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天线概念之Spherical Coordinates
2013-5-4 10:21
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- Understanding Spherical Coordinates is a must for the practicing antenna engineer. You are probably familiar with Cartesian Coordinates - a position (point P) c ...
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天线概念之Electric Flux Density (D-Field)
2013-5-4 10:20
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- The Electric Flux Density (usually written as the vector quantity D) is often used in electromagnetics. While we won't give it a rigorous definition here, it ca ...
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天线概念之Specific Absorption Rate (SAR)
2013-5-4 10:19
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- Specific Absorption Rate (or SAR) is a measure of how transmitted RF energy is absorbed by human tissue. SAR is a function of the electrical conductivity (, mea ...
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天线概念之Electric Field (E-Field)
2013-5-4 10:17
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- Electromagnetic waves are made up of Electric Fields (often called the E-field) and magnetic fields. What is an E-field?
Technically, the E-field at a point in ...
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天线概念之Effective Isotropic Sensitivity (EIS)
2013-5-4 10:16
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- EIS is the Effective Isotropic Sensitivity. In antenna measurements, the measured sensitivity in a single direction (that is, for a fixed and ) is known as the ...
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天线概念之S-Parameters
2013-5-4 10:14
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- S-parameters describe the input-output relationship between ports (or terminals) in an electrical system. For instance, if we have 2 ports (intelligently called ...
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天线概念之Effective Isotropic Radiated Power (EIRP)
2013-5-4 10:13
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- EIRP is Effective Isotropic Radiated Power, also called the Equivalent Isotropic Radiated Power. In antenna measurements, the measured radiated power in a singl ...
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天线概念之Resonant
2013-5-4 10:12
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- An antenna is said to be resonant if its input impedance is entirely real, i.e. Zin = R + j*0.
In this case the voltage and current are in phase at the antenna ...
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天线概念之E-plane
2013-5-4 10:11
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- The E-plane is any plane that contains the E-field and the direction of maximum radiation from the antenna. As an example, consider a short dipole, the electric ...
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天线概念之Reciprocity
2013-5-4 10:11
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- Reciprocity is one of the most useful (and fortunate) property of antennas. Reciprocity states that the receive and transmit properties of an antenna are identi ...
