Antenna base
Now we will begin the study of the antenna. Suppose one day you walk in the street. Run a pleasant and patient person to you, and they ask you to design an antenna. "OK", you will soon reply. Then you ask, "What is the desired frequency, gain, bandwidth, impedance, and polarization?"
Perhaps you have never heard of the above parameters. If so, you come to the right place. , We can design an antenna, or to discuss the type of antenna, antenna, we must understand the basics. We now discuss the basic parameters of the characterization of the antenna.
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Now, we will learn something. We will begin with the frequency of the subject. Then we will discuss the radiation pattern, directivity and gain. Finally, we will explain why the antenna radiation completed.
Frequency
The basis of sinusoids (sine and cosine waves), wavelength, frequency and speed of light.
More advanced frequency information
How in the universe is the sum of all sinusoidal waveform (simple wave) discussion, which would explain why we always talk no matter what the wavelength and frequency of the waveform, we want to transfer.
Frequency band
No antenna fundamental discussion is incomplete band.
Radiation pattern
The antenna radiation pattern is on this page. We have a real three-dimensional graphics antenna radiation patterns, isotropic, and the directional radiation pattern of the full discussion. The antenna radiation pattern is very important concept.please Click hereto get our dipole antenna
Field region
Continue to discuss the antenna field region. Far-field, near field and the antenna Fresnel zone.
Directional
Directional antenna is an important concept. It is a measure of "directional" antenna radiation pattern is.
Efficiency and gain
Antenna efficiency is a lot of power radiated by the antenna relative to the antenna input power of measures. Then, we discuss the antenna gain. This is the power radiated in a particular direction.
Beam width and sidelobe
Antenna far-field radiation pattern is often characterized by the beam and sidelobe level.
Impedance
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Antenna impedance antenna terminal voltage than current. High and low frequency modes, proposed transmission line. Antenna impedance matching transmission line should be. If the antenna does not match a good antenna will not radiation. Introduced the concept of standing wave ratio. This is a measure of how well an antenna match.
Bandwidth
Antenna bandwidth, antenna radiation frequency range. Bandwidth can be defined in different ways.
Wave polarization
All electromagnetic waves associated with the polarization plane. Lines, arcs and elliptical polarization.
Antenna polarization
They also belong to the polarization of the antenna. This defines the type of plane polarized wave antenna is the most sensitive. This is a fundamental concept of the antenna.
Effective aperture
The concept of effective aperture antenna is a measure of power, captured by the antenna from a plane wave. Effective aperture can be expressed as a function of antenna gain and the wavelength of interest.
Frings transmission formula
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Frings transmission antenna theory, the formula is the most important equation. The received power equation and transmission power, antenna gain, distance, and wavelength. This page requires people who are interested in antenna theory.
Antenna temperature
Antenna temperature operating inch antenna and environmental attributes, it is a measure of the antenna due to thermal effects of noise.
Why is the antenna radiation?
In this page, we explain the production of wire and electronic flow of radiation physics concepts.
Antenna after learning the basics, the next step is to move the antenna list page, the basic types of antennas are discussed. You will find that the understanding of the concept for the understanding of the real antenna is essential.
