地下钻杆透层天线

THE UNDERGROUND PENETRATING DRILL ROD ANTENNA

对于有耗分层媒质中的垂直透层天线，建立了Ｈａｌｌｅｎ积分方程分析法的一般理论以及求取地面电场和电压的计算方法．作为应用实例，给出了地下３层媒质中钻杆天线上的电流积分方程，并对典型的地质参数进行了数值计算．所得结果和结论，与已知的理论结果和实验规律吻合。

This paper is concerned with the theory of the underground penetrating antennas.The general method to set up the Hallen-type integral epuations for the dirll rod natenna and the formulas to compute field strength and voltages on the ground surface are presented.As a typical application,the Hallen integral eqnations for the drilling antenna used in the MWD systems are given in the nudeground three-layered media.The numerical computations using typical data for the model are carried out.Some beneficial results are obtained,which are coincide with the regularly from other theory and experiments.