on the antenna surface, it is called an electrical short antenna; the antenna operating in a resonant state (input impedance is zero) is called a resonant antenna. Using the input admittance of the short antenna and the resonant antenna, the relative permittivity and loss tangent of the medium can be determined, and the conductivity can be calculated by the positive dielectric constant and loss angle switching. Therefore, the electrical antenna can be used to study the borehole profile