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A CONICAL HELIX ACTIVE RECEIVING ANTENNA FOR MULTI-FREQUENCY ELECTROMAGNETIC WAVE LOG

Liu Haibin;Chen Senxin;Kang Guojun(Changchun Univ.of Earth Sci.,Changchun 130026)  
An active receiving antenna consisting of conical helix antenna and a negative impedance changing circuit is analyzed in this paper.The stable operating condition and designed principle of the active receiving antenna are also given.The analysis shows that the active receiving antenna designed by this method has wider band and higher sensibility and small size.It is a better receiving antenna for multi-frequency electromagnetic wave log.
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