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通讯频率
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  communication frequency
    With defer potential of harmonic fields in whole-space lossy medium, the closed expressions have been derived under quasi-static condition, which leads to analysis directivity of harmonic dipole antenna, field zones and relationships between field, earth resistivity, communication frequency and distance.
    本文利用全空间有耗媒质中谐变场的推迟位,在准静态条件下导出了电偶极子场的闭合解析公式,分析了谐变偶极子天线的方向性和场区以及无线通讯中场区与大地电阻率、通讯频率、通信距离等之间的关系。
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  communication frequency
HF detecting radar and communication frequency selection system
      
Most mothers reported having communicated with their home visitor about the three risk areas, but there were no differences in communication frequency based on whether services were needed.
      
Acoustic analysis shows that the optimal communication frequency is inversely proportional to about the 0.4 power of the animal's body mass.
      
For parallel programs, communication frequency, communication bandwidth and serialization complicate the situation further.
      
In other words, the communication frequency is high amongst neighbors and high overheads are far less tolerable.
      
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>=The wireless communication is one of important communications. Specially, other communications cease to be effective in suffering, wireless communication often becomes an only contact method in emergence. The dipole is used with underground communication device for transmitting and receiving. However, because of the earth that is a lossy medium, the fields by a dipole in underground communication differ from radio communication transmitting and receiving through the air. With defer potential of harmonic fields...

>=The wireless communication is one of important communications. Specially, other communications cease to be effective in suffering, wireless communication often becomes an only contact method in emergence. The dipole is used with underground communication device for transmitting and receiving. However, because of the earth that is a lossy medium, the fields by a dipole in underground communication differ from radio communication transmitting and receiving through the air. With defer potential of harmonic fields in whole-space lossy medium, the closed expressions have been derived under quasi-static condition, which leads to analysis directivity of harmonic dipole antenna, field zones and relationships between field, earth resistivity, communication frequency and distance. The results of underground experiment show that the wireless communication through a lossy medium is practicable. For some suitable cases, the communication distance is up to 880 m.

无线通信是地下工程如煤矿开采中重要的通信方式之一。特别是在灾害发生,其他通讯方式失效时,无线通信往往成为应急情况下唯一的联系方式。井下通信机采用偶极式发射与接收,但在有耗大地媒质中,使得井下通信的偶极场与通常经由空中发一收的无线电通信不同。本文利用全空间有耗媒质中谐变场的推迟位,在准静态条件下导出了电偶极子场的闭合解析公式,分析了谐变偶极子天线的方向性和场区以及无线通讯中场区与大地电阻率、通讯频率、通信距离等之间的关系。井下实验结果表明,有耗媒质中的电偶极源无缆通信是可行的,在适当的条件下,通信距离可达到880 m。

 
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