天线概念之Spherical Coordinates
天线概念之Spherical Coordinates

2013-5-4 10:21 今日头条 457 0

Understanding Spherical Coordinates is a must for the practicing antenna engineer. You are probably familiar with Cartesian Coordinates - a position (point P) c ...
天线概念之Electric Flux Density (D-Field)
天线概念之Electric Flux Density (D-Field)

2013-5-4 10:20 今日头条 325 0

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 ...
天线概念之Specific Absorption Rate (SAR)
天线概念之Specific Absorption Rate (SAR)

2013-5-4 10:19 今日头条 292 0

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 ...
天线概念之Electric Field (E-Field)
天线概念之Electric Field (E-Field)

2013-5-4 10:17 今日头条 388 0

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 ...
天线概念之Effective Isotropic Sensitivity (EIS)
天线概念之Effective Isotropic Sensitivity (EIS)

2013-5-4 10:16 今日头条 1313 0

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 ...
天线概念之S-Parameters
天线概念之S-Parameters

2013-5-4 10:14 今日头条 337 0

S-parameters describe the input-output relationship between ports (or terminals) in an electrical system. For instance, if we have 2 ports (intelligently called ...
天线概念之Effective Isotropic Radiated Power (EIRP)
天线概念之Effective Isotropic Radiated Power (EIRP)

2013-5-4 10:13 今日头条 656 0

EIRP is Effective Isotropic Radiated Power, also called the Equivalent Isotropic Radiated Power. In antenna measurements, the measured radiated power in a singl ...
天线概念之Resonant
天线概念之Resonant

2013-5-4 10:12 今日头条 269 0

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 ...
天线概念之E-plane
天线概念之E-plane

2013-5-4 10:11 今日头条 314 0

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 ...
天线概念之Reciprocity
天线概念之Reciprocity

2013-5-4 10:11 今日头条 428 0

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 ...
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