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对于井下中频便携式发射机所使用的天线,不能使用评价地面上天线性能的指标来评价其性能。通过对鞭状天线和环状天线的比较指出:鞭状天线不适宜于井下中频便携式发射机,而环状天线则是井下中频便携式发射机可使用的较好的天线型式。
For antennas used in downhole IF portable transmitters, you should not use an indicator that evaluates the performance of the antenna on the ground to evaluate its performance. The comparison between whip antenna and loop antenna shows that the whip antenna is not suitable for the downhole IF portable transmitter, while the loop antenna is a good antenna type that the downhole IF portable transmitter can use.