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天线基础之Friis传输方程The Friis Equation
2013-5-3 14:06
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- On this page, we introduce one of the most fundamental equations in antenna theory, the Friis Transmission Equation. The Friis Transmission Equation is used to ...
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天线基础之口径效率Effective Area (Effective Aperture)
2013-5-3 14:04
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- A useful parameter calculating the receive power of an antenna is the effective area or effective aperture. Assume that a plane wave with the same polarization ...
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天线基础之极化Polarization - EM Waves and Antennas
2013-5-3 14:01
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- Polarization of Plane Waves
Polarization (or Polarisation for our British friends) is one of the fundamental characteristics of any antenna. First we'll need t ...
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天线基础之带宽Bandwidth
2013-5-3 13:58
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- Bandwidth is another fundamental antenna parameter. Bandwidth describes the range of frequencies over which the antenna can properly radiate or receive energy. ...
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天线基础之阻抗Antenna Impedance
2013-5-3 13:56
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- Antenna impedance relates the voltage to the current at the input to the antenna. This is extremely important as we will see.
Let's say an antenna has an imp ...
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天线基础之波束宽度和副瓣电平Beamwidths and Sidelobe Levels
2013-5-3 13:54
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- In addition to directivity, the radiation patterns of antennas are also characterized by their beamwidths and sidelobe levels (if applicable).
These concepts ...
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天线基础之效率和增益 Antenna Efficiency and Antenna Gain
2013-5-3 13:53
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- On this page, we'll introduce two fundamental antenna parameters: antenna efficiency and antenna gain.
Antenna Efficiency
The efficiency of an antenna relate ...
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天线基础之方向性antenna basic-Directivity
2013-5-3 13:49
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- Directivity is a fundamental antenna parameter. It is a measure of how 'directional' an antenna's radiation pattern is. An antenna that radiates equally in all ...
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天线基础之场区域 antenna basic-Field Regions
2013-5-3 13:42
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- The fields surrounding an antenna are divided into 3 principle regions:
Reactive Near Field
Radiating Near Field or Fresnel Region
Far Field or Fraunhofer Re ...
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天线基础之辐射方向图 antenna basic-Radiation Pattern
2013-5-3 13:40
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- A radiation pattern defines the variation of the power radiated by an antenna as a function of the direction away from the antenna. This power variation as a fu ...
