Medium frequencies and horizontal magnetic dipoles (vertical loop antennas) can be used in underground radio communication in mining sections of coal mines.
中频频率和水平磁偶极子天线(垂直环状天线)是井下采区无线通信可使用的频段和天线型式。
On the pulse frequency encoding of the antennas, the thesis provided the feedback units using multi closed loop delay circuit.
在光学天线频率编码分析中,本文提出了利用多光纤环级联代替单光纤环作反馈单元实现频率编码的思想。
On the pulse frequency encoding of the antennas, the thesis provided the feedback units using multi closed loop delay circuit.
在光学天线频率编码分析中,本文提出了利用多光纤环级联代替单光纤环作反馈单元实现频率编码的思想。
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